Boiling Point
The temperature at which a liquid changes to a vapor. The boiling point and flash point of a flammable liquid determine its category.
Bond Wire
A metal wire that connects two objects to reduce the buildup of electrical charges between them. Bond wires are used when transferring fla...
Flammable/Combustible Liquids 191
Detailed Answer Test 2024/2025
Boiling Point
The temperature at which a liquid changes to a vapor. The boiling point and flash point of a flammable
liquid determine its category.
Bond Wire
A metal wire that connects two objects to reduce the buildup of electrical charges between them. Bond
wires are used when transferring flammable and combustible liquids from one container to another.
Physically connecting two electrically conductive objects to eliminate any difference in their static
charge potential. Metal containers are often bonded using a metallic bond wire.
Category 1 Liquids
A flammable liquid with a flash point under 73.4°F (23°C) and a boiling point at or below 95°F (35°C).
Category 2 Liquids
A flammable liquid with a flash point under 73.4°F (23°C) and a boiling point above 95°F (35°C).
Category 3 Liquids
A flammable liquid with a flash point at or above 73.4°F (23°C) and a boiling point at or below 140°F
(60°C).
Category 4 Liquids
A flammable liquid with a flash point at or above 140°F (60°C) and a boiling point at or below 200°F
(93°C).
Class II
, A combustible liquid with a flash point between 100°F (37.8°C) and 140°F (60°C). Class II is the most
dangerous of the combustible liquid classes.
Class III
A combustible liquid with a flash point at or over 140°F (60°C). Class III liquids are divided into subclasses
IIIA and IIIB.
Class IIIA
A combustible liquid with a flash point between 140°F (60°C) and 200°F (93.3°C). Class IIIA is a subclass
of Class III liquids.
Class IIIB
A combustible liquid with a flash point at or over 200°F (93.3°C). Class IIIB is a subclass of Class III liquids.
Closed Piping Systems
A piping system used to transport liquids that is sealed to prevent vapors. Limits amount of flowing air.
Closed piping systems help prevent fires due to flammable or combustible liquids.
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