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ExxonMobil Santoprene® 521-70 Thermoplastic Rubber  (discontinued **)
Categories: Polymer; Thermoplastic; Elastomer, TPE; Thermoplastic Elastomer, Melt-Processible Rubber

Material Notes: A black thermoplastic elastomer designed for glazing and sealing applications 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: Recommended for glazing and sealing applications; Good UV stability; Passes ASTM C 542 Flame Test requirement; Good low temperature flexibility

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.

Vendors: No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
 
Physical PropertiesMetricEnglishComments
Density 1.08 g/cc0.0390 lb/in³TPE-0105 (ASTM D792)
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore A 70705 Second; TPE-0169 (ASTM D 2240)
Tensile Strength, Ultimate 6.70 MPa972 psiTPE-0153 (ASTM D 412)
Elongation at Break 460 %460 %TPE-0153 (ASTM D 412)
100% Modulus 3.80 MPa
@Strain 100 %
551 psi
@Strain 100 %
TPE-0153 (ASTM D 412)
Graves Tear Strength 25.0 kN/m143 pliTPE-0056 (ASTM D 624)
Compression Set 37 %
@Temperature 100 °C
37 %
@Temperature 212 °F
168 hrs.; TPE-0016 (ASTM D 412)
Tensile Set 11.5 %11.5 %TPE-0053 (ASTM D 412)
 
Thermal PropertiesMetricEnglishComments
Brittleness Temperature <= -57.0 °C<= -70.6 °FTPE-0089 (ASTM D 746)
 
Processing PropertiesMetricEnglishComments
Processing Temperature 177 - 232 °C351 - 450 °F
Drying Temperature 82.0 °C180 °FDesiccant drying for 3 hours recommended
Dry Time 3 hour3 hour

**
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Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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