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Appendix III

Appendix III

Appendix III Chemical-Resistant Properties and Hardness Ranges of Both Natural and Synthetic Rubbers Property Natural Rubber Butyl Rubber EPDM Ru...

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Appendix III

Chemical-Resistant Properties and Hardness Ranges of Both Natural and Synthetic Rubbers

Property

Natural Rubber

Butyl Rubber

EPDM Rubber

Chloroprene Rubber

Nitrile Rubber

Silicone Rubber

Chlorosulfonated Polyethylene Rubber

Hardness °A

40–100

40–90

40–90

30–90

45–100

40–80

40–80

Excellent

Good

Good

Very good

Excellent

Poor

Fair

Excellent Excellent

Excellent

Excellent

Excellent

Excellent

Abrasive resistance Room temperature aging

Good

Resistance to diffusion of gases

Fair

Excellent

Good

Excellent

Fair

Poor

Poor

Resistance to flexing

Excellent

Excellent

Good

Excellent

Fair

Poor

Poor

Resistance to petrochemicals and greases

Poor

Poor

Poor

Good

Excellent

Fair

Good

Resistance to vegetable oils

Good

Good

Good

Fair

Very good

Good

Good

Resistance to water and antifreezes

Good

Good

Very good

Fair

Good

Poor

Poor

Resistance to dilute acids

Good

Good

Good

Good

Fair



Good

Resistance to oxidizing agents

Poor

Fair

Fair

Poor

Poor

Poor

Very good

Continued

233

234

Appendix III

Chemical-Resistant Properties and Hardness Ranges of Both Natural and Synthetic Rubbers—Cont’d Natural Rubber

Butyl Rubber

EPDM Rubber

Chloroprene Rubber

Nitrile Rubber

Silicone Rubber

Chlorosulfonated Polyethylene Rubber

Resistance to alkalis

Fair

Fair

Fair

Good

Fair



Good

Processing characteristics

Excellent

Good

Good

Good

Good



Poor

Tear resistance

Excellent

Good

Good

Poor

Good

Property

Excellent Excellent

EPDM, Ethylene-propylene-diene-monomer. Note: Higher hardness of 100°A in natural rubber and nitrile rubber indicates that ebonite that can be made with approximately 50% of sulfur addition. • Ebonite cannot be made from butyl, EPDM, chloroprene, silicone, and chlorosulfonated polyethylene. • Silicone rubber has higher temperature resistance. • At room temperature natural rubber can be used for road tankers to handle 70% sulfuric acid. • Neoprene and chlorosulfonated polyethylene can handle pure and strong sodium hydroxide. • Chlorosulfonated polyethylene possesses superior resistance to oxidizing environments such as 90% sulfuric acid and 40% nitric acid at room temperature for short durations.

The chemistry, compounding, and vulcanization of all types of rubbers used for rubber lining applications are quite complex and information is not readily available to chemical engineers. The best practice is to discuss the chemical process with the rubber lining manufacturers and applicators to obtain a proper rubber selection for a given condition and the type of vulcanization, whether by autoclave, precured, open steam curing, hot water curing, or self-curing methods. For immersion testing or for testing the bond

strength of the lining, counter samples are to be lined as representative samples and cured along with the rubber-lined vessel. Although the inherent chemical resistance of the rubber chosen is quite suitable for the given duty conditions, often the bond or adhesion failure is the cause of lining failure. Therefore much care is taken while applying the lining especially at joints, seams, corners, and flanges.