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Advanced Elastomer Systems Santoprene® 253-50 Thermoplastic Rubber

Subcategory: Elastomer, TPE; Polymer; Thermoplastic

Material Notes:
A colorable thermoplastic flame retardant elastomer with good fluid resistance, formulated to replace thermoset elastomers such as EPDM, polychloroprene, and chlorosulfonated polyethylene. It can be processed using injection molding, extrusion, blow molding or other melt processing techniques.

Key Features: Dielectric constant 2.42, dielectric strength at 3.17 mm (125 mil), 19.6 kV/mm (500 v/mil); UL Yellow Card listed, UL 94 HB flame rating; Continuous temperature rating 1000 hrs. @ 135°C (275°F); Limiting oxygen index, 23%; Excellent flex fatigue resistance; Excellent ozone resistance

Additional processing comments: This thermoplastic rubber is a shear-dependent material that can be processed on conventional thermoplastic equipment for injection molding, extrusion, or blow molding. For extrusion, a general purpose screw with a compression ratio of 2.5 to 3.0 is recommended. Material can be recycled. SANTOPRENE rubber is incompatible with acetal and PVC.

Values below are for injection molded plaques, side gated, 82.6 mm x 117.5 mm x 3.0 mm. Tensile properties measured across flow. Data provided by Advanced Elastomer Systems.

Physical Properties Metric English Comments

Density 1.1 g/cc 0.0397 lb/in³ TPE-0105 (ASTM D792)

Mechanical Properties

Hardness, Shore D 50 50 5 Second; TPE-0169 (ASTM D 2240)

Tensile Strength, Yield 10 MPa 1450 psi TPE-0153 (ASTM D 412)

Elongation at Yield 50 % 50 % TPE-0153 (ASTM D 412)

Tear Strength 78.6 kN/m 448 pli 78.6 kN/m at 23°C. Value at 100°C is 50.6 kN/m. TPE-0056 (ASTM D 624)

Compression Set 47 % 47 % 23°C, 168 hrs.; TPE-0016 (ASTM D 412)

Compression Set, Elevated Temperature 73 % 73 % 100°C, 168 hrs.; TPE-0016 (ASTM D 412)

Tensile Set 41 % 41 % 23°C, 168 hrs.; TPE-0053 (ASTM D 412)

Electrical Properties

Dielectric Constant 2.42 2.42 Frequency not specified

Dielectric Strength 19.6 kV/mm 498 kV/in at 3.17 mm (0.125 in)

Thermal Properties

Maximum Service Temperature, Air 135 °C 275 °F Continuous temperature Rating, 1000 hours

Brittleness Temperature Max -45 °C Max -49 °F TPE-0089 (ASTM D 746)

Flammability, UL94 HB HB

Processing Properties

Processing Temperature 177 - 232 °C 351 - 450 °F

Drying Temperature 82 °C 180 °F Desiccant drying for 3 hours recommended

Dry Time 3 hour 3 hour

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