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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 PropertiesOriginal ValueComments
Density 1.08 g/ccTPE-0105 (ASTM D792)
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 705 Second; TPE-0169 (ASTM D 2240)
Tensile Strength, Ultimate 6.70 MPaTPE-0153 (ASTM D 412)
Elongation at Break 460 %TPE-0153 (ASTM D 412)
100% Modulus 0.00380 GPa
@Strain 100 %
TPE-0153 (ASTM D 412)
Graves Tear Strength 25.0 kN/mTPE-0056 (ASTM D 624)
Compression Set 37 %
@Temperature 100 °C
168 hrs.; TPE-0016 (ASTM D 412)
Tensile Set 11.5 %TPE-0053 (ASTM D 412)
 
Thermal PropertiesOriginal ValueComments
Brittleness Temperature <= -57.0 °CTPE-0089 (ASTM D 746)
 
Processing PropertiesOriginal ValueComments
Processing Temperature 177 - 232 °C
Drying Temperature 82.0 °CDesiccant drying for 3 hours recommended
Dry Time 3 hour

**
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