Industrial, Analytical & Food Grade Potassium Bisulfate (Potassium Hydrogen Sulfate) CAS 7646-93-7 Acidic Flux, Preservative & Analytical Reagent for

Potassium Bisulfate (also named Potassium Hydrogen Sulfate, Acid Potassium Sulfate, CAS: 7646-93-7, EINECS: 231-594-1, HS Code: 2833298000) is a white crystalline granular or powdery inorganic acid salt with the formula KHSO₄ and molecular weight 136.17. We supply industrial grade, reagent grade and food grade products complying with international quality standards. It is highly soluble in water with strong acidic aqueous solution, insoluble in ethanol, and hygroscopic under humid conditions. At high temperature it dehydrates to form potassium pyrosulfate. Widely used as analytical flux, acid catalyst, food preservative, pH adjuster and raw material for fine chemicals and fertilizers.

Applications
Analytical Chemistry & Mineral Processing (Core Application)
Standard flux for decomposition of minerals, siliceous compounds and refractory samples in analytical laboratories and metallurgical testing. It melts and dissolves insoluble ores and oxides at high temperature, enabling accurate determination of silicon, metal and rare element contents, and is an essential reagent for geochemical analysis and ore quality inspection.
Food & Beverage Industry
Food grade product serves as preservative and acidity regulator in processed food, condiments and beverage products. It inhibits microbial growth, extends shelf life, adjusts product acidity to improve flavor, and complies with international food additive safety standards.
Organic Synthesis & Fine Chemicals
High-efficiency solid acid catalyst for esterification, condensation, dehydration and other organic reactions. It replaces liquid sulfuric acid in many processes, features lower corrosion and simpler post-treatment, and is also used as dehydrating agent for synthesis of fine chemicals and pharmaceutical intermediates.
Agriculture & Fertilizer Industry
Applied as acidic soil amendment and potassium-sulfur fertilizer raw material. It supplies available potassium and sulfur nutrients for crops, regulates soil pH to improve nutrient absorption efficiency, and is suitable for improving alkaline soil and promoting crop growth.
Water Treatment & Industrial Cleaning
Used as pH adjuster for industrial circulating water and wastewater systems, and as active component of industrial descaling cleaners. It effectively dissolves scale and metal oxide deposits on equipment surfaces, and also acts as auxiliary agent for water disinfection and hard water treatment.
Other Industrial Applications
Raw material for producing potassium pyrosulfate and various specialty sulfates. Also used as additive in electroplating industry, dyeing auxiliary for textile processing, and acidizing agent for oilfield exploitation to improve reservoir permeability.

Product Advantages
✅ High purity with low impurities: ≥99% main content with minimal residue, suitable for precision analysis and high-end industrial processes
✅ Solid acid with safe handling: Solid form of strong acid, safer and more convenient for storage, transportation and dosing than liquid sulfuric acid
✅ Full grade options: Industrial, reagent and food grades available, meeting quality standards of different application scenarios
✅ Excellent solubility: Fast dissolution in water, stable acidic solution, easy for formulation preparation and on-site use
✅ Multi-functional performance: Integrates fluxing, catalysis, acidification and preservation functions, covering a wide range of industrial scenarios
✅ Stable supply capacity: Mature production process with sufficient capacity, consistent batch quality and competitive market price

Packaging & Storage
Standard packaging: 25kg paper-plastic composite bags with inner PE liner; 500kg / 1000kg FIBC bulk bags available for bulk orders. The product is hygroscopic. Store in a cool, dry and well-ventilated warehouse. Keep containers tightly sealed, away from strong alkalis, reducing agents, active metal powders and direct moisture. Shelf life is 24 months under proper storage conditions.
Safety Information
Classified as Class 8 corrosive substance for transportation (UN 3260, Packing Group II). It is corrosive and irritating to skin, eyes and respiratory tract, and may cause burns. Wear acid-resistant gloves, goggles and dust mask during handling. Avoid direct contact with skin and eyes. In case of contact, rinse immediately with plenty of clean water for at least 15 minutes and seek medical attention if necessary. Complete MSDS and relevant qualification certificates are available upon request.

1. 1.A 70,000 ㎡ warehouse (20,000 MT capacity) with moisture-proof and temperature-controlled systems, enabling efficient fulfillment of large-volume orders.
2. 2.Free samples (Ship within 3-7 days) to let you test products at zero trial cost.
3. 3.Transparent lead time for hazardous chemicals: 45–60 days, with clear delivery schedules.
4. 4.Certified with a Hazardous Chemical Business License and ISO certification, ensuring smooth customs clearance.
5. 5.6 packaging options with customizable logos to minimize product loss during transportation.
6. 6.Over 400 chemical SKUs available for one-stop procurement, helping you reduce sourcing costs.