As a result of the recently revised OSHA Hazard Communication standard, 1910.106 was revised on March 26, 2012. Previously, 1910.106 used the term combustible liquid and flammable liquid. However, the revised standard only uses the term flammable liquid. Flammable liquid means any liquid having a flashpoint at or below 199.4 F (93 C). In addition, the term classes has been replaced by categories:

Category 1: Liquids having flashpoints below 73.4 F (23 C) and having a boiling point at or below 95 F (35 C).

Category 2: Liquids having flashpoints below 73.4 F (23 C) and having a boiling point above 95 F (35 C).

Category 3: Liquids having flashpoints at or above 73.4 F (23 C) and at or below 140 F (60 C). When a category 3 liquid with a flashpoint at or above 100 F (37.8 C) is heated for use to within 30 F (16.7 C) of its flashpoint, it shall be handled in accordance with the requirements for a category 3 liquid with a flashpoint below 100 F (37.8 C).

Category 4: Liquids having flashpoints above 140 F (60 C) and at or below 199.4 F (93 C). When a category 4 flammable liquid is heated for use to within 30 F (16.7 C) of its flashpoint, it shall be handled in accordance with the requirements for a category 3 liquid with a flashpoint below 100 F (37.8 C).

Click here to see the revised OSHA 1910.106 standard.

Jon