Flammable and Combustible Liquid Storage

Properly Store Flammable and Combustible Material Classifications
Ensure prevention of safety-related incidents with flammable and combustible liquids with NFPA 30 compliance. 

Careful consideration should be given to the unique chemical properties of flammable and combustible classifications and their storage compliance with NFPA 30. 

Man in protective gear storing hazardous chemicals in a U.S. Hazmat storage locker.

EPA, OSHA, & NFPA 30 Compliant Storage


Flammable liquids are potentially volatile substances that have a flashpoint below 100 degrees Fahrenheit. The lone exemption to this low temperature threshold is any chemical combination in which 99 percent of the elements has a flashpoint of 100 F or higher. By definition, the flashpoint is the minimal temperature at which a flammable liquid will emit a chemical aerosol sufficient to spark briefly when exposed to a flame.

Class I Flammable Liquids

Class I Liquids are flammable liquids in terms of their NFPA classification. This classification is separated into the following three categories based primarily on the flash point of the liquid. The flash point of a liquid is the minimum temperature at which sufficient vapors can form an ignitable mixture in the air from the stored liquids.

CLASS IA Flammable Liquids

Any liquid with a flashpoint below 73 F, or 22.8 C, and a boiling point below 100 F meets the minimal criteria for this volatile classification. Oxide, methyl chloride and pentane are common examples.

CLASS IB Flammable Liquids

Acetone, ethyl alcohol and gasoline, or any other liquid substance with a flashpoint below 73 F and a boiling point of at least 100 F meet the criteria for this classification.

CLASS IC Flammable Liquids

Flammable liquids with the unique physical properties of having flashpoints above 73 F or 22.8 C and below 100 degrees Fahrenheit meet this classification. Turpentine and Xylene are common examples.


Combustibles, or liquids with a flashpoint of at least 100 degrees Fahrenheit or 37.8 °C, are divided into two classes.

CLASS II Combustible Liquids

Chemicals such as kerosene, as well as many oils and solvents, that have flashpoints that reach a minimal 100 degrees Fahrenheit, 38 Celsius, and below 140 Fahrenheit, meet this basic criterion. The lone exemption to this principle, however, is any chemical combination of which 99 percent of the total volume of said combination possesses elements with flashpoints of 200 F (93.3 C) or higher.

CLASS III Combustible Liquids

This classification is reserved for liquids with flashpoints that reach a minimal of 140 F, or 60 degrees Celsius.

Class III Combustibles are differentiated by two categories:

Class IIIA Combustible Liquids

Flammable liquids with flashpoints of 140 F (60 Celsius), but below 200 F, or 93.3 Celsius. The lone exemption to this principle, however, is any chemical combination of which 99 percent of the total volume of said combination possesses elements with flashpoints of 200 degrees Fahrenheit or higher. Mineral spirits is a common example.

Class IIIB Combustible Liquids

Any liquid with a flashpoint of at least 200 degrees Fahrenheit. Examples include any lubricating oil or brake fluid.

EPA Compliant icon
OSHA compliant icon
NFPA Compliant icon


Complete our quick quote for a chemical storage building from US Hazmat Rentals, to request complete product specifications, or speak with a chemical storage specialist ready to assist you with your storage needs. Be sure to ask about long-term rental discounts. Our factory representative will be happy to answer any questions and provide hassle a free quote for your next project.

Free Hazmat Storage Planner

Download a free Chemical storage planner and building specification guide to hazardous material storage buildings. The US Hazmat Rentals planner will help make you aware of our storage options for proper chemical storage compliance. Each custom engineered building or storage locker is designed and engineered to meet or exceed OSHA, EPA, and NFPA regulations and are ready to deliver. 

For your flammable and combustible liquid storage needs, rely on a rental building from US Hazmat!
Call us today for immediate delivery: 1-888-264-2449