SikaBiresin CR86 Resin and CH86 Hardener System

Description

SikaBiresin CR86 epoxy is a high-clarity, low-viscosity infusion system developed for composite structures, tools, and marine parts. The resin pairs with three standard CH86 hardeners that provide different working times while maintaining a fluid mixed consistency. That combination supports resin infusion, RTM, vacuum bagging, and wet-layup processes where fabric wet-out and controlled flow through the reinforcement are central to the finished laminate.

SikaBiresin CR86 Epoxy Infusion Workflows

The system’s low mixed viscosity helps resin move through reinforcement and distribution media during vacuum-assisted processing. It can also serve processes that require hand placement or closed-mold transfer. Clear to light-amber appearance makes flow and wet-out easier to observe during setup. Applications include composite tooling, marine structures, transportation parts, and industrial components. Process trials should establish flow distance, vacuum integrity, resin demand, and cure schedule before production.

SikaBiresin CR86 Epoxy Working-Time Options

CH86-2 is the fast hardener, CH86-3 is the medium option, and CH86-6 provides the longest standard working window. Published data for the fast combination lists a 100-to-27 mix ratio by weight, approximately 266 cps mixed viscosity at 25 degrees C, and a 25-to-35-minute gel time for a 150-gram mass at 77 degrees F. Sika’s broader product guide reports longer pot-life windows for the medium and slow hardeners, allowing larger or more complex infusions to be planned around the available fill time.

Key System Data

• Chemistry: two-component epoxy infusion system
• Processes: infusion, RTM, vacuum bagging, and wet layup
• Standard hardeners: CH86-2 fast, CH86-3 medium, CH86-6 slow
• Fast mix ratio by weight: 100 resin to 27 hardener
• Fast mixed viscosity: approximately 266 cps at 25 degrees C
• Appearance: clear resin with light-amber mixed appearance
• Cure options: room-temperature cure and post-cure
• Typical uses: composite tools, parts, and marine structures

Reliable infusion starts with dry reinforcement, sealed tooling, calibrated weighing, thorough mixing, and a verified vacuum test before resin enters the part. Match the hardener to expected fill time and part mass, since a cure schedule that is too fast can interrupt flow. For related options around SikaBiresin CR86 epoxy, browse Chemical Concepts epoxy products for related resin systems and shop materials. Visit Sika’s US composite materials resource for current technical documentation.

Need Help?

Need help comparing hardener speeds or planning an infusion setup? Call (800) 220-1966 or email [email protected].