Polyacrylate (ACM) O-Rings

Polyacrylate (ACM) O-Rings Material Description

Polyacrylate (ACM) o-rings are copolymers of ethyl or butyl acrylate with a combination of chlorine, acid, amide or epoxy compounds. Optimal environments include engines and transmissions with good resistance to petroleum fuels and oils, automatic transmission fluid, type A power steering fluid. Good resistance to mineral oil, sunlight, oxygen, and ozone.

Engineered Seal Products has the expertise and inventory for your ACM o-ring applications. For over 50 years, ESP has been the leading engineering, quality, and supply chain choice for both standard and custom sealing applications. A seal, no matter the application, has to do just that.

Also Know As:

Europrene-AR®, Krynac®, Nipolar®, Hycar®, Cyanacryl®, Noxtite-PA®

Polyacrylate (ACM) Advantages:
  • Petroleum fuels and oils resistance
  • Automatic transmission fluid resistance
  • Type A power steering fluid resistance
  • High temp performance up to 350° F

Optimal environments: Engines and transmissions.

Polyacrylate (ACM) Disadvantages:

Cannot be used in:

  • Alcohol, alkalis, glycol based brake fluids, EP fluids, chlorinated hydrocarbons, gear oils, glycol based brake fluids, hydrocarbons, water or steam (above 275°F), acids and amines.
  • Typical formulations only good to -5° F

Lower water compatibility, cold flexibility, strength, and compression set resistance than nitrile.

Polyacrylate (ACM) Material Properties

Polyacrylate (ACM) Material Temperature Range:

Heat Resistance: Up to 300°F (149°C) with shorter life @ 325°F (163°C)

Cold Flexibility: Depending on individual compound, between -20°F and -40°F (-29°C and -40°C).

Normal Recommended Temperature Range Normal recommended temperature range

Extended Temperature Range Extended Temperature Range for short term only

PDF O-Ring Temperature Range Chart

Abrasion Resistance Good
Chemical Resistance Poor
Cold Resistance Poor
Heat Resistance Excellent
Oil Resistance Excellent
Ozone Resistance Excellent
Tensile Strength Fair
Water/Steam Resistance Poor

Material properties & Temp ranges based on Parker o-Ring Handbook (ORD 5700) recommendations.

Select a Material to Compare:

ASTM Designation
Shelf Life
15 Years
Hardness (Shore A) Range
40 - 90

Temperature ranges will apply to the majority of media for which the material is potentially recommended. With some media however, the service temperature range may be significantly different. ALWAYS TEST UNDER ACUTAL SERVICE CONDITIONS.

ESP’s shelf life recommendation is based on the ARP 5316 standard and intended to be utilized by those organizations who do not already have specific recommendations for the control of elastomeric seals. It should be noted that the packaging of the elastomeric seals prior to assembly into a product is an integral part of the controlled storage procedure. It provides a positive means of product identity from the time of manufacture, to the time of assembly.