DuPont Mobility and Materials VTR 8655 (GBL-S) Peroxide Cured Fluoroelastomer (FKM)

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DuPont Mobility and Materials VTR 8655 (GBL-S) Peroxide Cured Fluoroelastomer (FKM) (discontinued **)
Categories:	Polymer; Thermoset; Fluoropolymer, TS; Thermoset Fluoroelastomer; Rubber or Thermoset Elastomer (TSE)
Material Notes:	VTR-8655 is a 68% fluorine, peroxide-cured, Viton® polymer similar to VTR-8650 but with a significantly lower gum polymer viscosity of ~25 (ML at 121°C). VTR-8655 utilizes Advanced Polymer Architecture technology which includes a new peroxide cure site along with an optimized molecular weight distribution designed to deliver a polymer which: Is ideal for blending with VTR-8650 to reach intermediate viscosity ranges Cures exceptionally fast to a high state of cure Shows improved mold release/mold fouling properties compared to Viton® GBL-200 Shows improved mold flow and less shear sensitivity than 65 Mooney VTR-8650 Shows excellent physical properties with high elongation, both original and aged Shows similar heat, fluids, and low temperature resistance compared to Viton® GBL-200 Shows improved water resistance/volume swell in water compared to Viton® GBL-200 Shows excellent compression set resistance with either low or no postcure Information provided by manufacturer.
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Mechanical Properties	Metric	English	Comments

Hardness, Shore A	70	70	Cured 7 min at 177°C and Post Cured 2 hr at 232°C
Tensile Strength, Ultimate	19.6 MPa	2840 psi	Cured 7 min at 177°C and Post Cured 2 hr at 232°C
Tensile Strength, Yield	0.700 MPa	102 psi	10% Modulus, Cured 7 min at 177°C and Post Cured 2 hr at 232°C
Elongation at Break	289 %	289 %	Cured 7 min at 177°C and Post Cured 2 hr at 232°C
100% Modulus	4.20 MPa @Strain 100 %	609 psi @Strain 100 %	Cured 7 min at 177°C and Post Cured 2 hr at 232°C
Compression Set	11 % @Temperature 200 °C	11 % @Temperature 392 °F	Method B, O-rings 22 hr at 200°C (Post Cured 4 hr at 232°C)

Thermal Properties	Metric	English	Comments
Glass Transition Temp, Tg	-18.8 °C	-1.84 °F	MDSC, postcured

Component Elements Properties	Metric	English	Comments
Fluorine, F	68 %	68 %

Descriptive Properties
Formulation as Tested	100		VTR 8655
	2		Varox® DBPH-50
	3		Zinc Oxide
	3		Diak™ 7 (TAIC)
	30		N990 Carbon Black

**
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PDVDA60 / 34029

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