2-Ethylhexyl diphenyl phosphate （CAS#1241-94-7）

Chemical Property:

1241-94-7 - Physico-chemical Properties

Molecular Formula	C20H27O4P
Molar Mass	362.4
Density	1,09 g/cm3
Melting Point	-54°C
Boling Point	375°C
Flash Point	224 °C
Water Solubility	Insoluble
Solubility	Chloroform (Slightly), Methanol (Slightly)
Vapor Presure	26.7Pa at 150℃
Appearance	Transparent liquid
Color	Colourless
Storage Condition	2-8°C
Refractive Index	1.5080 to 1.5110
MDL	MFCD00059949
Physical and Chemical Properties	Colorless transparent liquid. Freezing point -60 °c; Boiling point 375 °c, 239 °c (1.3 °c); Relative density 1.080-1.090(25 °c); Refractive index 1.506-1. 3千帕 (25 °c). It is miscible with common organic solvents and insoluble in water.
Use	Used as additive flame retardant and flame retardant plasticizer, suitable for synthetic resin and synthetic rubber can improve weather resistance, abrasion resistance, moisture resistance and toughness. Store in a cool, ventilated warehouse.

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Product Detail

Product Tags

2-Ethylhexyl diphenyl phosphate (EHDP, DPOP, Santicizer® 141, CAS 1241-94-7) is an organophosphate ester compound with the molecular formula C₂₀H₂₇O₄P and molecular weight 362.41 g/mol. It appears as a colorless to pale yellow, clear, low-viscosity liquid with a slightly sweet odor. This non-halogen, high-efficiency additive uniquely functions as both a flame retardant and a plasticizer—a dual-purpose capability known as a flame retardant plasticizer. EHDP is particularly valued for its fast-fusing behavior, excellent gelation properties, and outstanding compatibility with a wide range of polymers, including PVC, TPU, NBR, cellulose acetate, acrylics, epoxies, and polyesters. Its low volatility (flash point: 224°C) and good weathering resistance make it an ideal choice for applications where fire risk reduction is a priority.

Specifications

Parameter	Specification
Product Name	2-Ethylhexyl diphenyl phosphate (EHDP; DPOP; Octyl diphenyl phosphate)
CAS No.	1241-94-7
EINECS No.	214-987-2
Molecular Formula	C₂₀H₂₇O₄P
Molecular Weight	362.41 g/mol
IUPAC Name	2-ethylhexyl diphenyl phosphate
Appearance	Colorless to pale yellow clear liquid
Purity (Industrial Grade)	≥99.0% (GC)
Purity (Pharmaceutical Grade)	≥99.5% (HPLC)
Density (25°C)	1.080–1.090 g/cm³
Boiling Point	375°C (at 760 mmHg)
Melting Point / Pour Point	-54°C
Flash Point (closed cup)	224°C
Viscosity (25°C)	16–25 cP
Refractive Index (nD20)	1.5080–1.5110
Acidity	≤0.2 mg KOH/g
Moisture (KF)	≤0.1%
Color (APHA)	≤30
Phosphorus Content	approx. 8.5%
Water Solubility	Insoluble (~1.9 mg/L at 25°C)
Solubility in Organic Solvents	Miscible with common organic solvents
LogP	6.17
HS Code (China Export)	2919900090
UN Number	UN3082 (Class 9, PG III)
Storage Conditions	Tightly closed, dry and well-ventilated place; recommended storage temperature: 2–8°C

Applications

2-Ethylhexyl diphenyl phosphate is a versatile flame retardant plasticizer with applications across multiple industries:

Application Sector	Key Uses
PVC (Polyvinyl Chloride)	Used as a primary or secondary plasticizer in flexible PVC applications including wire and cable insulation, flooring, coated fabrics, conveyor belts, hoses, and structural foams. EHDP provides excellent gelation, fast fusion, and flame retardancy without compromising flexibility.
TPU (Thermoplastic Polyurethane)	Functions as a flame retardant additive in TPU for automotive interior parts, electronic device housings, and industrial components requiring fire resistance and durability.
Rubber Compounds (NBR, SBR, etc.)	Improves flame retardancy and processing flexibility in nitrile butadiene rubber (NBR) and other synthetic rubber formulations for gaskets, seals, and industrial hoses.
Cellulose Acetate & Other Resins	Used as a plasticizer and flame retardant in cellulose acetate for eyewear frames, tool handles, and consumer goods; also compatible with acrylics, epoxy, polyester, and phenolic resins.
Coatings & Adhesives	Enhances fire resistance and flexibility in industrial coatings, adhesives, and sealants based on synthetic resins and rubbers.
Lubricants & Hydraulic Fluids	Serves as a flame retardant additive in hydraulic fluids and lubricants for high-temperature applications, including large aircraft hydraulic systems.

Key Performance Benefits:

✅ Non-halogen flame retardant – Meets stringent environmental regulations and RoHS/REACH compliance standards.
✅ Fast-fusing and high solvating – Enhances processing efficiency and polymer compatibility.
✅ Low volatility and migration resistance – Maintains performance stability over extended service life.
✅ Excellent weather resistance – Improves weatherability, abrasion resistance, and moisture resistance in finished products.
✅ Synergistic performance – Works effectively with phthalate plasticizers to improve product toughness, weather resistance, and tensile strength in PVC films.