ANSI standards for hard hats set combustibility or flammability criteria. Some grades are characterized by their low flammability and low smoke emission. Its main hazard is its flammability. Specifically, when using HMIS III, which accounts for the increased flammability hazard of aerosols. The most hazardous property of acetone is its extreme flammability. The efficacy of thermal detonation is greatly limited by the flammability of some agents. Conventional upper and lower limits of flammability apply to such weapons. Flammability of materials is a consideration in furniture design. It has relatively low flammability and smoke generation. The ban remained however, so the engineers used only hydrogen despite its extreme flammability. It has practically no flammability at lower temperatures. A fire test can be conducted to determine the degree of flammability. During the investigation, the issue of the flammability of passengers' clothing materials was raised. Mylar is not used because of flammability concerns. One disadvantage is the high flammability, especially in conjunction with oxygen.