RUBBER TYPES

In these few pages devoted to rubber we shall sum up some characteristics and methods of employing rubber and its derivatives, without any pretension to a thorough scientific approach. Descriptions are going to be sketchy, but they may provide useful indications to people who are not well acquainted with such details; you shall therefore find a basic outline of the materials we most frequently utilize, the treatment they undergo and the products they are turned into, together with the applications for which they are suitable

Introduction

(an excerpt from a book by Khairi Nagdi, published in Italy by Tecniche Nuove as ‘Il Manuale della Gomma’)

lavorazioneRubber is definitely a peculiar material. Its most remarkable feature is its elasticity. You can stretch a rubber band until it becomes much longer than it was, yet it will not break; as you release it, it will immediately recover its original size and shape. Similarly, you can compress it, bend it or twist it; every time, once you leave it, it will take back its shape.

There are NO OTHER MATERIALS with the same degree of elasticity. This explains why rubber and rubber-like materials are called “ELASTOMERS“.
This, and countless other reasons, led

CHARLES GOODYEAR to say that:

“THERE IS NO OTHER SUBSTANCE WHOSE PROPERTIES CAUSE SO MUCH CURIOSITY, SURPRISE AND AMAZEMENT LIKE RUBBER”…..

TastSiElastomers also have a number of other valuable properties: most of them are hardly permeable to water and air and have good abrasion and tensile strength. Special types can even withstand temperatures in excess of 200°C. and even many of the most aggressive chemicals cannot eat into them. Other types preserve their elasticity at temperatures as low as about – 100°C.

The raw matter for making elastomers may be either NATURAL (Hevea) RUBBER or SYNTHETIC RUBBER. Rubber is then mixed with several chemical additives and hot cured (or ‘vulcanized’); cold curing is much less frequent.
Only after curing does the mixture acquire its typical elastic and mechanical properties such as strength, tensile strength and extensibility.



   

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