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	Original Value	Comments

Density	1.10 g/cc	DIN 53479

Mechanical Properties	Original Value	Comments
Hardness, Shore A	40	curing Agent C1; DIN 53505
	37 @Treatment Temp. 250 °C, Time 605000 sec	Hot air aged
	47 @Treatment Temp. 250 °C, Time 3.629e+6 sec	Hot air aged
	59 @Treatment Temp. 300 °C, Time 605000 sec	Hot air aged
Tensile Strength at Break	8.00 MPa	curing Agent C1; DIN 53504 S1
	4.50 MPa @Treatment Temp. 300 °C, Time 605000 sec	Hot air aged
	5.00 MPa @Treatment Temp. 250 °C, Time 605000 sec	Hot air aged
	5.00 MPa @Treatment Temp. 250 °C, Time 3.629e+6 sec	Hot air aged
Elongation at Break	570 %	curing Agent C1; DIN 53504 S1
	230 % @Treatment Temp. 300 °C, Time 605000 sec	Hot air aged
	340 % @Treatment Temp. 250 °C, Time 3.629e+6 sec	Hot air aged
	440 % @Treatment Temp. 250 °C, Time 605000 sec	Hot air aged
Rebound	57 %	DIN 53512
Tear Strength	20.0 kN/m	ASTM D624 B
Compression Set	12 %	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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PWACK9235 / 204764

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