Noncombustible(Material) is defined as a material that, in the form used and under anticipated conditions, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat.

Noncombustible(Material) is defined as a material that, in the form used and under anticipated conditions, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat.

• A. A material that will ignite and burn.
• B. A material that, in the form used, will not ignite, burn, support combustion, or release flammable vapors, when subjected to fire or heat.
• C. A material that will burn slowly but not release smoke.
• D. A material that requires oxygen to burn.

Answer: (B)

The main idea is understanding what “noncombustible” means in practice: a material, in the form it will be used, under the expected fire or heat conditions, will not ignite, burn, support combustion, or release flammable vapors. The description that matches this exactly states that the material, in its used form, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. That’s why it’s the best choice. The other ideas describe materials that do burn or have combustion-related properties, so they don’t fit the noncombustible definition. For example, one describes a material that will ignite and burn, which is the opposite of noncombustible. Another says the material will burn slowly, which still means it is combustible. A description that indicates it requires oxygen to burn also implies the material can burn, which again conflicts with noncombustible behavior.

The main idea is understanding what “noncombustible” means in practice: a material, in the form it will be used, under the expected fire or heat conditions, will not ignite, burn, support combustion, or release flammable vapors. The description that matches this exactly states that the material, in its used form, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. That’s why it’s the best choice.

The other ideas describe materials that do burn or have combustion-related properties, so they don’t fit the noncombustible definition. For example, one describes a material that will ignite and burn, which is the opposite of noncombustible. Another says the material will burn slowly, which still means it is combustible. A description that indicates it requires oxygen to burn also implies the material can burn, which again conflicts with noncombustible behavior.