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ASTM
D 1418 Designation: ACM
ASTM
D 2000, SAE J200 Type / Class: DF, DH
RELATIVE
COST: Medium
GENERAL
TEMPERATURE RANGE: -25° to +275° F
Polyacrylate is
a copolymer (ethyl acrylate, see Figure
38) which offers good resistance
to petroleum fuels and oils. Resistant to flex cracking,
polyacrylate also resists damage from oxygen, sunlight,
and ozone (due to main chain saturation).
For
low temperature applications, particular care must
be taken to ensure that the polymer used is cold
resistant; some polyacrylate polymers will crack
when flexed at temperatures of 0° F or lower.
Though it is marginally more resistant to hot air
than nitrile,
polyacrylate falls short in strength and compression
set resistance, as well as in resistance to
water and low temperatures. For these reasons,
polyacrylate is slowly being replaced by fluoroelastomers and
hydrogenated
nitriles (though both are more expensive).
ACM
PERFORMS WELL IN:
• Petroleum oils & fuels
• Automatic transmission
fluid
• Type A power
steering fluid
ACM
DOES NOT PERFORM WELL IN:
• Alcohol
• Alkalis
• EP fluids
• Gear oils
• Glycols
• Hydrocarbons
(aromatic, chlorinated)
• Water
MATERIAL
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