What type of waste are substances that are spontaneously combustible classified as?

Substances that are spontaneously combustible are classified as ignitable wastes because they have the potential to ignite and burn without the need for an external ignition source. This characteristic makes them particularly dangerous in handling and disposal, as they can pose significant fire hazards. Ignitable wastes can spontaneously catch fire at relatively low temperatures, which is a key factor in their classification under regulations governing hazardous waste management.

This classification is essential for ensuring that proper safety protocols are followed when dealing with such materials, including appropriate storage and transportation measures to mitigate the risk of accidental ignition. Understanding the nature of ignitable wastes is crucial for those involved in hazardous waste operations, as it directly impacts workplace safety and compliance with environmental regulations.