Di-(2-ethylhexyl)phosphoric acid

  • Dioctyl acid phosphate
  • bis(2-Ethylhexyl) hydrogen phosphate
  • bis(2-ethylhexyl) phosphate
  • Phosphoric acid di(2-ethylhexyl) ester
  • HDEHP
  • TOPS 99
Formula
(CH3(CH2)3CH(C2H5)CH2O)2POOH
Structure
Description
Odorless light yellow liquid.
Uses
Additive to lubrication oils, corrision inhibitor and antioxidant.

Registry Numbers and Inventories.
CAS
298-07-7
EC (EINECS/ELINCS)
206-056-4
EC Class
harmful, corrosive
R 21 34
S 26 36/37/39 45
RTECS
TB7875000
RTECS class
Primary Irritant
UN (DOT)
1902
Beilstein/Gmelin
1712988
Beilstein Reference
4-01-00-01786
Swiss Giftliste 1
G-3778
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C16H35O4P
Formula mass
322.43
Melting point, °C
-50
Boiling point, °C
393
Vapor pressure, mmHg
3E-7 (25 C)
Vapor density (air=1)
11.46
Density
0.9758 g/cm3 (20 C)
Solubility in water
Insoluble
Viscosity
186.92 cp (30 C)
Surface tension
20 g/s2
Refractive index
1.443 (20 C)
pKa/pKb
1.47 (pKa)
Partition coefficient, pKow
6.09
Heat of vaporization
70.6 kJ/mol
Heat of combustion
-10464 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Corrosives area.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Do not breathe dust, vapor, mist, or gas. Do not get in eyes, on skin, or on clothing. Avoid ingestion and inhalation. Do not ingest or inhale. Discard contaminated shoes.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Clean up spills immediately, using the appropriate protective equipment. Provide ventilation. Do not get water inside containers.
Disposal code
1
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, metals.
Decomposition
Phosphorous fumes.

Fire.
Flash Point,°C
191
Autoignition, °C
> 300
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Extinguishing media: Do NOT get water inside containers. For large fires, use dry chemical, carbon dioxide, alcohol-resistant foam, or water spray. For small fires, use carbon dioxide, dry chemical, dry sand, or alcohol-resistant foam. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Slight risk when exposed to heat or flame. May form flammable hydrogen gas.
Hazards
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.
Combustion products
Irritating phosphorus oxides may be released.
Health
2
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
2
Exposure effects
Effects may be delayed.
   Ingestion
May cause severe and permanent damage to the digestive tract. Causes gastrointestinal tract burns. May cause perforation of the digestive tract. May cause systemic effects.
   Inhalation
Causes chemical burns to the respiratory tract. Aspiration may lead to pulmonary edema. May cause systemic effects.
   Skin
Causes skin burns. May be harmful if absorbed through the skin. May cause skin rash (in milder cases), and cold and clammy skin with cyanosis or pale color.
   Eyes
Causes eye burns. May cause chemical conjunctivitis and corneal damage.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Do not use mouth-to-mouth respiration if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
1902
Response guide
Hazard class
8
Packing Group
III
 
USCG CHRIS Code
DEP
 
1 Non-oxidizing mineral acids
HS Code
2919 00 90
 
IMO Chemical Code
17
IMO Pollution Category
C
IMO Hazard code
S/P