POLYISOPRENE Chemical Properties:  

Melting point:  64 °C

Boiling point:  122-142 °C(lit.)

Density:  0.92 g/mL at 25 °C

refractive index:  n20/D 1.521

Fp:  >230 °F

Storage temp.:  2-8°C

Form:  slab/chunk

Description:  Polyisoprene is the polymer known as natural rubber, although it can also be manufactured. The natural rubber latex is harvested from the rubber tree, Hevea brasiliensis. This substance has a variety of natural additives, such as proteins and sugars. The polymer from the natural latex is resistant to many solvents and also is easily processed. The synthetic form of this rubber is produced from a pure isoprene solution with a stereospecific isomer to produce the more commonly used cis-l,4 isomer. These rubbers are resistant to abrasion and most solvents and are commercially used in automobile tires, adhesives, and a variety of products that come in close contact with the general public. Their use in baby bottle nipples is a good indication of the extremely low toxicity associated with these elastomers.

Chemical Properties:  Natural rubber is the name applied to the polymer cis-1,4-polyisoprene obtained chiefly from the 4590 RUBBER, NATURAL latex of the Hevea brasiliensis tree.

Chemical Properties:  There are two main solvents for rubber: turpentine and naptha (petroleum). Because rubber does not dissolve easily, the material is finely divided by shredding prior to immersion. Natural rubber has been partially replaced by synthetics, particularly styrene–butadiene, as a generalpurpose rubber. High resilience, low heat buildup, and easy processing are particular advantages of natural rubber when it is often used in blends with synthetic polyisoprene and other elastomers. Natural rubber, alone and in combination with neoprene, has been rated highly for resistance to water, dimethyl sulfoxide, and some alcohols in a comparative test of glove materials; resistance to other solvents varied from good to poor. Polyisoprene supports combustion.

Uses:  Natural rubber is a vital, strategic, and irreplaceable raw material used in enormous quantities by the commercial, medical, transportation, and defense industries. At least 40,000 different products and over 400 medical devices contain natural rubber.

Definition:  The major component of natural rubber, also made synthetically. Forms are stereospecific cis-1,4and trans-1,4-polyisoprene.Both can be produced synthetically by the effect of heat and pressure on isoprene in the presence of stereospecific catalysts. Nat

Industrial uses:  Rubber is characterized as being a highly elastic or resilient material, and the natural product is obtained mainly as a latex from cuts in the trunks of the Hevea brasiliensis tree. The latex consists of small particles (averaging about 2500 ? units in diameter) of rubber suspended in an aqueous medium (at about 35% solids content). The system also contains about 6 to 8% nonrubber constituents, some of which are emulsifiers, naturally occurring antioxidants, and proteins.

  Natural rubber is used for making many types of articles. Because of its abrasion-resistant quality and low hysteresis in reinforced compounds, it is used in truck-tire tread stocks and in conveyor belts that which are employed in conveying abrasive material such as coal, crushed rock, ore, and cinders. In large tires, it has found application in carcass compounds because of the tack and building qualities of the raw polymer. It has also been used in carcass compounds because of the low heat buildup (low hysteresis) of the carcass compound vulcanizate during severe service conditions in tire usage.

Shandong Green Chemical CO.,LTD is the premium producer and supplier of chemical raw materials. Our main products are food and feed additives,  agrochemicals,daily chemicals, pharmaceutical intermediates, organic intermediates, surfactants, dyes, plant extracts, cosmetics raw materials, chemical auxiliaries and other basic chemical raw materials. We are furnished with sophisticated production experience and strict quality control system,and our entire production process is conducted in more strict compliance with ISO 9001:2000 quality management system from sourcing raw materials, processing, inspecting and after-sale services and others.

We have always kept cooperation and partnership with many more professional laboratories to improve our products. We own one-stop sales service team, professional client service team and production team, overcritical inspection team and experienced R & D team and far-sighted leader team. Our products are widely exported to many more and more countries and we are rewarded with wide acceptance and praise from our honored clients.

What makes us unique: premium quality, higher efficiency, professionality, one-stop services,integration capability, tenacity, integrity and honesty.

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10g/bag;  50g/bag;  100g/bag;  500g/bag;  1kg/bag;  1kg/bag;  25kg/bag;  25kg/drum; 50kg/drum;  75kg/drum;  100kg/drum;  200kg/drum;  20GP/20HC/40GP/40HC/45HC

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Our company can pack according to the customer required, otherwise will package as our factory.

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Note: Support send samples
Express support: Fedex, TNT, DHL, EMS, UPS, SF

We offer specialized logistic service including export declaration,customs clearance and every detail during shipment,this makes us able to offer you one-stop service from the order to the products transported to your hand.

We will try our best to satisfied you.
1. Tailor-made for every customers.
2. Third-party test for the products you demand.
3. Test your counter-samples and produce them for you.
4. Best discount for old customers.

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