O,O,O',O'-tetraoctyl-(branched and linear) S,S'-{methylenebis[imino(3-oxopropane-3,1-diyl)]} bis(phosphorothioate)

Auto flammability

Description of key information

The test item has been determined to have an auto-ignition temperature of 228 ± 5 °C. The autoflammability result is probably due to decomposition products rather than the product itself.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

228 °C

Additional information

Key

Method A15 Auto-Ignition Temperature (Liquids and Gases) of Commission Regulation (EC) No 440/2008 of 30 May 2008, Carbolite flask heater. The test item has been determined to have an auto-ignition temperature of 228 ± 5 °C.

Supporting

This test method covers the determination of hot- and cool-flame autoignition temperatures of a liquid chemical in air at atmospheric pressure in a uniformly heated vessel.

A small, metered sample of the product to be tested is inserted into a uniformly heated 500-ml glass flask containing air at a predetermined temperature. The contents of the flask are observed in a dark room for 10 min following insertion of the sample, or until autoignition occurs. Autoignition is evidenced by the sudden appearance of a flame inside the flask and by a sharp rise in the temperature of the gas mixture. The lowest internal flask temperature (T) at which hot-flame ignition occurs for a series of prescribed sample volumes is taken to be the hot-flame autoignition temperature (AIT) of the chemical in air at atmospheric pressure. Ignition delay times (ignition time lags) are measured in order to determine the ignition delay-ignition temperature relationship.

The temperatures at which cool-flame ignitions are observed or evidenced by small sharp rises of the gas mixture temperature are also recorded along with the corresponding ignition delay times. The lowest flask temperature at which cool-flame ignition occurs is taken to be the cool-flame autoignition temperature (CFT). Similarly, observations are made of any nonluminous preflame reactions, as evidenced by a relatively gradual temperature rise which then falls off to the base temperature. The lowest flask temperature at which these reactions are observed is the reaction threshold temperature (RTT).

The auto-ignition temperature of the test substance was determined to be 256 deg. C. The autoflammability result is probably due to decomposition products rather than the product itself.