SHD Composites

Epoxy prepreg

MTC521FR

Medium temp cure, Cosmetic fire retardant

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Key Features & Benefits

Key Feature High visual clarity with flame retardant performance

Application High visual quality flame retardant system

Initial Cure Temp 175°F- 250°F

Initial Cure Time 16 Hours- 1 Hours

Post Cure Option no

Outlife 21 days at 70°F

TG Onset* 273°F -DMA

TG Peak* 318°F -DMA

Toughened Yes

Cure Autoclave

Availability All sites

MTC521FR is a clear, flame‑retardant epoxy prepreg system designed for high‑quality cosmetic carbon fibre components. This system is supplied on a wide range of woven fabrics and unidirectional reinforcements, providing excellent visual fibre definition and consistent laminate quality. Formulated for a cure temperature of 120°C (250°F), MTC521FR combines outstanding cosmetic clarity with robust fire‑performance characteristics, achieving UL94 V1 and passing CS/FAR 25.853 12‑second and 60‑second vertical burn tests.

Why choose this material

If you need a high clarity fire retardant part, MTC521FR is the ideal choice. Available from all SHD sites in the UK, US and Europe

Supplied with SHD's renowned service, including:

Short two-week lead times and low MOQs
Exceptional product quality
First class technical support
Excellent customer service
The same manufacturing equipment and processes across all sites

Advanced composite solution for Motorsport

Advanced composite solutions for aerospace (passenger plane seating)

SHD support a number of markets, including Marine, Sport and Leisure, Defence, Industrial and Rail.

Motorsport Automotive Aerospace Defense Tooling Sustainability Other Sectors

Motorsport

SHD Composites is the advanced prepreg partner behind winning race teams

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Automotive

World-class performance with unmatched premium aesthetics for prestigious supercar and hypercar brands

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Aerospace

Advanced composites specified across major commercial aircraft today

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Defense

SHD Composites is actively working on many defense programs with customers around the world

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Tooling

A tool for every geometry, a material for every tool

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Sustainability

Our enhanced sustainability product range has applications in all our key sectors including Aerospace, Automotive, Motorsport, Marine and Sport & Leisure.

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Other Sectors

Our products can be applied to a variety of markets, and this range of applications will always remain important for SHD.

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Technical Guidance Information

This material should be kept frozen at -18°C (0°F). It must be kept sealed in a polythene bag which must not be opened until fully thawed to room temperature. If the material is not fully used, then the material must be resealed in the polythene bag to prevent moisture absorption.

This material contains epoxy resin which can cause allergic reactions with skin contact and must avoid repeated and prolonged skin contact.

Please refer to the product Safety Data Sheet before using this material. The following precautions must be taken when using epoxy resin prepregs:

Overalls must be worn
Impervious gloves must be worn
Curing schedule is meant to be as a guide only and is subject to local conditions
To avoid exotherm, particular care must be taken with thick laminates
Ramp rates must not exceed 3.0°C (5.4°F)/min during cure