Chlorosulfonated Polyethylene Rubber Hypalon

Chlorosulfonated polyethylene s)mthetic rubber (CSM) is manufactured by DuPont under the trade name H) alon. In many respects it is similar to neoprene, but it does possess some advantages over neoprene in certain types of service. It has better heat and ozone resistance, better electrical properties, better color stability, and better chemical resistance. 

Hypalon, when properly compoimded, also exhibits good resistance to wear and abrasion, good flex life, high impact resistance, and good resistance to permanent deformation imder heavy loading. 

Hypalon has a broad range of service temperatures with excellent thermal properties. General-purpose compounds can operate continuously at 

On the low-temperature side, conventional compounds can be used continuously down to 0 to — 20°F ( — 18 to — 28°C). Special compounds can be produced that will retain their flexibility down to — 40°F ( —40°C), but to produce such a compound, it is necessary to sacrifice performance of some of fhe ofher properties. 

---

Hypalon is chlorosulfonated polyethylene rubber DuPont Elastomers ... 

Hypalon chlorosulfonated polyethylene was introduced by Du Pont in 1952. Although not a high volume rubber it has found use in coatings and hoses. 

The chemical name for Hypalon is chlorosulfonated polyethylene and it has excellent resistance to heat, ozone and oxidising chemicals and has good abrasion resistance. It can be compounded for outstanding resistance to oxidising chemicals, such as sodium hypochlorite solutions in sulfuric acid saturated with chlorine and concentrated phosphoric acid. It is one of the few synthetic rubbers that can be mixed in any colour without loss in mechanical properties. 

In 1970, DuPont Introduced Hypalon A5, a thermoplastic grade of chlorosulfonated polyethylene synthetic rubber, for applications as a pond liner material. It was one of the first thermoplastic elastomers retaining easy seamablllty both in the fabrication plant and in the field, and possessing outstanding resistance to outdoor weathering. 

Low chlorination of polyethylene, causing random substitution, reduces chain order and thereby also the crystallinity. The low chlorine products (22-26% chlorine) of polyethylene are softer, more rubber-like, and more compatible and soluble than the original polyethylene. However, much of the market of such materials has been taken up by chlorosulfonated polyethylene (Hypalon, Du Pont), produced by chlorination of polyethylene in the presence of sulfur dioxide, which introduces chlorosulfonyl groups in the chain. 

Vulcanizates of this chlorosulfonated polyethylene synthetic rubber are highly resistant to ozone, oxygen, weather, heat, oil, and chemicals. Hypalon resists discoloration on exposure to light and is widely used in light-colored vulcanizates. 

Saturated polymers such as butyl and ethylene-propylene-diene terpolymer are more difficult to bond and generally exhibit lower bond strengths compared to those found with the general purpose polymers. Once a degree of functionality is introduced into the polymer such as with chloro or preferably bromobutyl rubber and chlorosulfonated polyethylene (Hypalon ) then the ability to bond is enhanced. 

Hypalon Chlorosulfonated polyethylene, manufactured by DuPont Performance Elastomers. A versatile, high-performance elastomer used extensively in the automotive and general rubber industries. 

The insulation system for pitched roofs usually provides the advantage of a continuous, homogeneous insulating layer with an economy in construction. Bitumen (asphalt) as well as its different versions modified with various polymers and a number of different roofing membranes, i.e., preformed or liquid applied sheets of PVC, terpolymer of ethylene-propylene-diene monomer (EPDM), chlorosulfonated polyethylene (Hypalon), PU, butyl rubber, polychloroprene (Neoprene) [36], all have been used as insulating layers. 

Chlorosulfonated polyethylene (CSM) [68037-39-8] describes a group of curable, halogenated olefin polymers, first introduced to the rubber industry by E. I. du Pont de Nemours and Co. in 1951 (1-5) under the trade name of Hypalon. They contain pendant chlorine and sulfonyl chloride groups and vary in consistency from soft and elastomeric to hard and plastic. The chemical structure may be represented by... 

Both natural and synthetic rubbers are used as elastomeric linings. The most commonly used synthetic elastomers are NBR (acrylonitrile-butadiene), Hypalon (chlorosulfonated polyethylene), EPDM (ethylene-propylene-diene monomer), EPT (ethylene-propylene-diene terpolymer), SBR (styrene-butadiene), and neoprene (polychloroprene). A maximum use temperature of nS F/SOX is typical. 

Charles R. Baddorf, Hypalon Chlorosulfonated Polyethylene and Ascium , Alkylated Chlorosulfonated Polyethylene lecture presented to The Chicago Rubber Group, Inc. February, 2003. 

The synthetic rubber chlorosulfonated poly-ethylene—(Hypalon —Du Pont Co., ceased operations April 20, 2010), also known as chlorosulfonyl polyethylene, introduced in 1952, is characterized by ozone resistance, light stability, heat resistance, weathering, resistance to deterioration by corrosive chemicals, and good oil resistance. Presently available types contain from 25% to 43% chlorine and... 

When two polymers interact or react with each other, they are likely to provide a compatible, even a miscible, blend. Epoxidized natural rubber (ENR) interacts with chloro-sulfonated polyethylene (Hypalon) and polyvinyl chloride (PVC) forming partially miscible and miscible blends, respectively, due to the reaction between chlorosulfonic acid group and chlorine with epoxy group of ENR. Chiu et al. have studied the blends of chlorinated polyethylene (CR) with ENR at blend ratios of 75 25, 50 50, and 25 75, as well as pure rubbers using sulfur (Sg), 2-mercapto-benzothiazole, and 2-benzothiazole disulfide as vulcanizing agents [32]. They have studied Mooney viscosity, scorch... 

---