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Chemical Name:
IR;isoprened;Kraton[R];betapreneh;kinase InsR;NATSYN 2200;NATSYN 2205;NATSYN 2210;POLYISOPRENE;CD220 antigen
Molecular Formula:
Formula Weight:
MOL File:
Mol file


Melting point:
64 °C
Boiling point:
122-142 °C(lit.)
0.92 g/mL at 25 °C
refractive index 
n20/D 1.521
Flash point:
>230 °F
storage temp. 
CAS DataBase Reference
Indirect Additives used in Food Contact Substances
175.105; 177.1010; 177.2600
EWG's Food Scores
EPA Substance Registry System
1,3-Butadiene, 2-methyl-, homopolymer (9003-31-0)
  • Risk and Safety Statements
Signal word  Danger
Hazard statements  H226-H304-H312+H332-H315-H319-H335-H360FD-H412
Precautionary statements  P201-P210-P261-P280-P308+P313-P370+P378
Hazard Codes  T
Risk Statements  60-61-10-20/21-38
Safety Statements  24/25-7/9-45-36/37-16-53
RIDADR  UN 1307 3/PG 3
WGK Germany  3
RTECS  VL8020000

POLYISOPRENE price More Price(6)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 431257 Polyisoprene, cis average Mw ~38,000 by GPC, made from natural rubber 9003-31-0 100 g $79.1 2021-03-22 Buy
Sigma-Aldrich 182141 Polyisoprene, cis 97% cis-1,4 9003-31-0 100 g $136 2021-03-22 Buy
Sigma-Aldrich 651796 Negative photoresist I 9003-31-0 100ml $139 2020-08-18 Buy
Sigma-Aldrich 182168 Polyisoprene, trans pellets, 99+% trans-1,4 9003-31-0 50 g $155 2021-03-22 Buy
Sigma-Aldrich 431265 Polyisoprene, cis average Mw ~35,000 by GPC, made from synthetic rubber 9003-31-0 250 g $165 2021-03-22 Buy

POLYISOPRENE Chemical Properties,Uses,Production


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.
Polyisoprene structure

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.


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.

Production Methods

The latex of natural rubber is obtained from trees (Hevea brasiliensis); the actual monomer is isopentenyl pyrophosphate that has been formed by biosynthesis. Natural rubber contains low-molecular-weight impurities; small amounts of sugar, fatty acids, proteins, and trace metals all play an important part in processing.
Depending on the catalyst, rubber may undergo 1,2-; 3,4-; or 1,4- additional polymerization that leads to several isomeric structures.
Almost all commercial synthetic polyisoprenes are prepared from purified isoprene monomer by a solution process. A stereospecific catalyst, such as an Al–Ti Ziegler type, is required for direct polymerization to the cis-1,4 isomer.
The production of the finished polymer requires two separate manufacturing processes: (a) formation of the rawpolymer and (b) conversion of the polymer to the finished rubber product. The first step is similar to that of plastic production. Large-scale operations use bulk materials in an enclosed system.


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.

POLYISOPRENE Preparation Products And Raw materials

Raw materials

Preparation Products


Global( 57)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Shaanxi Dideu Medichem Co. Ltd
029-88380327 CHINA 4105 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 22607 55
Hangzhou FandaChem Co.,Ltd.
+86-571-56059825 CHINA 8909 55
career henan chemical co
13203830695 0086-371-86658258
0086-371-86658258 CHINA 29864 58
Shaanxi Dideu Medichem Co. Ltd
029-88380327 CHINA 3993 58
Shaanxi Dideu Medichem Co. Ltd
+86-29-88380327 CHINA 3949 58
Shaanxi Dideu Medichem Co. Ltd
029-88380327 CHINA 3979 58
Chemwill Asia Co.,Ltd. 86-21-51086038
86-21-51861608;;; CHINA 23975 58
Beijing HuaMeiHuLiBiological Chemical 010-56205725
010-65763397 China 12341 58
Chizhou Kailong Import and Export Trade Co., Ltd. Please Email
- China 9550 50

View Lastest Price from POLYISOPRENE manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
US $1.00-1.00 / KG 1g 99% 50tons Shaanxi Dideu Medichem Co. Ltd
2020-04-23 Isoprene rubber
Isoprene rubber
US $1.00 / KG 1KG 99% 20T Shaanxi Dideu Medichem Co. Ltd
2020-02-26 Polyisoprene
US $0.00-0.00 / Kg 1KG 99.0%+ 1000 tons Shaanxi Dideu Medichem Co. Ltd

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