Natural Rubber (NR)

Usually, what we call natural rubber refers to the elastic solid material made from natural latex collected from the Brassica napus through coagulation, drying and other processing procedures.

The Brazilian rubber tree is native to the western region of Mara Yue in the Brazilian Amazon River Basin. It likes high temperature, high humidity, calm wind and fertile soil. It has been distributed in more than 40 countries and regions in Asia, Africa, Oceania, and Latin America, mainly planted in Southeast Asia.

Natural rubber is a natural polymer compound with polyisoprene as the main component. Its rubber hydrocarbon (polyisoprene) content is more than 90%, and it also contains a small amount of protein, fatty acid, sugar and ash.

Natural rubber finished products can be divided into standard rubber (SMR), smoked sheet rubber (RSS), latex (latex) and crepe sheet rubber (crepe).

Natural rubber refers to a polymer elastic material collected from plants and processed. In nature, there are about 2,000 kinds of plants containing rubber components, but the one that has industrial application value (that is, high rubber content, high yield, and high quality) and is easy to collect is Hevea brasiliensis. At present, more than 98% of the total global natural rubber production is harvested from the Brazilian rubber tree. At present, the most widely used is standard rubber (SMR), which accounts for more than 90% of natural rubber production. China's natural rubber production and consumption are now the fourth largest in the world.

Basic properties of natural rubber

1. Natural rubber is unsaturated rubber, which is easy to undergo vulcanization reaction with vulcanizing agent, oxidation and cracking reaction with oxygen and ozone, and poor aging resistance. It undergoes chlorination and bromination reactions with halogens, and cyclization reactions occur under the action of acids or catalysts.

2. Natural rubber has good physical and mechanical properties and high elasticity.

3. The raw rubber of natural rubber also has good elasticity at room temperature, but it will gradually soften with heating, and its plasticity will become better and better; when its temperature gradually decreases, it will slowly harden, and the temperature will drop to 0 ℃ , its elasticity is greatly reduced. When the temperature drops below -70~-73℃, it becomes as brittle as glass. The phenomenon that raw rubber becomes soft when heated and hard when cold is reversible, that is, it has thermoplasticity.

4. Natural rubber also has high mechanical strength and good resistance to flexural fatigue.

5. Natural rubber has small hysteresis loss, high tear strength, low deformation heat generation, excellent cold resistance and wear resistance, waterproof and air tightness, thermal insulation and electrical insulation properties;

6. The performance of alkali resistance and general acid resistance is good (but not resistant to concentrated acid and strong acid).

7. Natural rubber has excellent processing technology, and is easy to carry out plasticizing, mixing, calendering, extrusion, molding and pasting. Moreover, natural rubber is also easily soluble in organic solvents such as gasoline and benzene to make glue. Natural rubber can be vulcanized with ordinary sulfur.

Application scope of natural rubber

From the perspective of comprehensive performance, natural rubber is the best among rubbers. Natural rubber is often used to manufacture various non-oil hoses, tapes, rubber pads, rubber bladders and various miscellaneous parts, various vibration damping parts, electrical equipment insulators, medical and sanitary products, sporting goods and various daily necessities (such as raincoats). , rain boots, hot water bottle, etc.).

Natural Rubber Price Chart (Latest)

SMR rubber

SMR (Standard Malaysian Rubber) are natural rubbers graded by technical specifications, not by the conventional visual standards. These SMR rubbers represent very high quality, clean latex grades of natural rubber.

Standard Malaysian Rubber is technically specified natural rubber originated from coagulum or cup lump. Both SMR 10 and SMR 20 are frequently used in tyre and automotive industry as well as moulded and extruded rubber products.

Standard natural rubber is classified according to the standard natural rubber classification method, and is classified by physical and chemical properties such as impurity content, nitrogen content, volatile content, ash content, color index, plastic initial value and plastic retention rate. According to this classification method, whether it is smoked sheet rubber, air-dried rubber or granular rubber, it is called international standard natural rubber, referred to as standard rubber 2. According to the different raw materials, it can also be divided into latex grade standard rubber and miscellaneous rubber grade standard rubber.

Natural rubber latex

Natural latex is a viscous milky white liquid with an appearance like milk. It is a milky water dispersion of rubber particles in a near-neutral medium. In the air, due to the action of oxygen and microorganisms, the lactic acid degree of the rubber increases, and it can be recovered within 2-12 hours. Natural coagulation, in order to prevent natural coagulation, a certain amount of ammonia solution should be added as a protective agent. Natural latex belongs to the thermoplastic synthetic resin of rubber, which is characterized by high elasticity, good film-forming performance during bonding, and the film is rich in flexibility, so the film has excellent flexural resistance, shock resistance and creep resistance. , suitable for the bonding of dynamic components and the bonding between materials with different thermal expansion coefficients.

Natural rubber sheet

Natural rubber sheets have good physical properties in general, such as good abrasion re-sistance, flexibilities and high strength.

Natural rubber sheets are widely used in substations, power plants, power distribution rooms, laboratories, and live work in the field.

Natural rubber sheets should be stored in a dry and ventilated environment, away from heat sources and more than 20cm away from the ground and walls. Avoid being polluted by acid, alkali and oil, do not open to avoid direct sunlight.

Natural rubber sheet for sale

We are professional manufacturer of natural rubber sheet with our own brand Hyrubbers. Our natural rubber sheet have passed the certification of ISO 9001:2000 quality management system, And have been exported natural rubber sheet to south America, Europe, Southeast Asia, Middle east more than 20 countries and regions.

Natural rubber production process

Tapping - latex handling and coagulation - thinning and creping - granulation - drying - briquettes

Natural rubber degradation

Rubber itself is not degradable. Many degraded rubbers are now due to the addition of degradants. Natural rubber or products will be degraded under complex conditions such as high temperature environment and hot air, and the elastic properties of rubber will be lost by cracking. The natural degradation of natural latex takes three months.

Synthetic Rubber (SR)

Synthetic rubber, also known as synthetic elastomer, is a highly elastic polymer synthesized by man. Synthetic rubber uses petroleum as the main raw material and is made by chemical methods.

Synthetic rubber is relative to natural rubber, which generally refers to rubber or elastomer synthesized by chemical methods. In practical applications, it is divided into two categories: general-purpose rubber and special rubber according to the characteristics of use.

General-purpose rubber refers to rubber that can partially or completely replace natural rubber, such as styrene-butadiene rubber, isoprene rubber, butadiene rubber, etc. It is mainly used in the manufacture of various tires and general industrial rubber products. General-purpose rubber is in great demand and is the main variety of synthetic rubber.

Special rubber refers to the rubber with the characteristics of high temperature resistance, oil resistance, ozone resistance, aging resistance and high air tightness. Ester rubber, polyurethane rubber and butyl rubber, etc., are mainly used in special occasions requiring certain characteristics.

Six categories of synthetic rubber

Styrene-butadiene rubber (SBR)

Styrene-butadiene rubber (SBR), obtained by copolymerization of butadiene and styrene, can be divided into emulsion-polymerized styrene-butadiene rubber and solution-polymerized styrene-butadiene rubber, with good comprehensive performance and chemical stability. The processing performance and the use performance of the products are close to natural rubber, and the wear resistance, heat resistance, aging resistance and vulcanization speed are better than those of natural rubber. It can be used together with natural rubber and various synthetic rubbers. It is the largest variety of general-purpose synthetic rubber in the fields of production of wires and cables, medical equipment and various rubber products.

Isoprene rubber (IR)

Isoprene rubber (IR), a rubber synthesized from isoprene, is the closest to natural rubber, and its water resistance and electrical insulation exceed natural rubber. Because its structure and properties are similar to natural rubber, it is also called synthetic natural rubber.

Butadiene rubber (BR)

Butadiene rubber (BR), produced by the polymerization of butadiene, is the second largest synthetic rubber after styrene-butadiene rubber. Compared with other general-purpose rubbers, the vulcanized butadiene rubber has excellent cold resistance, wear resistance and elasticity, less heat generation under dynamic load, and good aging resistance. It is easy to be used with natural rubber, neoprene, nitrile rubber, etc. Butadiene rubber is especially suitable for the manufacture of automobile tires and cold-resistant products, as well as cushioning materials and various rubber shoes, tapes, tapes and sponge rubber.

Chloroprene rubber (CR)

Chloroprene rubber (CR), produced by the polymerization of chloroprene. It has good comprehensive performance, oil resistance, flame resistance, oxidation resistance and ozone resistance. Has high tensile strength, elongation and reversible crystallinity, good adhesion. However, its density is high, it is easy to crystallize and harden at room temperature, its storage property is not good, and its cold resistance is poor.

Nitrile-butadiene rubber (NBR)

Nitrile-butadiene rubber (NBR) is obtained by copolymerizing butadiene and acrylonitrile. Excellent oil resistance, high wear resistance, good heat resistance, strong adhesion, can be used in air at 120 degrees Celsius or in oil at 150 degrees Celsius for a long time. In addition, it has water resistance and air tightness. The disadvantages are poor low temperature resistance, poor ozone resistance, poor insulation and slightly lower elasticity. Nitrile rubber is widely used to make various oil-resistant rubber products, various oil-resistant gaskets, gaskets, casings, soft rubber hoses, cable rubber materials, etc.

Ethylene propylene rubber (EPM/EPDM)

Ethylene propylene rubber (EPM/EPDM): It is a synthetic rubber with ethylene and propylene as the main monomers. According to the different composition of the monomers in the molecular chain, there are ethylene propylene diene rubber and ethylene propylene diene rubber. Widely used in automotive parts, waterproof materials for construction, wire and cable jackets, heat-resistant hoses, tapes, automotive seals, lubricant additives and other products.

Synthetic rubber price chart (Latest)

Synthetic rubber HS code

Synthetic rubber sheet for sale

We are known as one of the best quality manufacturers of the synthetic Rubber Sheet in China.

We have advanced production equipment and technologies, and the products produced are of high quality and excellent performance. Provide our customers with rubber sheets of high quality and good price.

What are the advantages and disadvantages of natural rubber sheet and synthetic rubber sheet?

The biggest advantage of natural rubber sheet is that it has a low degree of environmental pollution, and is easy to manufacture and wear-resistant. But the disadvantage is its high cost and limited production.

Synthetic rubber sheet has good performance in all aspects, and has insulation and high temperature resistance. The disadvantage is that the stretching effect is relatively poor and the environmental pollution is very large.

To sum up, natural rubber sheet and synthetic rubber sheet have their own advantages and disadvantages, and customers can purchase according to their different needs.