Summary
1 - DEFINITION, CLASSIFICATION
Tars derive from the dry distillation of a combustible. Combustibles, heated to a high temperature in the absence of air produce various gases and a dark, water-insoluble liquid called tar.
The following tars can be distinguished depending on the combustibles used:
– wood tar (pine or beech tar, birch tar oil, or cedar wood oil or cade oil);
– fossiliferous tars (coal tar);
– sedimentary tars (of schistic or petroleum origin).
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