SikaBiresin® L323 -Lightweight Composite Tooling Compound/Tooling Dough Part A-21#-Part B-19.5#

SikaBiresin® L323 – Epoxy Composite Tooling Dough

SikaBiresin® L323 is a high-performance, epoxy-based composite tooling compound designed for building tools, plugs, jigs, fixtures, and models used in composite manufacturing. Its dough-like consistency makes it easy to form and apply, while delivering strong dimensional stability for precision tooling applications.

Once mixed, L323 creates a pliable, formable compound that can be built up in thickness and then machined, drilled, and tapped after cure—making it a practical alternative to conventional laminate build methods for many tooling and model-making jobs.

Key Benefits

• Easy mix verification with colored resin and hardener for clearer mixing indication
• Pliable and formable consistency that holds shape during application
• Machinable after cure (can be cut, drilled, tapped, and finished)
• Lightweight, low-density compound for tooling and model builds
• Dimensional stability with low thermal expansion for accurate tooling
• Controlled heat build to support thicker applications without excessive exotherm

Common Applications

• Tooling cores, plugs, and patterns
• Composite jigs, fixtures, and shop aids
• Prototype models and formable structures
• Lightweight tooling and sandwich-style builds

Notes

Always follow the manufacturer’s mixing, application, and cure recommendations for best results. If you need help selecting a compatible surface coat, tooling resin, or post-cure schedule for your application, contact our team.

Need a quote or lead time? Reach out and we’ll help you spec the right tooling system for your project.