Oil and Tear Resistant Csm Rubber for Seals

Product Description

 

Product Description

Chlorosulfonated Polyethylene (CSM or CSPE for short) is a synthetic rubber material with polyethylene as the main chain, prepared through a dual chemical modification process of chlorination and chlorosulfonation. Its molecular structure is fully saturated, the main chain is composed of the carbon-carbon single bond of polyethylene, and the side chain introduces chlorine atoms and chlorosulfonyl groups (-SOCl), which gives the material unique weather resistance, chemical resistance and wide temperature range adaptability. Since industrialized production by DuPont in 1952, CSM has gradually become one of the core materials in automotive, anticorrosion engineering, cables and other fields by virtue of its comprehensive performance advantages.

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In terms of chemical structure, the chlorine content of CSM is usually controlled at 25%-43%, the sulfur content is 0.8%-1.7%, and the molecular weight range is about 30,000 to 120,000. Industrial production mainly adopts the solution process: polyethylene is first dissolved in a solvent such as carbon tetrachloride, then chlorine is introduced for chlorination reaction, and then a mixture of chlorine and sulfur dioxide is introduced to complete the chlorosulfonation modification. The process requires precise control of the reaction temperature (80-120°C), gas molar ratio and reaction time to ensure the stability of the product properties. In recent years, environmental regulations have pushed the industry to explore green solvent alternatives, such as supercritical carbon dioxide or aqueous phase dispersion technology, to reduce the reliance on toxic solvents in traditional processes.

Product Parameters

The physical and chemical properties of CSM are outstanding. Its ozone aging resistance far exceeds that of natural rubber, withstanding 500 hours without cracking at 50pphm ozone concentration; UV resistance is also outstanding, with a tensile strength retention rate of more than 85% after 3,000 hours of accelerated QUV aging. In terms of chemical resistance, CSM can resist long-term erosion by strong acids (e.g., 50% sulfuric acid), strong bases (e.g., 40% sodium hydroxide), oils (ASTM 1# standard oils) and oxidizing media (e.g., 30% hydrogen peroxide). In terms of mechanical properties, the tear strength can reach more than 25kN/m, DIN abrasion is less than 100mm³, and the abrasion resistance is 60% higher than that of Nitrile Rubber (NBR).

In the automotive industry, CSM occupies an important position. Its high temperature and fuel permeability resistance make it an ideal material for fuel delivery hose and turbocharger cooling hose, for example, in the ethanol gasoline permeability test, the permeability of CSM hose can be less than 0.5g/m²-24h. In the field of new energy vehicles, when CSM is used for battery cooling line, it not only meets the requirements of UL94 V-0 flame retardant, but also can withstand the extreme temperatures ranging from -40ºC to 150ºC. Cycling. In addition, CSM shows excellent resistance to pulse fatigue in components such as brake system seals and suspension hydraulic pipes, and can withstand more than 500,000 pressure cycle tests.
 
Anti-corrosion engineering is another major application scenario for CSM. Heavy-duty anticorrosion coatings made of CSM are widely used in chemical equipment, offshore platforms and oil pipelines, with salt spray resistance of more than 1,000 hours, and coatings that remain intact in hot and cold cycles from -50°C to 120°C. For example, the CSM protective coating on an offshore oil platform showed no significant signs of corrosion after 10 years of seawater immersion. For example, the CSM protective coating on an offshore oil platform showed no significant signs of corrosion after 10 years of seawater immersion.CSM can also be used in combination with epoxy resins to form a multi-layer anticorrosion system that is both flexible and adhesive, which significantly extends the service life of the equipment.

 In the cable industry, CSM has become the preferred sheath material for nuclear, mining and high-voltage cables due to its excellent electrical insulation and flame retardancy. Its volume resistivity exceeds 1×10-15Ω-cm, and it has passed the 50kGy γ-ray irradiation test, which fully meets the standard requirements for safety cables in nuclear power plants. The flame-retardant grade of mining CSM cable sheath reaches IEC 60332-3 Cat A, which can effectively inhibit the spread of flame in the early stage of fire.

Project	Unit	FH-403	FH-503	FH-603	FH-703	FH-803	FH-903	FH-604	HT-48
Chlorine content	%	35+2	35+2	35+2	35+2	35+2	35+2	43+2	43+2
Sulfur content	%	1.0~1.5	1.0~1.5	1.0~1.5	1.0~1.5	1.0~1.5	1.0~1.5	1.0~1.5	1.0~1.5
Volatile matter	%≤	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
Tensile strength	MPaz≥	25	25	25	25	25	25	25	25
Elongation at break	%≥	450	450	450	450	450	450	450	450
Mooney viscosity	ML(1+4) 1009C	40~50	50-60	60~70	70~80	85~95	95~110	50~70	70~90

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