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Polyacrylate & Ethylene Acrylate Rubber

Polyacrylate (ACM) & Ethylene Acrylate (AEM) consist of polymerised ester and a curing monomer and are M-Group elastomers.

What is ACM/AEM?

ACM (polyacrylate rubber) consists of a polymerised ester and a curing monomer and being an M-Group elastomer has a saturated backbone coupled with polar side groups in the molecular structure. This results in excellent resistance to heat, ozone and hot oils and makes it significantly better than NBR materials. However, resistance to water, acids, alkalis and glycols is poor, whilst low temperature flexibility and physical strength (including resistance to compression set) is only fair. AEM (ethylene acrylate rubber) is a similar material with slightly improved high and low temperature capability, but poorer overall chemical resistance and at an increased cost.  

 

Why use ACM/AEM?

The improved hot oil resistance capability (compared to an NBR material) will often justify the slightly higher cost of an ACM seal. In applications where additives (such as sulfur) are used in the lubricating oils, ACM can be a cost effective solution compared to more expensive M-Group rivals (such as FKM). It can also be preferred over silicone based materials for some hot air applications. If the application is exposed to ozone and the atmosphere, the improved resistance to ageing that ACM offers can give substantial lifetime advantages.

Mouldings Garkets 2 Mouldings Garkets 2

When to use ACM/AEM

ACM is an ideal choice in the automotive industry for “under bonnet” applications, where the high temperature and hot oil resistance is significantly better than NBR options for a modest increase in cost, and well below the substantial cost increase associated with FKM alternatives. Use within the engine and gearbox lubrication systems is common, whilst water and glycol based fluid resistance is poor and exposure to these fluids should be avoided. General temperature capability is -20°C (-4°F) to +177°C (+350°F) but as with most elastomers special formulations can extend this, and lower temperatures of -35°C (-31°F) can be achieved.

Standard ACM/AEM materials

This is a small selection of our general purpose ACM/AEM materials. Many more compounds are available and can be chosen to suit the specifics of the application.

The tensile strength and elongation are for specification purposes. Typical achieved values can be significantly higher.

Temperature range  is general recommendation for static application in air. Temperature ratings are subject to full application review.

Ceetak code
Material group
Hardness
(Shore A)
Colour
Tensile Strength
MPa min
Elongation at Break
% min
Recommended operating
temperature range
Callout ASTM D2000
A55C819
ACM
55
Black
9
200
-20°C to +150°C
M2 DH 609 A26 B36 EO16 EO36 C12 Z1
A70CD66
ACM
70
Black
6
100
-20°C to +150°C
M5 DF 706 A26 B16 EO16 EO36
A80CD40
ACM
80
Black
8
125
-20°C to +150°C
M2 DH 808 A26 B16 EO16 EO36 Z1
AE70CD10
AEM
70
Black
10
200
-30°C to +150°C
M4 EE 710 A47 B46 B37 EA14 EO16 EO36 G21
AE75CD37
AEM
75
Black
10
150
-30°C to +150°C
-----------------------------------------------------
VAMCC52
AEM
60
Black
12
300
-40°C to +150°C
M3 EE 612 A26 B37 EO16 F17

Want to Know More?

To discuss our materials further and get support with material selection for your application, please contact one of our application engineers.

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