Natural Rubber (Polyisoprene)-HWA CHENG RUBBER INDUSTRY CO., LTD.

‧Natural Rubber (Polyisoprene)

The original natural material which has been in commercial use since the turn of the century. The most widely developed rubber with a huge range of compounds available. It also usually has the lowest price.
Natural rubber is an environmentally desirable material and comes from a naturally sustainable source.
During its production as a tree sap (latex), it constantly absorbs carbon dioxide
(a greenhouse gas) from the air. At the end of their working lives, the rubber trees are used to make furniture and are replaced with young trees for further production. Natural rubber itself is readily biodegradable and non-toxic.
Properties

widest range of hardnesses
very strong (naturally self-reinforcing) and extremely resilient
good compression set
good resistance to inorganic chemicals

Limitations

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).

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