Usage examples (32)

• All of the others are doing well with their noncombustible roofs.
• So that does indicate that those noncombustible roofs are very helpful.
• Coal dust can mix with the rock dust in the normal course of mine operations, but regulations require that a majority of the dust remain noncombustible.
• Safety officials investigating the Massey Energy coal-mine explosion said most dust samples from the mine had insufficient levels of noncombustible material.