Gaskets and seals may be evaluated for environmental conditions specific to certain end-use applications. Below is a list of some of the environmental conditions in ANSI/UL 157, Gaskets and Seals. Gaskets and seals can also be evaluated with respect to additional environmental conditions specified in end-product standards.

CODE END-USE APPLICATION
A Extinguishing agents
B Gasoline
C Gasoline/Alcohol blends up to 15% alcohol
D Naptha or kerosene
E MPS gas
F Manufactured gas or natural gas
G Diesel fuel, fuel oil or lubricating oil
H Heated fuel oil
I Anhydrous ammonia
J Liquefied petroleum gas (LP-gas)
K Dry-cleaning agents
L Laundry detergents
M Dishwashing detergents
N Atmospheric ozone
O Generated ozone