DuPont Elastomers VTR 8525 (GBLT-S) Peroxide Cured Fluoroelastomer (FKM) Formulation

Subcategory: Fluoropolymer, TS; Elastomer, TS; Thermoset

Close Analogs: This former DuPont Dow Elastomers product line is now produced by DuPont Performance Elastomers.

Material Notes:

Formulation

VTR-8525	100
Zinc Oxide	3
N990 Carbon Black	30
Diak™ 7 (TAIC)	3
Luperox® 101-XL peroxide	3

Description: VTR-8525 is a new, developmental 66% fluorine peroxide cured polymer that utilizes DuPont Dow's new Advanced Polymer Architecture technology to create an unique new seal offering for fuel systems. VTR-8525, which will become Viton® GBLT-S once it is fully commercial, has the following attributes:

• VTR-8525 is a one polymer alternative to GLT and GFLT for fuel seals and fuel injector O-rings
  • Better low temperature sealing than GFLT...–40°C and below
  • Better fuel/alcohol/methanol resistance than GLT
  • Current GFLT and GLT auto specs could be combined into one specification
• VTR-8525 derives additional benefits from new Advanced Polymer Architecture technology
  • Physical modulus is low, elongation is high - parts are easier to stretch, more tear resistant in automated assembly equipment
  • Cures exceptionally fast to a high state of cure
  • Shows improved mold release/mold fouling properties compared to GLT and GFLT
  • Shows excellent compression set resistance with little (2 hr at 232°C) or no postcure

It is recommended to use at least 70% load factor in an internal mixer. The recommended process aid for VTR-8525 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.