Trimethyl phosphate

CAS: 512-56-1

Overview

Trimethyl phosphate (CAS 512-56-1 ), also known as TMP and trimethyl orthophosphate, is an organophosphate ester used industrially as a flame retardant additive and pH buffering agent.

Its low volatility and thermal stability make it a practical processing aid across polymer, textile, and cleaning formulations. In plastics and polymer manufacturing, TMP functions as a flame retardant plasticizer.

It is incorporated into resins and coatings to meet fire performance specifications. Textile processors use it as a finishing agent where controlled phosphate release contributes to flame resistance in treated fabrics.

In home care and industrial cleaning formulations, TMP acts as a pH buffer and sequestrant to stabilize active ingredients across varying water hardness conditions. This ensures product stability and performance.

The leather and paper industries apply it during processing stages where controlled acidity and surface treatment consistency are required. It is a versatile chemical for diverse industrial manufacturing needs.

Trimethyl phosphate is supplied as a clear liquid in drum and IBC quantities, with bulk tanker options available for larger procurement volumes. Technical grade is the standard commercial offering.

Purity levels are typically at 99% or higher for industrial applications. Buyers sourcing for specialty polymer or electronics applications should confirm specification sheets against process-specific purity requirements.

Physical Properties

Melting Point	-46 °C
Boiling Point	85 °C @ Press: 26 Torr
Density	1.2144 g/cm³ @ Temp: 20 °C
Flash Point	107 °C
Appearance	Clear liquid
Color	Clear
Form	Liquid
Water Solubility	500 G/L (25 ºC)
Vapor Pressure	1.133 hPa (25 °C)
Refractive Index	n 20/D 1.395(lit.)
Log P	-0.46 at 25℃

Safety & Handling

Danger GHS07 GHS08 Hazard Statements H302 Harmful if swallowed H315 Causes skin irritation H319 Causes serious eye irritation H320 Causes eye irritation H340 May cause genetic defects H351 Suspected of causing cancer H360 May damage fertility or the unborn child H361 Suspected of damaging fertility or the unborn child H371 May cause damage to organs H373 May causes damage to organs through prolonged or repeated exposure Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P280 Wear protective gloves/protective clothing/eye protection/face protection. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code	29199000
Storage Class	6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects
WGK (Germany)	1

Other Names

Industries

Plastics & Polymers Home Care & Industrial Cleaning Textile, Leather & Paper