DuPont Mobility and Materials VTR 8550 (GFLT-S) Peroxide Cured Fluoroelastomer (FKM) Formulation

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DuPont Mobility and Materials VTR 8550 (GFLT-S) Peroxide Cured Fluoroelastomer (FKM) Formulation (discontinued **)
Categories:	Polymer; Thermoset; Fluoropolymer, TS; Thermoset Fluoroelastomer; Rubber or Thermoset Elastomer (TSE)
Material Notes:	VTR-8550 is 67% fluorine peroxide cured polymer similar to Viton® GFLT with significantly improved processing and curing characteristics. VTR-8550 utilizes an Advanced Polymer Architecture technology designed to deliver a polymer which: Cures exceptionally fast to a high state of cure Shows improved mold release/mold fouling properties compared to GFLT or GFLT-300 Shows improved mold flow, less shear sensitivity, and lower extruder die swell in a ~60 Mooney FKM Shows excellent physical properties with high elongation in either the original or aging tests Shows similar to improved heat, fluids, and low temperature resistance compared to GFLT Shows excellent compression set resistance with little (2 hr at 232°C) or no postcure It is recommended to use at least a 70% load factor in an internal mixer. The recommended process aid for VTR-8550 is 0.5 phr of Armeen® 18D. A two part process aid system of Armeen® 18D with Strucktol WS 280 at 0.8 phr each is optimal if that level of process aid can be tolerated in mold shrinkage. The use of Diak™ #8 is NOT recommended as it causes poor mold release and high compression set. Information provided by manufacturer.
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Physical Properties	Metric	English	Comments

Mooney Viscosity	64 @Temperature 121 °C	64 @Temperature 250 °F	ML-10 (gum)

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	71	71	Cured 7 min at 177°C and Post Cured 2 hr at 232°C
Tensile Strength, Ultimate	18.3 MPa	2650 psi	Cured 7 min at 177°C and Post Cured 2 hr at 232°C
Tensile Strength, Yield	0.800 MPa	116 psi	10% Modulus, Cured 7 min at 177°C and Post Cured 2 hr at 232°C
Elongation at Break	207 %	207 %	Cured 7 min at 177°C and Post Cured 2 hr at 232°C
100% Modulus	6.60 MPa @Strain 100 %	957 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 2 hr at 232°C)

Thermal Properties	Metric	English	Comments
Brittleness Temperature	-23.9 °C	-11.0 °F	TR-10
Glass Transition Temp, Tg	-25.7 °C	-14.3 °F	DSC

Component Elements Properties	Metric	English	Comments
Fluorine, F	67 %	67 %

Descriptive Properties
Formulation as Tested	100		VTR-8550
	3		Zinc Oxide
	3		Diak™ 7 (TAIC)
	3		Luperox® 101-XL 45
	30		N990 Carbon Black

**
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PDVDA51 / 34020

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