Radiological & Environmental Management Division of Environmental Health and Public Safety

Flammable and Combustible Liquids

Storage Requirements

Not more than ten (10) gallons of combined Class I plus Class II liquids should be outside of an approved flammable storage container. This means that 10 gallons can be out and everything else must be in a flammable storage cabinet or properly functioning safety cans.

A flammable storage cabinet may be minimally vented and only via the provided bung(s). In addition, any venting must be approved by Fire Protection and Special Services. Any flammable cabinet that has been cut into will not be approved and must be removed from service.

Link: Common Class I, Class II, and Class III Liquids


Flammable Liquid Classes (NFPA* 30)

Flammable Liquids
ClassFlash Point (FP)Boiling Point (BP)
IA FP < 73° F (22.8° C) BP < 100° F (37.8° C)
IB FP < 73° F (22.8° C) BP ≥ 100° F (37.8° C)
IC 73° F (22.8° C) ≤ FP < 100° F (37.8° C) NA
  • Class IA flammable liquids have a flash point less than 73° F (22.8° C) and a boiling point less than 100° F (37.8° C).
  • Class IB flammable liquids have a flash point less than 73° F (22.8° C) and a boiling point greater than or equal to100° F (37.8° C).
  • Class IC flammable liquids have a flash point greater than or equal to 73° F (22.8° C) but less than 100° F (37.8° C).

  *NFPA = National Fire Protection Association


Combustible Liquid Classes (NFPA 30)

Combustible Liquids
ClassFlash Point (FP)
II 100° F (37.8° C) ≤ FP < 140° F (60° C)
IIIA 140° F (60° C) ≤ FP < 200° F (93° C)
IIIB 200° F (93° C) ≤ FP
  • Class II combustible liquids have a flash point greater than or equal to 100° F (37.8° C) but less than 140° F (60° C).
  • Class IIIA combustible liquids have a flash point greater than or equal to 140° F (60° C) but less than 200° F (93° C).
  • Class IIIB combustible liquids have a flash point greater than or equal to 200° F (93° C).

 


Common Class I, Class, II and Class III Liquids

Properties of Common Class I, Class II, and Class III Liquids
ClassLiquidApproximate 
Flash Point 
(oC)
Approximate 
Normal Boiling Point 
(oC)
IA Diethyl Ether -45 35
IA n-Pentane -40 36
IA Propylene Oxide -20 (Open Cup) 35
IB Acetone -18 56
IB n-Hexane -7 69
IB Ethyl Acetate -4 77
IB n-Heptane -4 98
IB Acetonitrile 5 82
IB Methanol 11 65
IB 2-Propanol 12 82
IB Ethanol 13 79
IB n-Octane 13 125
IB 1-Propanol 21 97
IC n-Nonane 31 151
1C 1-Butanol 34 118
1C 2-Butanol 37 98
II Acetic Acid 39 118
II Propionic Acid 52 141
IIIA Butyric Acid 72 (Closed Cup) 164
IIIA Phenol 79 (Closed Cup) 182
IIIB Ethylene Glycol 111 198
IIIB Benzyl Alchol 93 204

Campus Safety Contacts

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Purdue Police
Phone: (765) 494-8221

Purdue Fire
Phone: (765) 494-6919

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Carol Shelby, Senior Director

Phone:
(765) 494-7504
Email: 
cshelby@purdue.edu
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