Wacker Elastosil® R 756/40 Silicone Rubber

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Wacker Elastosil® R 756/40 Silicone Rubber
Categories:	Polymer; Thermoset; Silicone; Silicone Rubber
Material Notes:	ELASTOSIL® R 756/40 is a peroxide curing high consistency silicone rubber whose vulcanizates possess excellent resistance to hot air, particularly after addition of heat stabilizer. The vulcanizates show low compression set and are highly elastic. Application: ELASTOSIL® R 756/40 is optimized for applications at high temperatures and can be used for molding applications. Vulcanizates of ELASTOSIL® R 756/40 in combination with ELASTOSIL® AUX Stabilizer, can withstand temperatures of 300 °C for at least seven days. Information provided by Wacker Chemie AG.
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Physical Properties	Metric	English	Comments

Density	1.10 g/cc	0.0397 lb/in³	DIN 53479

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	40	40	curing Agent C1; DIN 53505
	37 @Treatment Temp. 250 °C, Time 605000 sec	37 @Treatment Temp. 482 °F, Time 168 hour	Hot air aged
	47 @Treatment Temp. 250 °C, Time 3.629e+6 sec	47 @Treatment Temp. 482 °F, Time 1008 hour	Hot air aged
	59 @Treatment Temp. 300 °C, Time 605000 sec	59 @Treatment Temp. 572 °F, Time 168 hour	Hot air aged
Tensile Strength at Break	8.00 MPa	1160 psi	curing Agent C1; DIN 53504 S1
	4.50 MPa @Treatment Temp. 300 °C, Time 605000 sec	653 psi @Treatment Temp. 572 °F, Time 168 hour	Hot air aged
	5.00 MPa @Treatment Temp. 250 °C, Time 605000 sec	725 psi @Treatment Temp. 482 °F, Time 168 hour	Hot air aged
	5.00 MPa @Treatment Temp. 250 °C, Time 3.629e+6 sec	725 psi @Treatment Temp. 482 °F, Time 1008 hour	Hot air aged
Elongation at Break	570 %	570 %	curing Agent C1; DIN 53504 S1
	230 % @Treatment Temp. 300 °C, Time 605000 sec	230 % @Treatment Temp. 572 °F, Time 168 hour	Hot air aged
	340 % @Treatment Temp. 250 °C, Time 3.629e+6 sec	340 % @Treatment Temp. 482 °F, Time 1008 hour	Hot air aged
	440 % @Treatment Temp. 250 °C, Time 605000 sec	440 % @Treatment Temp. 482 °F, Time 168 hour	Hot air aged
Rebound	57 %	57 %	DIN 53512
Tear Strength	20.0 kN/m	114 pli	ASTM D624 B
Compression Set	12 %	12 %	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	15.0 min @Treatment Temp. 165 °C	0.250 hour @Treatment Temp. 329 °F	post cured 4h/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.

PWACK9235 / 204764

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