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	Original Value	Comments

Density	1.16 g/cc	DIN 53479

Mechanical Properties	Original Value	Comments
Hardness, Shore A	70	curing Agent C1; DIN 53505
	71 @Treatment Temp. 250 °C, Time 605000 sec	Hot air aged
	77 @Treatment Temp. 250 °C, Time 3.46e+6 sec	Hot air aged
	80 @Treatment Temp. 300 °C, Time 605000 sec	Hot air aged
Tensile Strength at Break	9.00 MPa	curing Agent C1; DIN 53504 S1
	5.20 MPa @Treatment Temp. 300 °C, Time 605000 sec	Hot air aged
	5.60 MPa @Treatment Temp. 250 °C, Time 3.46e+6 sec	Hot air aged
	6.50 MPa @Treatment Temp. 250 °C, Time 605000 sec	Hot air aged
Elongation at Break	380 %	curing Agent C1; DIN 53504 S1
	140 % @Treatment Temp. 300 °C, Time 605000 sec	Hot air aged
	190 % @Treatment Temp. 250 °C, Time 3.46e+6 sec	Hot air aged
	280 % @Treatment Temp. 250 °C, Time 605000 sec	Hot air aged
Rebound	56 %	DIN 53512
Tear Strength	22.0 kN/m	ASTM D624 B
Compression Set	17 % @Temperature 175 °C, Time 79200 sec	DIN ISO 815-B

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

Processing Properties	Original Value	Comments
Cure Time	15.0 min @Treatment Temp. 165 °C	post cured 4h/200°C

Descriptive Properties
Appearance	transparent

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PWACK9238 / 204767

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