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SOLID RUBBER MATERIAL PROPERTIES

 
MATERIAL EPDM NBR CR (Neoprene) SBR NR
Hardness range (ShA) 45º - 95º 70º 40º - 80º 60º - 75º 40º - 80º
Colour black, grey, brown, beige, white black black black black
Tensile strength (N/mm²) 6 - 13 4 - 14 5 - 15 4 - 15 5 - 15
Oil resistance low very good good low low
Petrol resistance low medium to very good (1) medium to very good (1) low non-resistant

Temperature stability

 (ºC) (2)

 -30 to +110 -20 to +100 -20 to +80 -20 to +80 -30 to +60
For shorter periods +150 +120 +100 +100 +70
Solvent resistance  (3) good good good satisfactory good
Lye resistance (4) good good good good good
Ozone resistance excellent low very good low low
General climate resistance excellent good very good good good

NOTES:

  1. Depends on type of petrol.

  2. Borderline values which can vary with composition of compound. If used permanently in borderline areas, material physical values can change. For such extreme application it is advisable to use special compounds.

  3. Some types of acid require compound adjustments.

  4. Depends on type of lye.