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NR - Natural Rubber (NR)

Clwyd referenceNR
ASTM classificationNR

Natural Rubber (NR) has the widest range of hardnesses, very strong and extremely resilient. Applications include those requiring strength and resistance to abrasion, sealing and shock absorption.

Typical applications
  • Components which are protected from constant air changes – i.e. inside machinery – and which do not come into contact with any oil or oil based fluids
  • Applications requiring strength and resistance to abrasion
  • Sealing and shock absorption
Advantages
  • Widest range of hardnesses
  • Very strong (naturally self-reinforcing) and extremely resilient
  • Good compression set
  • Good resistance to inorganic chemicals
  • Very good deformation capacity
  • Good flex fatigue resistance
  • Very good abrasion resistance
Disadvantages
  • Lack of resistance to oil and organic fluids
  • Relatively low maximum temperatures (75°C continuous, 100°C intermittent)
  • Poor ozone resistance, with tendency to perish in open air (can be improved to some extent by careful compounding).
Available hardness range (Shore A)30 - 95
Upper continuous service temp.80°C
Min. temp. for sealing applications-40°C
Minimum non-brittle  temp. -70°C
Tensile strength (up to)25 MPa
Elongation at break (up to)600%
Price BracketVery low
ASTM 1 OilNone
ASTM 2 OilNone
ASTM 3 OilNone
KeroseneNone
Liquid BNone
Liquid 101None
Phosphate esterGood
KetoneNone
TolueneNone
Iso-octaneNone
MethanolExcellent
Acid (weak)Average
Acid (strong)None
Base (weak)Good
Base (strong)None
Hydrogen sulphideNone
SteamNone
OzoneNone
RadiationAverage

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