Wacker Elastosil® R 420/30 Silicone Rubber

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Wacker Elastosil® R 420/30 Silicone Rubber
Categories:	Polymer; Thermoset; Silicone; Silicone Rubber
Material Notes:	ELASTOSIL® R 420 silicone rubbers feature outstanding tear resistance and high transparency. Application: In principle ELASTOSIL® R 420/30 is designed for compression, transfer and injection molding. Postcured parts can be used for food contact applications and are suitable for use under the Recommendation "XV. Silicones" of the BfR and FDA § 177.2600 under observance of any given limitations on extractable and volatile substances. Information provided by Wacker Chemie AG.
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Physical Properties	Metric	English	Comments

Density	1.10 g/cc	0.0397 lb/in³	ISO 1183-1 A

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	29	29	curing agent C1; DIN 53505
	31	31	curing agent E; DIN 53505
Tensile Strength at Break	8.00 MPa	1160 psi	curing agent E; DIN 53504 S1
	10.0 MPa	1450 psi	curing agent C1; DIN 53504 S1
Elongation at Break	670 %	670 %	curing agent E; DIN 53504 S1
	930 %	930 %	curing agent C1; DIN 53504 S1
Rebound	47 %	47 %	curing agent C1; DIN 53512
	53 %	53 %	curing agent E; DIN 53512
Tear Strength	26.0 kN/m	148 pli	curing agent E; ASTM D624 B
	33.0 kN/m	188 pli	curing agent C1; ASTM D624 B
Compression Set	18 % @Temperature 175 °C, Time 79200 sec	18 % @Temperature 347 °F, Time 22.0 hour	curing agent C1; DIN ISO 815-B
	28 % @Temperature 175 °C, Time 79200 sec	28 % @Temperature 347 °F, Time 22.0 hour	curing agent E; DIN ISO 815-B

Optical Properties	Metric	English	Comments
Transmission, Visible	90 %	90 %	"Transparent" but manufacturer does not quantify.

Processing Properties	Metric	English	Comments
Cure Time	10.0 min @Treatment Temp. 135 °C	0.167 hour @Treatment Temp. 275 °F	curing agent E, press cured, 4hr/200°C
	15.0 min @Treatment Temp. 165 °C	0.250 hour @Treatment Temp. 329 °F	curing agent C1, press cured, 4hr/200°C
	15.0 min @Treatment Temp. 165 °C	0.250 hour @Treatment Temp. 329 °F	curing agent C6, press cured, 4hr/200°C

Descriptive Properties
Appearance	transparent

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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