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On February 1, 2022, Hexion Holdings Corporation announced that it has completed the sale of its Coatings and Composite businesses, which includes the epoxy specialty resins and base epoxy resins and intermediates product lines, to Westlake Chemical Corporation. For epoxy coatings and composite product inquiries, please contact customer service at or




Germanischer Lloyd (pending)


Rotor blades for wind turbines, boat and ship building, sports and recreation equipment, tooling and moulding. Infusion and RTM processes. Automation.


Room Temperature


Available as spray.


Fixing Glass, Carbon and other Fabric on (vertical) surfaces as seen with moulds and tools.


Shelf life of 24 months in originally sealed containers



PR685 is a process resin. It is designed to support the process of manufacturing fibre reinforced plastics, no matter whether it will use a hand laminating, a resin infusion or a RTM process or their derivatives. With PR685, any fabric material can be placed on any surface, be it vertical, horizontal or a surface with a strong three dimensional extent.


Because PR685 consists of a very high viscous Resin component only, it will dissolve in Hexion’s Infusion or RTM matrix materials. In opposition to other binder products, it will therefore not represent voids or foreign matter in a fibre reinforced plastic material but rather dissolve in Hexion’s resins and hardeners. This will allow the usage of PR685 in structurally highly loaded FRPs. A comparison between various binders including this material showed that the impact of PR685 on mechanical properties such as ILSS or bending failure is not detectable, when used according to this data sheet.


PR685 will not influence the mixing ratio of Hexion’s Infusion or RTM materials when used according to this data sheet. It is developed as a very high viscous resin which does not require a hardening component. Therefore, it will not cure when used. Instead, it will dissipate into the fabric over a timeframe of approximately two weeks (norm climate) by the capillary mechanism. Hence, when using PR685, make sure the fabric lay-up is completed including vacuum bagging/closing of the moulds within your usual process duration.


PR685 is available as spray. This solution can be applied for automation purposes. For usage additional hardware will be required. For contact details of such hardware manufacturers, please contact Hexion Stuttgart GmbH in Esslingen, Germany.


  • Solvent/carrier free epoxy resin
  • Provides excellent tack
  • Bonds to different type of substrates like metal, glass, carbon, other synthetic lamination materials, GFRP/CFRP tools or mould surfaces
  • Allows removal of top layer for repositioning
  • Soluble in the Epoxy matrix
  • Participates in the final curing/cross linking
  • Does not represent voids/foreign matter in the composite
  • Does not weaken the composite structure

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