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Advanced Elastomer Systems Santoprene® 251-70 W232 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 does not contain polybrominated diphenylethers (PBDEs) and can be processed using injection molding, extrusion, blow molding or other melt processing techniques.

Key Features: Excellent flex fatigue resistance; Excellent ozone resistance; Limiting oxygen index, 26%

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	1.23 g/cc	0.0444 lb/in³	TPE-0105 (ASTM D792)
Mechanical Properties
Hardness, Shore A	70	70	5 Second; TPE-0169 (ASTM D 2240)
Tensile Strength, Ultimate	5.5 MPa	798 psi	TPE-0153 (ASTM D 412)
Elongation at Break	460 %	460 %	TPE-0153 (ASTM D 412)
100% Modulus	0.0026 GPa	0.377 ksi	TPE-0153 (ASTM D 412)
Thermal Properties
Brittleness Temperature	Max -57 °C	Max -70.6 °F	TPE-0089 (ASTM D 746)
Oxygen Index	26 %	26 %	TPE-0112 (ASTM D 2863)
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