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Advanced Elastomer Systems Santoprene® 171-73 Thermoplastic Rubber

Subcategory: Elastomer, TPE; Polymer; Thermoplastic

Material Notes:
A black thermoplastic specialty elastomer which complies with FDA regulations for rubber articles intended for repeated use, as well as rubber articles in contact with non-fatty, non-oily foods as closures and sealing gaskets, formulated to replace thermoset elastomers like EPDM, polychloroprene, and chlorosulfonated polyethylene. It can be processed using injection molding, extrusion, blow molding or other melt processing techniques.

Key Features: Dielectric constant 2.3, 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); Excellent flex fatigue resistance; Complies with 21 CFR 177.1210 "Closures with Sealing Gaskets for Food Containers"; Complies with 21 CFR 177.2600 "Rubber Articles Intended for Repeated Use"

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	0.98 g/cc	0.0354 lb/in³	TPE-0105 (ASTM D792)
Mechanical Properties
Hardness, Shore A	73	73	5 Second; TPE-0169 (ASTM D 2240)
Tensile Strength, Ultimate	8.5 MPa	1230 psi	TPE-0153 (ASTM D 412)
Elongation at Break	460 %	460 %	TPE-0153 (ASTM D 412)
100% Modulus	0.0036 GPa	0.522 ksi	TPE-0153 (ASTM D 412)
Tear Strength	28 kN/m	160 pli	28 kN/m at 23°C. Value at 100°C is 13 kN/m. TPE-0056 (ASTM D 624)
Compression Set	24 %	24 %	23°C, 168 hrs.; TPE-0016 (ASTM D 412)
Compression Set, Elevated Temperature	38 %	38 %	100°C, 168 hrs.; TPE-0016 (ASTM D 412)
Tensile Set	14 %	14 %	23°C, 168 hrs.; TPE-0053 (ASTM D 412)
Electrical Properties
Dielectric Constant	2.3	2.3	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 -60 °C	Max -76 °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