From: "Secretary, ACS Division of Chemical Health and Safety" <secretary**At_Symbol_Here**DCHAS.ORG>
Subject: Re: [DCHAS-L] Update on Statement from the ACS Committee on Chemical Safety regarding the “Tornado Experiment”
Date: Mon, 8 Sep 2014 07:36:43 -0400
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 444874BB-1589-44EE-8A22-C8E33ECE498D**At_Symbol_Here**dchas.org


With regard to the flammable liquids definitions posted yesterday, someone who preferred to stay anonymous wanted to point out:

> I knew this was going to bite people, it did me:

Melvin?s post refers to the OSHA criteria for flammable liquids in the previous version of 1910.106 Flammable and Combustible Liquids, now titled ?Flammable Liquids?. Combustible liquids have been stricken from this OSHA standard. Refer to the more recent definition and ?Categories? of flammable liquids (welcome GHS):

1910.106(a)(19)
Flammable liquid means any liquid having a flashpoint at or below 199.4 °F (93 °C). Flammable liquids are divided into four categories as follows:
1910.106(a)(19)(i)
Category 1 shall include liquids having flashpoints below 73.4 °F (23 °C) and having a boiling point at or below 95 °F (35 °C).
1910.106(a)(19)(ii)
Category 2 shall include liquids having flashpoints below 73.4 °F (23 °C) and having a boiling point above 95 °F (35 °C).
1910.106(a)(19)(iii)
Category 3 shall include 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).
1910.106(a)(19)(iv)
Category 4 shall include 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 at or above 100 °F (37.8 °C).

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