I am currently working a case where spontaneous ignition is being considered as a potential ignition source. Information I am trying to find involves testing of the required time needed for a load of towels, contaminated with self-heating oils to reach a temperature for ignition to occur once the external heat source is taken away. I have found a great deal of information detailing requirements for ignition to occur, however, none of these tests describe the time component. Does anyone have any information on time requirements for spontaneous ignition involving self heating oils?

Thank you for any help.