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with flash points of seven and eight tenths degrees Celsius(37.8°C) or higher,
the total of which make up ninety nine percent (99%) or more of the total
volume of the mixture. Flammable liquids are classified as follows:
Class I-A Liquids include those liquids having flash points below twenty
two and eight tenths degrees Celsius (22.8°C), and having a boiling point
below thirty seven and eight tenths degrees Celsius (37.8°C).
Class I-B Liquids include those liquids having flash points below twenty two
and eight tenths degrees Celsius (22.8°C), and having a boiling point at or
above thirty seven and eight tenths degrees Celsius (37.8°C).
Class I-C Liquids include those liquids having flash points at or above
twenty two and eight tenths degrees Celsius (22.8°C), and below thirty
seven and eight tenths degrees Celsius (37.8°C).
Flammable Vapor Area. An area in which the concentration of flammable
constituents (vapor, gas, fume, mist or dust) in air exceeds twenty five percent
(25%) of their lower flammable limit (LFL) because of the flammable finish
processes operation. It shall include: (1) the interior of spray booths; (2) the
interior of ducts exhausting from spraying processes; (3) any area in the direct
path or any area containing dangerous quantities of air-suspended powder,
combustible residue, dust, deposits, vapor or mists as a result of spraying
operations; and (4) the area in the vicinity of dip tanks, drain boards or
associated drying, conveying or other equipment during operation or
shutdown periods.
Flash Point of a Liquid. The lowest temperature a liquid at which sufficient
vapor is given off to form an ignitable mixture with air, near the surface of the
liquid or within the vessel used, as determined by appropriate laboratory test,
as follows:
The flash point of liquids having a flash point at or below seventy nine
degrees Celsius (79°C), except for fuel oils and certain viscous materials
shall be determined in accordance with the Standard Method of Test for
Flash Point by the Tag Closed Tester, ASTM D 56-61.
The flash point of liquids having a flash point above seventy nine degrees
Celsius (79°C), except for fuel oils, shall be determined in accordance with
the Standard Method of Test for Flash Point by the Cleveland open Cup
Tester, ASTM D 92-57.
The flash point of fuel oil, and certain viscous materials having a flash point
at or below seventy nine degrees Celsius (79°C), shall be determined in
accordance with the Standard Method of Test for Flash Point by the
Pensky-Martens Closed Tester, ASTM 93-62.
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