Miscellaneous Hazardous Material:

The miscellaneous hazardous material that “presents a hazard during transportation,” but doesn’t fall under any other hazard class. This class includes:

1. Material which has an anesthetic, noxious or other similar property which could cause extreme annoyance or discomfort to a flight crew member to prevent the correct performance of assigned duties. E.g.: Flight crews, i.e., flight attendants, bursars, pilots, flight engineers, etc.
2. Material that are hazardous substances or wastes and marine pollutants, and elevated temperature materials. Elevated temperature materials apply to liquids at a temperature at or above 100 °C (212 °F) or a liquid phase material with a flashpoint at or above 38 °C (100 °F) that is intentionally heated or a solid phase material at a temperature at or above 240 °C (464 °F).

E.g.: Acetaldehyde ammonia, Ammonium nitrate fertilizers, Asbestos, Aviation regulated liquid, Automobile airbags, Battery-powered equipment, Carbon dioxide, solid or Dry ice, Cotton, Lithium batteries, Plastic molding compound etc.