Composition of natural rubber sheets

In general, natural rubber is made from the latex of trefoil trees. 91% to 94% of natural rubber's main components are rubber hydrocarbons, and the rest are non-rubber substances such as proteins, fatty acids, ash, and sugars. Natural rubber is the most widely used in general rubber types.

Natural rubber is made from latex and has a part of non-rubber component, which remains in the solid natural rubber as the latex solidifies. In natural rubber, the rubber hydrocarbon content is about 92% to 95%, and the non-rubber hydrocarbon content is about 5% to 8%. Of course, due to the difference in the production process, method, place of origin and the season of picking, there will be subtle differences in the proportions of the various components, but they are basically within the above range.

The protein in natural rubber promotes the vulcanization of rubber and delays the aging of rubber. The protein also has strong water absorption, thus increasing the waterproof and moisture resistance of the rubber sheet.

There are some high-grade fatty acids and sterols in natural rubber, which have certain anti-aging effects, and some play the role of softening the raw rubber.

There is a small amount of ash in natural rubber, mainly composed of magnesium phosphate and calcium phosphate, and a small amount of metal compounds such as copper, manganese and iron. Excessive amounts of metal ions can cause the rubber to age, so control their content.

The last thing to note is that the moisture in the raw rubber does not exceed 1%. This is because when the moisture content of the raw rubber is too much, it is easy to mildew, and it will affect the processing of the rubber to a large extent; there will also be a phenomenon that bubbles or sponges are easily generated during calendering, extrusion, and vulcanization.