My first thought is that the biggest flame or explosion risk doesn't come from the residue, but from the gases evolved when the residue is created.
Castor oil isn't expect to decompose at 160°C.
Then, if you want to determine a flash point, the simplest way is to bring a sample of your tar to the chemistry lab of a university. If not, try to reproduce the standard method:
- March 29, 2017, 09:05:21 AM
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