The difference between natural rubber and compound rubber | Flange Gasket Rubber
Rubber materials have been a hot topic since 2021. Due to the high price of various rubber materials, due to the pressure of cost, all manufacturers are committed to research the alternative of rubber materials. So what is the difference between natural rubber and compound rubber? Let's follow our RSL rubber technical engineers to understand their differences.
Natural rubber is a kind of natural high molecular compound with polyisoprene as the main component. The molecular formula is (c5h8) n, 91% ~ 94% of which is rubber hydrocarbon (polyisoprene), and the rest is non rubber substances such as protein, fatty acid, ash, sugar and so on. Natural rubber is the most widely used general rubber. Compound rubber: compound rubber refers to rubber with natural rubber content of 95% - 99.5%, and a small amount of stearic acid, SBR, cis-butyl rubber, isoprene rubber, zinc oxide, carbon black or plasticizer are added to the rubber, which is compounded by mixing. Chinese Name: synthetic rubber English Name: synthetic rubber definition: high elastic materials with reversible deformation based on synthetic polymer compounds.
1、 Classification of rubber
Rubber is mainly divided into natural rubber, composite rubber and synthetic rubber.
Natural rubber and compound rubber are the main imported products; Synthetic rubber is extracted from oil, not considered for a while.
Natural rubber is the rubber made from natural rubber plants. The composite rubber is made by adding a little synthetic rubber and some chemical products on the basis of natural rubber.
Natural rubber is divided into standard rubber and cigarette rubber according to different manufacturing process. Standard rubber is standard rubber, such as standard rubber of China, SCR, SVR, STR, SMR, etc.
Standard glue also has different grades, such as SVR3L, SVR 5, svr10, svr20, SVR 50... And so on; According to the size of the number, the larger the number, the worse the quality; The smaller the number, the better the quality (the most important factor to distinguish the quality is the ash content and impurity content of the product, the less ash content, the better the quality)
Cigarette glue is a ribbon smoked sheet, which refers to the thin rubber made of smoke. It is abbreviated as RSS. This abbreviation is different from standard glue, and is not divided according to the origin. The expression method is the same in different places of origin
There are different grades of cigarette glue. RSS1, RSS2, RSS3, rss4, rss5, rss5, the same, RSS1 is the best quality, rss5 is the worst.
◆ compound rubber
It is made by adding a little synthetic rubber and some chemical products on the basis of natural rubber. The most common compound rubber formula is such as SMR compounded rubber 97% SMR 20 (Malaysia standard rubber) +2.5% SBR (SBR, a synthetic rubber) +0.5% stearic acid.
The compound rubber is called compound according to the nature rubber which is the most important component. As for the above, SMR 20 is the most important component of the compound rubber. Therefore, it is called Malaysia No. 20 standard rubber compound; There are also cigarette compound and standard glue compound.
2、 Different import standards of compound and natural rubber in China
The tariff of China on imported natural rubber is 20%, and that of compound glue is 0; This is also the reason why many factories and rubber traders buy compound rubber in large quantities.
3、 Rubber production and consumption market
The rubber producing area of the world is 90% in Southeast Asia, including Malaysia, Thailand, Vietnam, Cambodia, Indonesia, Myanmar, etc; Africa has a part, and China has only Yunnan and Hainan.
Natural rubber demand. The main consumption of natural rubber is in East Asia, the United States and Western Europe. East Asia is the world's largest consumer area. In 2002, China, Japan and Taiwan accounted for 30% of the global total consumption, accounting for almost one third of the world's total consumption. Among them, China accounts for about 18 percent of the total consumption, ranking the first in the world, while the United States is the second largest country in natural rubber consumption, and the third in Western Europe.
China's current rubber form is dependent on a large number of imports.
4、 Rubber use
Make tire, shoe, hose, tape, insulation and sheath of electric wire and cable, and other general products.
5、 The influencing factors of rubber price fluctuation
1. International economic environment
2. Supply and demand in international market
·Development of rubber industry
·Natural factors - rainy season, pest
·Exchange rate, policy factors, etc
Through the above knowledge, I believe that you have a certain understanding of 2 kinds of rubber. To learn more about rubber, rongshenglong provides various flange gasket rubber, please continue to pay attention to our RSL rubber, or log on our website