NR (Natural caoutchouc) is a natural product which is extracted from rubber plants (Hevea brasiliensis). It has high tensile strength, elongation, cold flexibility and excellent dynamic properties.
The material is resistant against many acids and has good resistance against alkalis and alcohols. But the ageing and ozone resistance is poor with protective agents.
It is not suitable for the usage in combination with petroleum, oil, grease and high temperatures.