Chlorosulfonated Polyethylene (CSM) are made from high- or low-density polyethylene by chlorination and chlorosulfonylation, and exhibit excellent weather, heat, oil, fuel, ozone and UV resistance, and are properly formulated compounds offer good dynamic properties and strong adhesion to various substrates. It is widely used in the production of automotive parts, electric cable insulation, industrial rubber and other materials. cable insulation materials, industrial rubber products, and co-mingled modifications. It is used in the production of automotive parts, cable insulation, industrial rubber products and compounding materials.
Hypalon
Hypalon® is the trade mark of CSM. Hypalon was developed in 1951 and since then it has become the common name for chlorosulfonated polyethylene. It is a product of DuPont Performance Elastomers, a subsidiary of DuPont.
Discontinuation
Hypalon had specific formulation requirements that are now either legally restricted or avoided as a part of good design practice. Even though thermoset CSPE materials won’t melt in high-temperature environments, they will eventually ignite and burn. The gases produced during combustion of CSPE have varying levels of toxicity. Such toxic gases have been the subject of scrutiny in some segments of the industry. In addition, Hypalon often contains additives made from lead or lead compounds, a material well known for its dangers and restrictions.
The environmental pressures, high manufacturing costs, hazardous nature of manufacturing the product, as well as commercial pressures all probably contributed to DuPont’s decision to discontinue the production of their Hypalon products. With much consideration, they announced the discontinuation of Hypalon production at the end of June 2009.
What Are The Alternatives?
Chlorosulfonated Polyethylene (CSM) The production unit was built in 2008, and was subsequently renovated in 2011 with a capacity of 5000tons/year. Protection to use carbon tetrachloride solvent for the production of chlorosulfonated polyethylene (CSM).
Chlorosulfonated Polyethylene (CSM)
Grades | Chlorine content% | Sulfur content% | Mooney Viscosity ML(1+4) 100°C | Performances | Applications |
CSM3305 | 33~37 | 0.8~1.2 | 51~60 | Balanced physical and processing properties | automotive parts, rubber coating, industrial hoses, industrial hard rubber products |
CSM3304 | 33~37 | 0.8~1.2 | 41~50 | Low Mooney viscosity of CSM3305 |
CSM3308 | 33~37 | 0.8~1.2 | 81~90 | High Mooney viscosity of CSM3305 |
CSM4010 | 40~43 | 0.8~1.2 | – | Excellent solubility, low solution viscosity, good oil resistance | Coatings, adhesives, oil-resistant products, etc. |
CSM2300 | 23~27 | 0.8~1.2 | 41~50 | Thermoplastic, can be used in uncured state | Waterproof lining, rubber pool |
CSM2910 | 29~33 | 1.3~1.7 | – | Easily soluble in general organic solvents, good low temperature winding performance | Elastic substrates, fabrics, coatings, etc., and can be used with other polymers |
CSM4008 | 40~45 | 0.8~1.2 | 81~90 | Excellent chemical and oil resistance, good processability | Chemical and solvent resistant products, such as hoses, container linings, gaskets, etc. |
Key Applications of Chlorosulfonated Polyethylene (CSM)/ Hypalon
Good electricals, exceptional toughness and abrasion resistance, and a flexible cure mechanism make Chlorosulfonated Polyethylene (CSM) an excellent candidate for specialty wire and cable applications
Good dynamic properties and outstanding adhesion to substrates such as fabrics and brass coated steel make Chlorosulfonated Polyethylene (CSM) a unique choice for hose and belting.
Broad chemical and heat resistance over a range of temperatures along with exceptional toughness and abrasion resistance, make Chlorosulfonated Polyethylene (CSM) ideal for industrial roll coverings.
- Roofing Membrane/Pond Liner
Exceptional weather resistance; it is the material of choice for pond liners and specialty roofing.
- Other Applications
- Flexible Magnets
- Roofing Membranes
- Pond Liners
- Adhesives Seals
- Gaskets
- Diaphragms and other molded goods
