Elastomers

Elastomers

Carst & Walker (South Africa) has established itself as a significant agent and distributor of materials as well as offering technical support for these growing sectors, providing:

BR/SBR Rubber

Styrene-butadiene rubber (SBR) is one of the most versatile copolymer rubber compounds. It consists of the organic compound styrene and the chemical butadiene, with the amount of butadiene usually being about three times more than the amount of styrene. SBR is a stable synthetic rubber that is resistant to abrasion. It is used in a wide variety of products, such as automobile tires, children’s toys, shoe soles and even chewing gum.

SBR is produced either through ionic polymerization of a solution or as an emulsion through free radical polymerization. Also known as emulsion styrene-butadiene rubber (E-SBR). SBR is very cost-effective and is used to stretch dwindling natural rubber resources, especially in tire manufacturing.

Chlorinated Polyethylene

CPE is a high molecular synthetic material by chlorination of high-density polyethylene (HDPE) and it is also a type of thermoplastic elastomer. It has good heat resistance, whether ability, oil resistance, flame retardancy, chemical resistance, ozone resistance, etc. It can be both used for production of window profiles and pipes as an impact modifier for PVC rigid products, and for applications in industries of wires & cables and hose & tape by taking place of CR (chloroprene rubber) as a special rubber.

Chloroprene Rubber

Chloroprene rubber has many superior characteristics compared to natural and even other synthetic rubber types, so it has numerous applications. In particular, its possible uses have been expanded to civil engineering/construction and precision components as well. Our company meets such needs by providing a wide range of grades such as special denatured types, and latex best suited to making aqueous adhesives, etc.

Features

Chloroprene rubber demonstrates a good balance of features, including such as resistance to ozone, oil and heat; flame retardancy, weatherability, special cohesiveness, etc., and is very easy to process.

Use
  • Electrical wiring and cables
  • Automotive components
  • Belts, hoses
  • Coated cloth, foam rubber
  • General industrial articles
  • Adhesives, etc.
EPDM Rubber

PDM rubber is used in vibrators and seals; glass-run channel; radiator, garden and appliance hose; tubing; washers; belts; electrical insulation, and speaker cone surrounds. It is also used as a medium for water resistance in electrical cable-jointing, roofing membranes, geomembranes, rubber mechanical goods, plastic impact modification, thermoplastic, vulcanizates, and many other applications.

EPDM exhibits satisfactory compatibility with fireproof hydraulic fluids, ketones, hot and cold water, and alkalis, and unsatisfactory compatibility with most oils, gasoline, kerosene, aromatic and aliphatic hydrocarbons, halogenated solvents, and concentrated acids.

The main properties of EPDM are its outstanding heat, ozone and weather resistance. The resistance to polar substances and steam are also good. It has excellent electrical insulating properties.

Epichlorohydrin

Epichlorohydrins find use in a wide range of automotive, industrial and consumer applications. Compounds are easily fabricated into hoses, air ducts, rolls, diaphragms and seals.

Zetpol polymers find use in a wide range of applications. Automotive, oilfield and roll applications  represent the many of the markets for hydrogenated nitriles.

Fluoro Elastomers

C&W has access to the Daiken Dia-el range of thermoplastic fluoroelastomer.

These are blocked polymers in which part of the fluoroelastomer and fluoro resin are combined, and as at room temperature physical bridge formation(Para-bridging structure) is conducted in crystalline fluoropolymer phase, it shows rubber elasticity, but at high temperatures beyond fusion point, it shows the same liquidity as thermoplastic.

Therefore, molding and processing have polyphenic characteristics in which processing and molding resemble thermoplastic resin, and ordinary state the characteristics resemble fluoroelastomers, and chemical resistance resembles fluoroplymer, respectively.

We regularly stock the G-755 which is a copolymer fluoroelastomer of vinylidenefluoride and hexafluoropropylene, and curing agent ((bisphenol AF) and curing accelerator are incorporated.

Of all DAI-EL series, it is the grade with the highest heat resistance and compression set resistance. It is best-suited for O-rings and oil seals which require heat resistance.

HTV Silicone

Commercial Grade HTV Silicone rubber is a unique synthetic elastomer made from a cross-linked polymer which is reinforced with silica. Extremely durable UV and Ozone resistant, silicone rubber maintains a high temperature range. Applications include gaskets, seals, cable blocks, fuel seals, rollers and die cut parts.

Applications:

Commercial Silicone Gaskets, Industrial Seals, Vibration Pads, Thermal Management, General Silicone Use & Rubber Diaphragms. Silicone rubber works well as an electrical insulator for surge protectors and transmission and energy distribution substations. Commercial grade Silicone rubber is available in 30 thru 70 durometer. High temperature extents allow it be used in extreme high temperatures for extended periods of time. Can also be used in food processing applications.

Isoprene Rubber

Isoprene rubber is the abbreviation of polyisoprene rubber, a product by solution polymerization of synthetic isoprene. Isoprene rubber has good flexibility and wear resistance, excellent heat-resistance and chemical stability just like natural rubber.

Isoprene rubber can replace natural rubber for manufacturing of tyres. it is also used for producing other rubber products.

Natural Rubber

Natural rubber is obtained from a tropical tree, Hevea brasiliensis, originating in the Amazon Basin, which can be 30 m (90 feet) tall. Now, most rubber production comes from Southeast Asia (Malaysia and Indonesia), the rest from South America, west/central Africa.

C&W sources from most of these parts offering a wide selection of grades to include latex.

Nitrile Rubber

Nitrile Rubber is a synthetic rubber copolymer of acrylonitrile and butadiene, offering improved oil, fuel and chemical resistance compared to natural rubber and other synthetic rubbers. It is available in a number of supply forms, including bale, powder and liquid nitrile, catering for a variety of end applications.

Features

Nitrile rubber is typically used in applications where resistance to fuels, oils, solvents and other chemicals is a requirement. A higher acrylonitrile content results in improved oil, fuel and solvent resistance, whilst a higher butadiene content translates into improved low temperature flexibility and resilience. They can also be used for the modification of thermoplastics and thermosets, and in the production of adhesives.

Uses
  • Fuel hoses
  • Seals
  • Gaskets
  • Adhesives & sealants
  • Footwear
  • Gloves
  • Cable jacketing
  • Roller covering
Polyblends, PVC/Nitrile

C&W stock the Nantex range of NBR/PVC polyblends.

Dry blend of 100 Nancar® NBR, 60 PVC resins, and 120 DEHP. Outstanding ozone resistance.

Dry blend of 70 Nancar® NBR and 30 PVC resins. Outstanding ozone resistance.

Suitable for cable jackets, hose covers, automatic belts, roller and shoe soles.

Suitable for low durometer products, and rubber rollers.

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