2.1 Physical Characteristics

• Appearance and Form: Available in liquid and solid forms. The liquid product is a colorless to pale yellow transparent liquid, free of turbidity and precipitation; the solid product is a white crystalline powder, free of caking and obvious impurities, with good fluidity (solid products shall be stored in a sealed and moisture-proof manner).
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• Solubility: Highly soluble in water with a fast dissolution rate, unaffected by water temperature (can dissolve rapidly from room temperature to 60℃). It forms a uniform and transparent aqueous solution without precipitation or layering after dissolution. It is insoluble in organic solvents such as ethanol, acetone and benzene, and miscible with water in any proportion.
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• Density: The density of the liquid product (solid content 20%-50%) is 1.05-1.15g/cm³ at 25℃; the bulk density of the solid product is 0.80-1.00g/cm³.
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• Viscosity: The viscosity of the liquid product (solid content 30%) is 500-5000 mPa·s (measured with an NDJ-1 rotary viscometer at 25℃). Viscosity increases with rising molecular weight and solid content and can be adjusted according to application requirements.
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• Stability: It exhibits extremely high stability under normal temperature and pressure, is not prone to decomposition or deterioration, and has excellent acid resistance, alkali resistance and salt resistance, maintaining stable performance within a pH range of 2.0 to 11.0. Avoid environments with high temperatures (above 80℃), strong sunlight exposure and strong oxidants; its performance remains stable during storage.
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• Safety: Non-toxic, odorless and non-irritating, it is not classified as a dangerous substance. It has no obvious irritation to human skin and mucous membranes, is easy to operate, and requires no special protection (just rinse with clean water after direct contact). It complies with environmental protection and safe use standards.
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2.2 Chemical Characteristics

• Core Ingredients: Polydimethyldiallylammonium chloride, monomer residue ≤ 0.1% (industrial grade), ≤ 0.05% (food grade), no other harmful impurities.
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• Charge Density: The cationic charge density is high, typically 3.0-6.0 meq/g with uniform charge distribution. It exhibits strong adsorption capacity and can rapidly neutralize negatively charged colloids and particles in water.
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• Molecular weight: It has a wide customizable range, including low molecular weight (10000-100000), medium molecular weight (100000-500000), and high molecular weight (500000-1000000). Products with different molecular weights are suitable for different scenarios and can be adjusted flexibly.
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• Chemical Stability: It features excellent chemical stability, is resistant to hydrolysis and oxidation reactions, and has good compatibility with other agents (such as PAC, PAM, bactericides, etc.). It can be used in combination to improve treatment efficiency.
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• Adsorption mechanism: The quaternary ammonium salt groups in the molecular structure carry positive charges, which can destabilize negatively charged colloidal particles in water through charge neutralization. Meanwhile, fine particles are aggregated into large flocs via adsorption bridging, enabling rapid sedimentation or filtration separation. In addition, it can adsorb organic matter, heavy metal ions and microorganisms in water, achieving the auxiliary effects of water purification, sterilization and disinfection.

2.3 Product Advantages

• High-Efficiency Flocculation: With a high cationic charge density, it features fast flocculation, large and compact flocs, and rapid sedimentation. Compared with traditional cationic flocculants, the treatment efficiency is improved by more than 40%, which can significantly shorten the treatment cycle.
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• Wide application range: It adapts to a broad pH range (2.0-11.0), and has excellent treatment effects on low-temperature, low-turbidity, high-turbidity, high-salinity, and oily wastewater, making it suitable for various water quality scenarios.
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• Versatility: It integrates multiple functions including flocculation, conditioning, decolorization, sterilization, and demulsification. It can not only remove suspended solids and colloids from water but also eliminate part of the organic matter, chromaticity, and microorganisms, without the need for additional multiple chemicals.
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• Environmentally friendly and non-toxic: No secondary pollution, no harmful residues after use, and the treated water quality complies with relevant discharge standards. It can be used in scenarios with high environmental requirements such as drinking water pretreatment and food processing.
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• Good compatibility: It can be used in combination with commonly used water treatment agents such as PAC, PAM, and polymeric ferric sulfate to achieve synergistic effects and reduce treatment costs. It also has excellent compatibility with other surfactants and bactericides without adverse reactions.
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• Easy to operate: Liquid products can be directly diluted and added, while solid products dissolve quickly without complex pretreatment. They are compatible with existing equipment, reducing operational difficulty and labor costs.
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• Highly customizable: Products with different molecular weights, solid contents, and charge densities can be tailored to meet customer requirements, precisely matching the application needs of various industries and scenarios.

• III. Product Specifications and Parameters

  This product is available in both liquid and solid forms, and comes in two grades: industrial grade and food grade. Its core specifications and parameters strictly comply with industry standards and internal enterprise control standards, and can be customized and adjusted according to customer requirements. The specific parameters are shown in the table below:

  
  

  Parameter Name	Unit	Industrial Grade (Liquid)	Industrial Grade (Solid)	Food Grade (Liquid)	Test method
  Solid content	%	20.0-50.0 (Customizable)	≥90.0	30.0-40.0	Drying-weighing method
  Molecular weight	-	10⁴-10⁶ (customizable)	10⁴-10⁶ (Customizable)	10⁴-5×10⁵	Ubbelohde viscometer method
  charge density	meq/g	3.0-6.0	4.0-6.0	4.5-5.5	potentiometric titration
  Residual monomer content (DMDAAC)	%	≤0.1	≤0.08	≤0.05	High Performance Liquid Chromatography (HPLC)
  pH value (1% aqueous solution)	-	2.0-7.0	3.0-7.0	4.0-6.0	Determined by pH meter (25℃)
  Viscosity (25℃)	mPa·s	500-5000 (solid content 30%)	-	800-3000 (solid content 35%)	Rotational viscometer method
  Density (25℃)	g/cm³	1.05-1.15	0.80-1.00 (bulk density)	1.08-1.12	Determined by hydrometer
  Heavy metals (calculated as Pb)	mg/kg	≤10	≤5	≤2	Atomic Absorption Spectrophotometry
  Arsenic (As)	mg/kg	≤2	≤1	≤0.5	Atomic Fluorescence Spectrometry
  Total bacterial count	CFU/g（mL）	≤1000	≤500	≤100	Plate count method
  Shelf life	months	12 (sealed and stored in a cool place)	24 (sealed and moisture-proof storage)	12 (sealed and stored in a cool and dark place)	Storage observation at room temperature

  IV. Product Quality Standards

  4.1 Implementation Standards

  This product of polydiallyldimethylammonium chloride (PDADMAC) strictly complies with the following national and industrial standards to ensure qualified product quality, safety and reliability, and meets the application requirements of various industries.

  
  

  • Industrial-grade product: Complies with Water Treatment Chemicals—Polydiallyldimethylammonium Chloride (GB/T 31246-2014). This standard clearly specifies the indicators, testing methods, inspection rules, packaging, and transportation of industrial-grade PDADMAC, and is applicable to industrial fields such as water treatment, papermaking, and petroleum exploitation.
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  • Food-grade product: Complies with *Food Additive - Polydiallyldimethylammonium Chloride* (GB 1886.223-2016). Strict control is exercised over indicators such as monomer residue, heavy metals, and total bacterial count. It is suitable for high-safety scenarios including food processing and drinking water pretreatment.
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  • Enterprise internal control standards: On the basis of national and industrial standards, stricter internal control standards are formulated to further reduce monomer residues and heavy metal content, improve product stability and application performance, and ensure that product quality is superior to the industry average.

  4.2 Quality Control Requirements

  4.2.1 Raw Material Control

  High-purity dimethyldiallylammonium chloride monomer (DMDAAC, purity ≥ 98%) and initiators (ammonium persulfate, 2,2'-azobis(2-methylpropionamidine) dihydrochloride, etc.; food-grade initiators are used for food-grade products) are adopted as raw materials. Suppliers are strictly selected, and raw materials are subject to comprehensive inspection before being admitted to the plant to ensure they are free of harmful impurities and meet purity requirements. Unqualified raw materials are strictly prohibited from entering the plant, so as to guarantee product quality from the source.

  4.2.2 Production Process Control

  Production adopts an automated polymerization reaction process with full computer monitoring. Key parameters such as reaction temperature (50–70℃), reaction time (4–8 hours), monomer concentration, and initiator dosage are strictly controlled to ensure sufficient polymerization and uniform stability of molecular weight and charge density. Samples are taken and tested every hour during production to adjust process parameters in a timely manner and avoid the generation of non-conforming products. Food-grade product workshops must meet GMP cleanliness standards with full aseptic operation to prevent contamination.

  4.2.3 Finished Product Inspection Rules

  • Factory Inspection: Each batch of products (liquid products ≤20 tons per batch, solid products ≤10 tons per batch) must undergo factory inspection. Inspection items include solid content, molecular weight, charge density, monomer residue, pH value, heavy metal content, etc. Products may only be released after passing inspection and issuance of an inspection report.
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  • Type Inspection: Type inspection shall be conducted once a year, covering all specification parameters of the product. The inspection results shall comply with the requirements of the corresponding standards. In case of major changes in production technology or raw materials, additional type inspections shall be carried out to ensure stable product quality.
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  • Non-conformity Handling: If any product is found non-conforming during inspection, its release shall be stopped immediately, and the product shall be stored in isolation. The cause of non-conformity shall be analyzed, and corrective measures shall be taken (such as re-polymerization and purification). The product may only be released after passing re-inspection. If rectification is not feasible, the product shall be completely scrapped and is strictly prohibited from entering the market.

  4.2.4 Test Method

  All indicator tests shall be conducted in accordance with the methods specified in the corresponding standards, as detailed below:

  
  

  • Solid content: The drying-weighing method is adopted. The sample is dried in an oven at 105℃ to constant weight, and the solid content is calculated.
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  • Molecular weight: The intrinsic viscosity of the aqueous sample solution is determined using the Ubbelohde viscometer method, and the molecular weight is calculated in combination with an empirical formula.
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  • Charge Density: The charge density is determined by titrating the sample with a standard anionic solution using the potentiometric titration method.
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  • Residual monomer content: High Performance Liquid Chromatography (HPLC) is adopted to separate and determine the content of DMDAAC monomer in the sample.
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  • pH value: Directly measured using a pH meter (1% aqueous solution, ambient temperature 25℃).
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  • Heavy metal content: The contents of heavy metals such as lead and arsenic in the sample are determined using the atomic absorption spectrophotometry method.
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  • Total bacterial count: The plate count method is adopted to culture the sample under aseptic conditions and count the number of bacteria.

  • V. Product Applications

    Polydiallyldimethylammonium chloride (PDADMAC) is widely used in water treatment, papermaking, petroleum exploitation, textile printing and dyeing, food processing, medicine, cosmetics and other industries due to its high cationic charge density, excellent flocculation performance and multifunctionality. Its core applications are divided into the following major categories, covering application requirements in different scenarios:

    5.1 Water Treatment Field (Core Application)

    PDADMAC is a highly efficient cationic flocculant and sludge conditioner, suitable for various water treatment scenarios such as industrial wastewater, municipal sewage, and drinking water pretreatment. It can effectively solve problems including turbid water quality, excessive organic matter, and difficult sludge dewatering. Its specific applications are as follows:

    
    

    • Municipal Sewage Treatment: Used for secondary and advanced treatment in urban domestic sewage treatment plants. It can remove suspended solids, colloids, organic matter, chroma, and partial heavy metal ions from sewage, with a COD removal rate of over 80% and a chroma removal rate of over 90%. Meanwhile, as a sludge conditioner, it can improve sludge dewatering performance, reduce sludge moisture content (from 98% to below 80%), cut down sludge disposal costs, and comply with the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB18918-2002).
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    • Industrial wastewater treatment: Suitable for the treatment of industrial wastewater from printing and dyeing, papermaking, chemical industry, electroplating, metallurgy, oil refining, food processing and other industries. According to the characteristics of different types of wastewater, it can be used alone or in combination with PAC and PAM to efficiently remove pollutants in wastewater:
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      • Printing and dyeing wastewater: It removes dye molecules, suspended solids and organic matter from wastewater, with a remarkable decolorization effect. When used in combination with PAC, the decolorization rate can reach over 95% and the COD removal rate over 75%, meeting the Discharge Standard of Water Pollutants for Textile Dyeing and Finishing Industry (GB4287-2012).
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      • Papermaking wastewater: It removes pulp fibers, lignin and suspended solids from wastewater, reduces wastewater turbidity and COD. The treated wastewater can be recycled. Meanwhile, it improves sludge dewatering performance and reduces sludge discharge.
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      • Electroplating wastewater: Removes heavy metal ions (copper, nickel, chromium, etc.) and electroplating additives from wastewater. Through charge neutralization and adsorption, the removal rate of heavy metals reaches over 99%, meeting the *Electroplating Pollutant Discharge Standard* (GB21900-2008).
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      • Chemical wastewater: Treat high-concentration, high-salinity, and high-turbidity chemical wastewater, remove organic matter, colloids, and harmful impurities from the wastewater, reduce wastewater toxicity, and achieve discharge up to standard or reuse.
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    • Drinking Water Pretreatment: Food-grade PDADMAC can be used for the pretreatment of drinking water source water to remove suspended solids, colloids, algae and part of the organic matter in the source water, reduce the turbidity of the source water, provide favorable conditions for subsequent filtration and disinfection processes, and ensure drinking water safety. The residual monomer and heavy metal content in the treated water comply with the *Standards for Drinking Water Quality* (GB5749-2022).
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    • Other water treatment: It can be used in scenarios such as swimming pool water purification, landscape water management, and landfill leachate treatment. It can quickly remove suspended solids and impurities in water, improve water quality, and also provide a certain bactericidal effect while reducing water odor.
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    5.2 Paper Industry

    PDADMAC is widely used in the paper industry as a paper strengthening agent, retention and drainage aid, and sizing agent. The specific applications are as follows:

    
    

    • Paper strengthening agent: Added to pulp, it can adsorb to pulp fibers, enhance the bonding force between fibers, improve the tensile strength, tearing strength and bursting strength of paper, reduce the paper breakage rate, and is especially suitable for the production of cultural paper and packaging paper.
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    • Retention and drainage aid: During the papermaking process, it can adsorb fine fibers and fillers (such as calcium carbonate and talc) in the pulp, improve the retention rate of fibers and fillers, reduce fiber loss in white water, and lower production costs. Meanwhile, it enhances the drainage performance of paper sheets, increases the papermaking speed, and improves production efficiency.
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    • Sizing agent: When used in combination with other sizing agents (such as rosin and starch), it can improve the water resistance and surface smoothness of paper, reduce the ink absorption of paper, enhance the printing effect, and is suitable for the production of printing paper and writing paper.
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    5.3 Petroleum Extraction Field

    PDADMAC is used as a drilling fluid additive and oil displacement agent for tertiary oil recovery in petroleum exploitation, exhibiting excellent viscosity increasing, fluid loss reduction and oil displacement effects.

    
    

    • Drilling fluid additive: When added to drilling fluid, it can increase the viscosity and shear force of the drilling fluid, improve its rheological properties, reduce fluid loss, protect the wellbore and prevent wellbore collapse. Meanwhile, it has a certain bactericidal effect, inhibits the growth of harmful microorganisms in the drilling fluid, and ensures the smooth progress of drilling operations.
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    • Tertiary oil recovery flooding agent: As a cationic flooding agent, it can adsorb onto the surface of reservoir rocks, alter the wettability of the rock surface, reduce the adhesion between crude oil and rocks, and enhance oil recovery. It is especially suitable for tertiary oil recovery in low-permeability reservoirs, and can increase crude oil recovery by 10%-15%.
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    5.4 Textile Printing and Dyeing Industry

    PDADMAC is used as a fixing agent, softener and antistatic agent in textile printing and dyeing to improve the quality and performance of textiles.

    
    

    • Color-fixing agent: Used for color fixation treatment after textile dyeing. It can bind with dye molecules to form stable complexes, improve the fixation rate of dyes on textiles, reduce color fading and staining after dyeing, and enhance the color fastness of textiles (washing resistance and rubbing fastness can be improved by 1-2 grades).
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    • Softener: Added to textile finishing solutions, it can form a protective film on the surface of textiles, making them soft and smooth to the touch, improving wearing comfort, and reducing static electricity generation in textiles.
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    • Antistatic agent: Used for antistatic treatment of synthetic fibers (such as polyester and polyamide). It can reduce static electricity accumulation on the fiber surface, prevent fiber adhesion, pilling and fuzzing, and improve the processing performance and service performance of textiles.
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    5.5 Other Industrial Applications

    • Food processing industry: Food-grade PDADMAC is used as a food additive. As a clarifying agent, it can be applied in the clarification of fruit juices, beverages and beer to remove suspended solids and colloids, thereby improving product transparency and stability. It also serves as a food preservative to inhibit the growth of microorganisms in food and extend the shelf life of food products.
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    • Pharmaceutical industry: Used as a drug carrier and bacteriostatic agent, it can adsorb drug molecules to improve their stability and bioavailability. Meanwhile, it exhibits certain bacteriostatic effects and can be used in the production of medical dressings and disinfection products.
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    • Cosmetics industry: Used as a cosmetic additive, it can act as a thickener, emulsifier and moisturizer to increase the viscosity and stability of cosmetics, improve the texture of products during application, and provide a certain moisturizing effect. It is suitable for products such as face creams, shampoos and hair conditioners.
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    • Others: Used as a pretreatment agent for water treatment membranes, it can remove contaminants from the membrane surface, prevent membrane fouling, and extend the service life of the membrane; used as a soil conditioner, it can improve soil structure, enhance the soil's water and fertilizer retention capacity, and promote plant growth.
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    • VI. Multi-dimensional Image Display

      6.1 Detailed Product Images

      Close-up detail shot of liquid product

      

      Close-up detail shot of solid product

      

      Product Flocculation Effect Diagram

      

      Product Packaging Diagram

      Front view of standard packaging for liquid products

      
      

      

      Front view of standard packaging for solid products (Customizable)

      
      

      

      Bulk Packaging Stacking Diagram

      
      

      

      VII. Usage Method and Precautions

      7.1 Usage Method

      PDADMAC is available in both liquid and solid forms, with simple and convenient application methods. Different usage approaches can be adopted according to the application scenarios and product forms, with the specific steps as follows:

      7.1.1 Usage Method of Liquid Products

      1. Dilution Preparation: Dilute the liquid PDADMAC product with clean water to an appropriate concentration (usually 0.1%–1.0%) according to treatment requirements. Add the product while stirring during dilution to avoid excessively high local concentration that may affect application performance. The water used for dilution shall be clean tap water or deionized water; water containing a large amount of impurities shall be avoided.
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      3. Dosing Operation: Add the diluted PDADMAC aqueous solution to the treatment system (such as wastewater treatment tanks, pulp tanks, drilling fluid tanks, etc.) via a metering pump or manually. The dosage shall be determined based on experiments (generally 10–50 mg/L, i.e., 10–50 g of product per cubic meter of water). Continuous stirring is required during dosing to ensure thorough mixing of the product with the treated medium.
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      5. Reaction Observation: After dosing, observe the reaction effects (such as flocculation effect, sludge dewatering effect, pulp retention rate, etc.), and adjust the dosage according to the actual effect. If the treatment effect is unsatisfactory, the dosage can be increased appropriately, or it can be used in combination with agents such as PAC and PAM to achieve synergistic improvement.
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      7. Note: Liquid products can be added directly (without dilution), but dilution before addition is recommended for easier metering and uniform mixing, as well as to reduce usage costs.

      7.1.2 Instructions for Use of Solid Products

      1. Dissolution Preparation: Select a clean dissolution tank (made of plastic, ceramic, or stainless steel; iron containers are prohibited). Add an appropriate amount of clean water (room temperature is acceptable; water temperature should not exceed 60°C to avoid affecting product activity), and stir evenly.
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      3. Dissolution procedure: Slowly add the solid PDADMAC product into the dissolution tank while stirring. Maintain the stirring speed at 200–300 r/min, with a dissolution ratio of 1%–5% (i.e., 1–5 kg of product added to 100 kg of clean water). Stir for 10–15 minutes until the product is completely dissolved, forming a uniform and transparent aqueous solution without obvious precipitation.
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      5. Dilution and Dosing: According to treatment requirements, dilute the prepared aqueous solution to a concentration of 0.1%–1.0%. Add it to the treatment system via a metering pump or manual dosing. The dosage shall be determined through experiments. Stir continuously after dosing to ensure thorough mixing.
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      7. Reaction Observation: After dosing, observe the reaction effect and adjust the dosage according to actual conditions. If the water quality to be treated is complex, it can be used in combination with other agents to improve the treatment effect.

      7.1.3 Targeted Usage Recommendations for Different Industries

      • Water treatment industry: When used alone, the dosage is 10–50 mg/L; when used in combination with PAC, the dosing ratio of PDADMAC to PAC is 1:5 to 1:10, which can significantly improve the flocculation effect and reduce chemical dosage.
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      • Paper industry: As a retention and drainage aid, the dosage is 0.1%-0.3% of the dry weight of pulp; as a strengthening agent, the dosage is 0.2%-0.5% of the dry weight of pulp, which should be added before pulp forming and mixed thoroughly.
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      • Petroleum extraction industry: As a drilling fluid additive, the dosage is 0.1%-0.5% of the total mass of the drilling fluid; as an oil displacement agent, the concentration is 0.5%-1.0%, and it is injected into the reservoir through the injection system.
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      • Textile printing and dyeing industry: As a fixing agent, dilute it to a concentration of 5%-10%, soak the textiles for 10-20 minutes after dyeing, and then dry them; as a softener, the dosage is 0.3%-0.8% of the total mass of the finishing liquid.

      7.2 Notes

      • Handling Precautions: Wear gloves and a mask during operation to prevent direct contact of the product with the skin and respiratory tract. In case of accidental skin contact, rinse immediately with plenty of clean water. In case of accidental ingestion, seek medical attention promptly.
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      • Storage Requirements:
        • Liquid products: Store in a dry, well-ventilated and cool warehouse, keep away from fire and heat sources, avoid high temperatures (above 80℃) and strong sunlight exposure. The storage temperature should be controlled at 5-30℃; keep sealed to prevent volatilization and contamination, with a shelf life of 12 months.
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        • Solid products: Store in a dry, well-ventilated and cool warehouse, protect against moisture, sunlight and rain; keep the package tightly sealed to prevent caking due to moisture absorption. Maintain a distance of 10–20 cm from warehouse walls and floors to facilitate ventilation. Shelf life is 24 months. If caking occurs due to moisture, the product can be crushed and dissolved before use without affecting its effectiveness.
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      • Dosage Control: The dosage must be determined based on experiments and shall not be increased blindly. Otherwise, it will lead to higher treatment costs and deteriorated water quality (e.g., turbid water, increased foaming). In case of overdosage, an appropriate amount of clean water may be added for dilution, or a small amount of anionic agent may be added for neutralization.
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      • Dissolution Taboos: Do not use hot water for dissolution (water temperature ≤ 60°C). Do not dissolve with strong oxidizers, strong acids, or strong alkalis to avoid chemical reactions that may impair product performance. Solid products should be added slowly during dissolution to prevent caking.
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      • Equipment Maintenance: Dosing equipment (metering pumps, mixing devices, dissolving tanks) shall be cleaned and maintained regularly to prevent blockage caused by product residues; liquid product storage barrels must be cleaned promptly after use to avoid residual product solidification and clogging of the bung.
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      • Emergency Response: In case of product leakage, immediately isolate the leakage area. For liquid products, absorb them with sand or absorbent cotton, and dispose of them properly after collection; for solid products, cover with dry sand, and reuse the collected products by repackaging or dissolving for use. Do not discard them arbitrarily to avoid environmental pollution.
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      • Non-dangerous goods: This product is classified as a non-dangerous good. It is not required to be transported in accordance with dangerous goods transportation standards during transit. However, extrusion, collision, and throwing shall be avoided to prevent packaging damage and product leakage. Transport vehicles shall be kept dry and clean, and mixed transportation with damp materials or strong oxidizing agents is prohibited.
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      • Combined Use: When used in combination with agents such as PAC and PAM, each agent shall be dissolved separately first and then added sequentially. Direct mixing and dissolution are prohibited to avoid chemical reactions that may cause the agents to lose effectiveness.

      • VIII. Packaging and Transportation

        8.1 Packaging Specifications

        This product is available in both liquid and solid forms, with different packaging specifications to ensure sealing, moisture resistance, and damage prevention, meeting the demands of various purchase quantities. The specific packaging specifications are as follows:

        8.1.1 Packaging of Liquid Products

        • Packaging Material: Food-grade or industrial-grade high-density polyethylene (HDPE) plastic drums are used, featuring strong corrosion resistance, good sealing performance, and no peculiar smell, in compliance with relevant standard requirements.
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        • Specifications: The standard specifications are 25kg per drum and 50kg per drum; for bulk purchases, customized packaging of 200kg per drum (large drum) or IBC tank (1000kg per drum) is available to meet the demands of large‑scale industrial procurement.
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        • Packaging Labeling: Clear product information shall be printed on each drum, including product name, specifications (industrial grade/food grade, solid content, molecular weight), net content, implementation standard, production date, batch number, shelf life, manufacturer, contact information, warning labels (keep dry, protect from sunlight, keep sealed), etc., for easy identification and storage.
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        • Sealing Requirements: The drum lid shall adopt a spiral seal and be equipped with a tamper-evident buckle, ensuring a tight seal to prevent product volatilization, leakage and contamination.

        8.1.2 Packaging of Solid Products

        • Packaging Material: Double-layer packaging is adopted. The inner layer is a food-grade polyethylene film bag (thickness ≥ 0.05mm), which is tightly sealed to prevent moisture and leakage of the product. The outer layer is a plastic woven bag (high strength and wear resistance), which can effectively protect the inner packaging and prevent damage during transportation and storage.
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        • Specifications: The conventional specifications are 25kg/bag and 50kg/bag; customized ton bag packaging (1000kg/bag) is available for bulk purchases to meet large-scale industrial procurement needs.
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        • Packaging Labeling: Clear product information shall be printed on each bag, including product name, specifications (industrial grade/food grade, solid content, molecular weight), net content, implementation standard, production date, batch number, shelf life, manufacturer, contact information, warning labels (keep dry, keep sealed, keep away from fire), etc., for easy identification and storage.
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        • Sealing Requirements: The inner film bag shall be sealed by heat sealing, and the outer woven bag shall be stitched with double threads. The sealing shall be tight to prevent moisture absorption, caking and leakage of the product.

        8.2 Transportation Requirements

        • Transportation method: Transport by freight vehicles, with options of road or railway transportation. For bulk transportation, the use of containers or enclosed vans is recommended to avoid rain exposure, direct sunlight, extrusion and collision. Liquid products must be placed upright to prevent leakage.
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        • Transportation Precautions:
          • During transportation, extrusion, collision and dropping shall be avoided to prevent packaging damage and product leakage; liquid products shall be firmly fixed during transportation to avoid tipping and rolling.
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          • Transport vehicles shall be kept dry and clean, and shall not be transported together with damp materials, strong oxidants, strongly acidic or strongly alkaline chemicals, so as to prevent chemical reactions and deterioration of the products.
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          • During transportation, keep away from fire and heat sources, avoid high temperatures and strong sunlight exposure. The transportation temperature for liquid products shall be controlled at 5-35℃ to prevent volatilization or deterioration of the products.
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        • Transport Label: Clear labels shall be affixed to transport vehicles, including "Polydiallyldimethylammonium Chloride", "Non-Dangerous Goods", "Keep Dry, Protect from Sunlight, Keep Sealed", etc., to facilitate identification and management during transportation.
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        • Delivery Acceptance: After receiving the goods, the customer shall promptly check whether the packaging is intact and whether the product has any issues such as leakage, caking, or turbidity. If any problems are found, the customer shall communicate with the manufacturer in a timely manner for resolution.

        •