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Rubber Materials Code Name Code Name of ASTM
Natural Rubber NR AA.
Polyisoprene Rubber IR AA.
Styrene Butadiene Rubber SBR AA.
Polybutadiene Rubber BR AA. BA.
Butyl Rubber IIR BA.
Ethylene Propylene Rubber EPDM AA. BA. CA. DA
Polychloroprene Rubber CR BC. BE.
Nitrile Rubber NBR BF. BG. BK. CH.
Polyurethane Rubber PU BG.
Hypalon. Polyethylene CSM CE.
Polyacrylate Rubber ACM DF. DH. EH.
Silicone Rubber SI FC. FE. GE.
Fluoro Carbon Rubber FKM HK.

temperture resistance of rubber materials

HOW TO SELECT RUBBER MATERIAL..............................
I. The service conditions to be considered include:

1. Fluid to be sealed, including any contaminants or additives.
2. Temperature range including minimum and maximum operating conditions, as
    well as thermal cycling and potential excursions.
3. Pressure range - ingluding minimum and maximum operating range with an
    error range and compression/ decompression rate if the pressure is high.
4. Vacuum application - including where the vacuum is applied and whether it is
5. Motion - either static or dynamic. If it is dynamic, describe the motion.
II. The design requirements of the particular sealing application are also critical including:

1. Component geometry/ description, like O-ring, gasket, diaphragm, etc.
2. Chemical media's affect on the seal.
3. Desired service life. If it is a replacement for a failed seal, which material was
    used before and why did it fail.
4. Assembly considerations including lubricants, installed stretch, etc.
5. Critical dimensions and tolerances, including groove dimensions and machin-
    ing tolerances.
III. It is important to consider the inspection requirements including:

1. Defining inspection criteria.
2. Determining the need for lot sampling.
3. Setting acceptable quality levels (AQLs).
4. Indicating the critical sealing surface.
IV. Material specification and traceability are also critical for proper seal selection.

1. Define material specifications by the American Society for Testing and
    Materials (ASTM). Society of Automotive Engineers (SAE), military
    specification or other recognized standards.
2. Discuss with your seal supplier the procedure for specifying and certifying
    sealing materials.
3. Ask your supplier if compound changes may without a customer's knowledge
    and how to protect yourself from it. Are hardness buttons, tensile bars or
    other test specimens required for incoming material verification.
V. Cost versus Value:

When selecting materials for your particular sealing application, the guiding principle should be "value-in-use." When evaluating seal performance, seal life and maintenance costs must be included. A seal made from EPDM may be appropriate for many general applications where heat and steam are encountered, but inappropriate at higher temperatures when contaminated steam are frequent maintenance are required. The relatively high price of a fluoroelastomer or perfluoroelastomer will be recouped many times over by a seal's long service life. Specifying the proper high performance seal can also prevent costly unscheduled downtime and dangerous leakage.
When selecting elastomeric seals for specific applications, there are a number of important selection criteria including the anticipated service conditions, the design and inspection requirements for the particular application and material specification and traceability.

Download the Rubber Material Properties PDF file.............................................
download rubber materials properties PDF file