Wacker Elastosil® R 401/40 Silicone Rubber

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Wacker Elastosil® R 401/40 Silicone Rubber
Categories:	Polymer; Thermoset; Silicone; Silicone Rubber
Material Notes:	Vulcanizates made from this compound exhibit a unique combination of characteristics. They are noted for their good flexibility, high transparency, and mechanical properties. The compounds are easily pigmented with ELASTOSIL® PT Pigment Pastes and have good processing characteristics. Application: ELASTOSIL® R 401/40 has many different uses, being suitable for molded articles and extrusions such as seals, sheet, tubing and profiles. 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	1.12 g/cc	0.0405 lb/in³	ISO 1183-1 A

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	41	41	curing agent C1; DIN 53505
	42	42	curing agent E; DIN 53505
Tensile Strength at Break	10.0 MPa	1450 psi	curing agent E; DIN 53504 S1
	11.0 MPa	1600 psi	curing agent C1; DIN 53504 S1
Elongation at Break	580 %	580 %	curing agent E; DIN 53504 S1
	730 %	730 %	curing agent C1; DIN 53504 S1
Rebound	53 %	53 %	curing agent C1; DIN 53512
	56 %	56 %	curing agent E; DIN 53512
Tear Strength	23.0 kN/m	131 pli	curing agent E; ASTM D624 B
	28.0 kN/m	160 pli	curing agent C1; ASTM D624 B
Compression Set	16 % @Temperature 175 °C, Time 79200 sec	16 % @Temperature 347 °F, Time 22.0 hour	curing agent C1; DIN ISO 815-B
	36 % @Temperature 175 °C, Time 79200 sec	36 % @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

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PWACK9191 / 204720

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