Wacker Elastosil® R 756/70 Silicone Rubber

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Wacker Elastosil® R 756/70 Silicone Rubber
Categories:	Polymer; Thermoset; Silicone; Silicone Rubber
Material Notes:	ELASTOSIL® R 756/70 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 good tear resistance, low compression set and are highly elastic. Application: ELASTOSIL® R 756/70 is optimized for applications at high temperatures and can be used for molding and extrusion applications. Vulcanizates of ELASTOSIL® R 756/70 in combination with ELASTOSIL®AUX Stabilizer, can withstand temperatures of 250°C over a period of at least six weeks. Information provided by Wacker Chemie AG.
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Physical Properties	Metric	English	Comments

Density	1.16 g/cc	0.0419 lb/in³	DIN 53479

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	70	70	curing Agent C1; DIN 53505
	71 @Treatment Temp. 250 °C, Time 605000 sec	71 @Treatment Temp. 482 °F, Time 168 hour	Hot air aged
	77 @Treatment Temp. 250 °C, Time 3.46e+6 sec	77 @Treatment Temp. 482 °F, Time 960 hour	Hot air aged
	80 @Treatment Temp. 300 °C, Time 605000 sec	80 @Treatment Temp. 572 °F, Time 168 hour	Hot air aged
Tensile Strength at Break	9.00 MPa	1310 psi	curing Agent C1; DIN 53504 S1
	5.20 MPa @Treatment Temp. 300 °C, Time 605000 sec	754 psi @Treatment Temp. 572 °F, Time 168 hour	Hot air aged
	5.60 MPa @Treatment Temp. 250 °C, Time 3.46e+6 sec	812 psi @Treatment Temp. 482 °F, Time 960 hour	Hot air aged
	6.50 MPa @Treatment Temp. 250 °C, Time 605000 sec	943 psi @Treatment Temp. 482 °F, Time 168 hour	Hot air aged
Elongation at Break	380 %	380 %	curing Agent C1; DIN 53504 S1
	140 % @Treatment Temp. 300 °C, Time 605000 sec	140 % @Treatment Temp. 572 °F, Time 168 hour	Hot air aged
	190 % @Treatment Temp. 250 °C, Time 3.46e+6 sec	190 % @Treatment Temp. 482 °F, Time 960 hour	Hot air aged
	280 % @Treatment Temp. 250 °C, Time 605000 sec	280 % @Treatment Temp. 482 °F, Time 168 hour	Hot air aged
Rebound	56 %	56 %	DIN 53512
Tear Strength	22.0 kN/m	126 pli	ASTM D624 B
Compression Set	17 % @Temperature 175 °C, Time 79200 sec	17 % @Temperature 347 °F, Time 22.0 hour	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.

PWACK9238 / 204767

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