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Advanced Elastomer Systems Santoprene® 221-55 Thermoplastic Rubber
Subcategory: Elastomer, TPE; Polymer; Thermoplastic
Material Notes:
A colorable thermoplastic UV grade 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 2.3, dielectric strength at 3.17 mm (125 mil), 19.6 kV/mm (500 v/mil); Continuous temperature rating 1000 hrs. @ 135°C (275°F); Excellent flex fatigue resistance; Excellent ozone resistance; Excellent mechanical properties retention after UV exposure
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 | |
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| Density | 0.97 g/cc | 0.035 lb/in³ | TPE-0105 (ASTM D792) | |
Mechanical Properties | ||||
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| Hardness, Shore A | 55 | 55 | 5 Second; TPE-0169 (ASTM D 2240) | |
| Tensile Strength, Ultimate | 5.2 MPa | 754 psi | TPE-0153 (ASTM D 412) | |
| Elongation at Break | 400 % | 400 % | TPE-0153 (ASTM D 412) | |
| 100% Modulus | 0.002 GPa | 0.29 ksi | TPE-0153 (ASTM D 412) | |
| Compression Set | 23 % | 23 % | 23°C, 168 hrs.; TPE-0016 (ASTM D 412) | |
Electrical Properties | ||||
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| 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 | ||||
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| 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) | |
Processing Properties | ||||
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| 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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