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Advanced Elastomer Systems Santoprene® 251-92 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 2.43, dielectric strength at 3.17 mm (125 mil), 19.6 kV/mm (500 v/mil); UL Yellow Card listed, UL 94 flame rating V-O; Limiting oxygen index, 25%; 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 | Original Value | Comments | ||
| ||||
| Density | 1.22 g/cc | TPE-0105 (ASTM D792) | ||
Mechanical Properties | ||||
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| Hardness, Shore A | 92 | 5 Second; TPE-0169 (ASTM D 2240) | ||
| Tensile Strength, Ultimate | 12.4 MPa | TPE-0153 (ASTM D 412) | ||
| Elongation at Break | 530 % | TPE-0153 (ASTM D 412) | ||
| 100% Modulus | 0.006 GPa | TPE-0153 (ASTM D 412) | ||
| Tear Strength | 44.3 kN/m | 44.3 kN/m at 23°C. Value at 100°C is 18.4 kN/m. TPE-0056 (ASTM D 624) | ||
| Compression Set | 35 % | 23°C, 168 hrs.; TPE-0016 (ASTM D 412) | ||
| Compression Set, Elevated Temperature | 62 % | 100°C, 168 hrs.; TPE-0016 (ASTM D 412) | ||
| Tensile Set | 21 % | 23°C, 168 hrs.; TPE-0053 (ASTM D 412) | ||
Electrical Properties | ||||
| ||||
| Dielectric Constant | 2.43 | Frequency not specified | ||
| Dielectric Strength | 19.6 kV/mm | at 3.17 mm (0.125 in) | ||
Thermal Properties | ||||
| ||||
| Brittleness Temperature | Max -55 °C | TPE-0089 (ASTM D 746) | ||
| Flammability, UL94 | HB | |||
| Oxygen Index | 25 % | |||
Processing Properties | ||||
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| Processing Temperature | 177 - 232 °C | |||
| Drying Temperature | 82 °C | Desiccant drying for 3 hours recommended | ||
| Dry Time | 3 hour | |||
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