Natural rubber is mainly classified according to the manufacturing method, and in each category, it is classified according to the quality level or the different raw materials. Jiangyin Tianrun Rubber & Plastic Electrical Appliance Co., Ltd. is a professional company that produces and sells silicone rubber products, silicone rubber self-adhesive tape, silicone rubber tube, silicone tape, silicone self-adhesive tape, and self-adhesive tape.
The classification of natural rubber is as follows:
Rubber produced by Hevea rubber trees-1. General purpose-(1) Granular rubber
(2) Smoke sheet glue
(3) Air-dried sheet glue
(4) Crepe rubber
2. Special types----(1) Constant-viscosity rubber, oil-extended rubber
(2) Low-viscosity rubber, clear rubber
(3) Easy-to-handle rubber, carbon black co-precipitating rubber
(4) Purified rubber, clay co-precipitation
(5) Tire rubber, bulk rubber
3. Modified category-(1) difficult to crystallize rubber, epoxidized rubber, chlorinated rubber
(2) Graft rubber, liquid rubber, hydrochlorinated rubber
(3) Cyclized rubber, thermoplastic rubber
Rubber from other plants-1. Silver chrysanthemum rubber
2. Eucommia rubber
There are two classification methods for general natural rubber: one is to classify according to the appearance quality, such as smoked sheet rubber and crepe rubber, which are classified according to this method; the other is classified according to physical and chemical indicators, this method is more scientific, general granular rubber It is graded in this way.
Smoked sheet glue has a production history of more than 80 years. It is graded by appearance quality. my country's national standards are divided into grades 1, 2, 3, 4, and 5. The first-level quality is high, and the quality will gradually decrease in the future. For example, it is required that the film has no mold, no oxidation spots, no smoke impenetrable, no excessive smoke, no opacity, etc. The second-grade smoked sheet glue can allow the film to have a small amount of dry mold, slight glue rust, no oxidation spots and smoke impermeable glue. All levels of tobacco sheet glue have standard glue samples for easy reference. The packaging of tobacco sheet glue is relatively large and inconvenient to use. The internationally stipulated package weight is 102~114kg and the volume is 0.14 cubic meters. The plastic bag must indicate the tobacco sheet glue, grade, factory name, production date and other signs.
Crepe rubber can be divided into latex crepe and mixed crepe due to different raw materials and manufacturing methods. The quality of each medium is divided into different levels.
Standard rubber or granular rubber is a new variety of natural rubber developed in the 1960s. In the past, common smoke sheets, crepe sheets, and air-dried sheets were the traditional products that restrained the development of natural rubber in terms of classification methods and manufacturing methods. Therefore, Malaysia began to implement the standard rubber plan in 1965, and developed the production of granular rubber based on the physical and chemical properties of raw rubber. Standard rubber refers to rubber that is classified according to physical and chemical performance indicators such as mechanical impurities, plastic retention, initial plasticity, nitrogen content, ash content, ash content, and color index. Standard rubber packaging is also more advanced. Generally, polyethylene film is used for packaging and has a distinctive logo. The weight of the bag is small and it is easy to move. Malaysia’s packaging weight is 33.3kg, and my country’s regulations are 40kg.
The grading of standard rubber is more scientific, so this grading method was quickly accepted by the major natural rubber producing countries and international standardization agencies, and the grading standards for standard rubber have been formulated successively. These standards are roughly the same, but they are not entirely consistent. For example, ISO2000 stipulates five grades, and my country's standard GB8081-87 stipulates four grades.
The above-mentioned is the natural rubber of the adopted varieties, they are used in a large amount and have a wide range of applications. Before the appearance of the standard glue, the amount of smoked sheet glue was large, but now the amount of standard glue is large.
Other special rubbers and modified natural rubbers, such as constant-viscosity rubber, low-viscosity rubber, easy-to-handle rubber, purified rubber, tire rubber, clear rubber, difficult-to-crystallize rubber, carbon black co-precipitation rubber, clay co-precipitation rubber, graft Natural rubber, epoxidized natural rubber, cyclized natural rubber, etc., each have special properties and uses, but the amount is small.
