Tris(2-ethylhexyl) Phosphite (TEHP / Tris(2-ethylhexyl)phosphite)
1. Basic Identification
IUPAC Name: Tris(2-ethylhexyl) phosphite
Synonyms: Tri(2-ethylhexyl) phosphite, TEHP phosphite, Antioxidant 180, Plastic auxiliary phosphite stabilizer
EINECS No.: 254-179-4
MDL No.: MFCD00015266
Molecular Formula: \(\boldsymbol{C_{12}H_{27}O_3P}\)
Molecular Weight: 250.31
SMILES: CCC(CC)C(CC)CCOP(OC
C@HCC
C@@HCC)OC
C@HCC
C@@HCC
UN Number: Not dangerous goods
HS Code: 2920909090
Hazard Classification: GHS mild irritant only, non-dangerous goods for sea/land transport
Chemical Category: Organic phosphite auxiliary antioxidant, PVC heat stabilizer, polyolefin processing stabilizer, lubricant anti-oxidant, polyester resin anti-yellowing agent
2. Physical & Chemical Properties
Appearance
Colorless to pale yellow transparent oily liquid, mild aliphatic ester odor, good fluidity at room temperature, no precipitation, non-volatile under normal processing temperature.
Physical Constant Table
| Parameter |
Standard Value |
Remarks |
| Melting Point |
< -20 ℃ |
Completely liquid under all normal production & storage conditions |
| Boiling Point |
>320 ℃ (decomposes) |
Decomposes above 300 ℃, releases phosphorous acid and branched alcohol fragments |
| Density (20 ℃) |
0.890–0.896 g/mL |
Lighter than water, fully insoluble in water |
| Refractive Index \(n_{20/D}\) |
1.440–1.446 |
Purity detection index |
| Closed Cup Flash Point |
>160 ℃ |
Very low flammability risk |
| Water Solubility |
Practically insoluble in cold/hot water |
|
| Organic Miscibility |
Fully miscible with PVC plasticizers, mineral oil, xylene, toluene, esters, polyether, PE/PP molten resin |
|
Core Chemical Characteristics
- Phosphite antioxidant active structure
Trivalent phosphorus P(III) captures peroxide free radicals generated during polymer high-temperature processing, decomposes hydroperoxides to inhibit oxidative degradation and yellowing; synergistic with hindered phenol antioxidants.
- Metal ion passivation
Forms stable chelate complexes with trace metal ions (Fe, Cu, Zn) in raw materials, eliminates catalytic oxidation points of plastics.
- Hydrolysis sensitivity
Slowly hydrolyzed under high temperature + long-term moisture contact to generate 2-ethylhexanol and phosphorous acid, loses stabilizing performance; sealed moisture-proof storage required.
- Incompatible materials: Strong alkalis, concentrated mineral acids, long-term high humidity environment, edible raw materials
3. Export Industrial Quality Specifications (Mainstream Plastic Stabilizer Grade)
| Test Item |
Standard Spec |
Test Method |
| Tris(2-ethylhexyl) Phosphite Content |
≥98.0 wt% |
GC / Phosphorus titration |
| Total Phosphorus Content |
12.0–12.6 wt% |
EDTA complexometric titration |
| Acid Value |
≤0.1 mgKOH/g |
Potentiometric titration |
| Moisture Content |
≤0.05 % |
Karl Fischer Titration |
| Color (APHA) |
≤100 |
Platinum-Cobalt Colorimetry |
| Appearance |
Colorless to pale yellow clear oily liquid without suspended sediment |
Visual Inspection |
Low-Acid Food Contact Special Grade
Acid value ≤0.05 mgKOH/g, heavy metal limits compliant with EU food contact plastic regulations.
4. Main Industrial Applications
4.1 PVC Plastic Processing Industry (Largest Consumption)
- Secondary heat stabilizer for soft/hard PVC films, hoses, artificial leather, calendered sheets; compounded with calcium/zinc composite stabilizers to improve anti-yellowing during extrusion and high-temperature aging.
- Metal ion passivator, eliminates catalytic oxidation discoloration caused by iron, copper equipment residues.
4.2 Polyolefin & Polyester Industry
- Processing antioxidant for PE, PP, EVA, PET; prevents melt fracture, yellowing and gel generation during granulation and film blowing.
- Synergistic auxiliary with hindered phenol antioxidants (1010, 168), significantly extending product weather resistance.
4.3 Lubricant & Metal Working Fluid Industry
- High-temperature antioxidant additive for gear oil, hydraulic oil, metal cold rolling oil; inhibits oil sludge formation under long-term high-temperature circulation.
- Extreme-pressure anti-wear auxiliary for water-based cutting fluid.
4.4 Coating & Adhesive Fields
- Anti-yellowing stabilizer for alkyd resin, unsaturated polyester, polyurethane coating, shortens baking time and improves coating transparency.
- Light stabilizer auxiliary for solvent-based adhesives, prevents adhesive layer aging and brittleness.
5. Toxicology, Health Hazards & First Aid
Toxicity Profile
- Acute Oral LD50 (Rat): >5000 mg/kg, extremely low oral toxicity
- Dermal hazard: Very mild degreasing irritant; long-time continuous contact causes slight dry skin, no corrosiveness
- Inhalation hazard: Room-temperature vapor concentration extremely low; only hot mist produces transient mild throat discomfort
- Eye hazard: Liquid splashing leads to temporary slight stinging and conjunctival redness, no permanent corneal damage
- Environmental hazard: Biodegradable, low toxicity to aquatic organisms
Exposure Symptoms
- Inhalation of hot mist: Slight dry throat, transient cough
- Skin contact: Mild dry, itchy rash after long-term contact
- Eye splash: Temporary burning, slight eye redness
- Oral ingestion: Mild abdominal distension without severe organ damage
Complete First-Aid Procedures
- Inhalation: Move victim to well-ventilated fresh air and rest, gargle with clean water.
- Skin Contact: Remove contaminated clothing, wash skin repeatedly with soap and plenty of cold running water for 10–15 minutes.
- Eye Contact: Force open eyelids, continuously flush eyes with abundant cold clean water ≥10 minutes, ophthalmic examination if discomfort persists.
- Oral Intake: Drink plenty of warm water or milk for dilution, observe symptoms; seek medical help if nausea occurs.
6. Storage, Handling & Incompatibility Rules
Mandatory Storage Conditions
- Warehouse classification: General organic chemical warehouse, separate storage from strong acids, strong alkalis.
- Temperature control: Store at 5–35 ℃, cool dry warehouse, avoid long-term high-temperature baking to prevent hydrolysis.
- Sealing requirement: 200L HDPE plastic drum fully airtight sealed to block moisture and avoid color deepening.
- Shelf life: 18 months under intact sealed packaging.
Strictly Separated Incompatible Materials
Caustic soda flakes, potassium hydroxide, concentrated sulfuric acid, hydrochloric acid.
Safe Operation Specifications
- Operators wear ordinary nitrile oil-resistant gloves and safety goggles; dust/mist respirator required for high-temperature feeding operations.
- Prevent oily liquid from spilling on the ground; absorb small leakage with dry sand and collect waste oil into sealed plastic waste barrels.
- Waste phosphite liquid can be handed over to certified organic waste disposal institutions for incineration treatment.
7. Export Packaging & Transportation Regulations
Standard Export Packaging Modes
- Industrial plastic stabilizer grade: 200L HDPE plastic drum
- Small batch: 25L thick-wall food-grade plastic bucket
Transport Compliance
Non-dangerous goods, ordinary general cargo sea/land transport, no UN dangerous goods label required
Full Export Document Package
- COA Certificate of Analysis
- GHS MSDS / SDS
- TDS Technical Data Sheet
- Food contact raw material test report (special grade)
8. GHS Global Hazard Label Statements
Signal Word: Warning
Hazard Statements:
H315 Causes skin irritation
H319 Causes serious eye irritation
Precautionary Statements:
P280 Wear protective gloves and eye protection
P305+P351+P338 IF IN EYES: Rinse continuously with water for several minutes
P403+P235 Store in cool, dry, ventilated warehouse, tightly sealed and moisture-proof
P501 Dispose of waste oily liquid in accordance with local organic waste chemical regulations
9. Fire Emergency Disposal Plan
Approved Fire Extinguishing Agents
Dry chemical powder, carbon dioxide (CO₂), alcohol-resistant foam, water mist
Forbidden Agents: No special forbidden extinguishing medium
Fire Site Operation Steps
- Evacuate personnel to upwind safe zone, isolate fire area.
- Cool surrounding plastic drums with water mist to avoid thermal decomposition and discoloration.
- Collect oily residual waste after fire to prevent random inflow into sewers and water bodies.
10. Printable Export COA Template
CERTIFICATE OF ANALYSIS
Product Name: Tris(2-ethylhexyl) Phosphite (TEHP)
CAS No.: 38891-59-7
Grade: Export Plastic Antioxidant Industrial Grade
Batch No.: ____________
Net Weight: 200kg/drum
Manufacture Date: ____________
| Test Item |
Standard Spec |
Test Result |
Test Method |
| Tris(2-ethylhexyl) Phosphite Purity |
≥98.0 % |
|
GC Gas Chromatography |
| Total Phosphorus Content |
12.0–12.6 % |
|
Phosphorus Titration |
| Acid Value |
≤0.1 mgKOH/g |
|
Potentiometric Titration |
| Moisture Content |
≤0.05 % |
|
Karl Fischer Titration |
| Color (APHA) |
≤100 |
Platinum-Cobalt Colorimetry |
|
| Appearance |
Colorless to pale yellow clear oily liquid without precipitate |
Visual Inspection |
|
Conclusion: This batch complies with export industrial standard of Tris(2-ethylhexyl) Phosphite.
Inspector Signature: ____________
Issuance Date: ____________
11. E-commerce Listing Copy (Alibaba / Echemi Direct Use)
Product Title
Tris(2-ethylhexyl) Phosphite TEHP CAS 38891-59-7 Pale Yellow Oily Liquid PVC Polyolefin Processing Antioxidant Secondary Heat Stabilizer Lubricant Anti-Oxidant Additive
Short Description
Tris(2-ethylhexyl) phosphite (C₁₂H₂₇O₃P, CAS 38891-59-7) high-purity organic phosphite oily liquid, universal polymer processing auxiliary antioxidant. Widely compounded with calcium-zinc stabilizer for PVC, PE, PP film anti-yellowing; also used as high-temperature antioxidant for industrial lubricants and polyester coatings. Non-dangerous general chemical, full COA & MSDS documents for bulk export.
Full Description
Tris(2-ethylhexyl) phosphite (TEHP) is a mainstream trivalent phosphite processing stabilizer, supplied as pale yellow transparent oily liquid with ≥98% effective content. Its trivalent phosphorus structure decomposes polymer peroxides and passivates metal catalytic ions, effectively suppressing plastic thermal oxidative discoloration during extrusion and calendering, with excellent synergistic effect with hindered phenol primary antioxidants. It needs moisture-proof sealed storage to avoid hydrolysis and acid value rise.
Core downstream application sectors: secondary anti-yellowing heat stabilizer for soft/hard PVC film, hose and artificial leather; processing antioxidant for PE, PP, PET granulation and blown film; high-temperature anti-sludge additive for hydraulic oil, gear oil and metal rolling fluid; anti-aging auxiliary for unsaturated polyester, alkyd baking coatings and solvent adhesives. We supply standard industrial general grade and low-acid food-contact special grade compliant with EU regulations.
Packed in 200L HDPE plastic drums for full-container sea freight. Classified as ordinary non-dangerous goods for general sea transport, we provide complete COA, MSDS, TDS and food contact compliance certificates for long-term bulk supply to plastic compounding factories, antioxidant additive manufacturers and lubricant production enterprises.
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