SHD Prepreg composite material
Cyanate Ester prepreg

CEM101

Cyanate Ester, Enhanced Dielectric Performance
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Key Features & Benefits

Key Feature Enhanced dielectric performance
Application Enhanced service temperature and dielectric performance aerospace, space, defence and motorsport applications
Initial Cure Temp 135°C- 140°C
Initial Cure Time 3 Hours- 2 Hours
Post Cure Option yes
Outlife 30 days at 20°C
TG Onset* 400°C -DMA
TG Peak* 420°C -DMA
Toughened No
Cure Autoclave
Availability All sites

CEM101 is a cyanate ester prepreg designed to cure at medium temperatures. It is closely related to CEM100 used for high temperature motorsport applications, however CEM101 is more focused on dielectric properties for applications requiring minimal dielectric constant and loss tangent.

In such applications, materials are needed with combined characteristics of good dielectric properties coupled with structural strength. It can be supplied on a variety of fabrics to meet your cost and manufacturing requirements, however typical reinforcements include E-glass Style 7781, S2-glass Style 6781 and Quartz Style 4581.

Why choose this material

CEM101 offers enhanced dielectric performance alongside a higher temperature solution for semi-structural applications. 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 solutions for a car Advanced composite solutions for aerospace (passenger plane seating) Jet plane

Recommended markets

Automotive Aerospace Defence

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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Defence

SHD Composites is actively working on many defence programs with customers around the world
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Technical Guidance Information

01

Storage and Out Life

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.

Important Note

If bags are opened before fully cured, condensation may form on the material. Cyanate ester prepregs may react with moisture, which can affect the curing reaction and cause voidage. Great care must be taken to avoid contact with water. Thoroughly dry all tooling and fixtures before commencing lay-up.

02

Health and Safety

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 1.0°C (2.0°F)/min during initial cure and 0.3°C (0.5°F)/min during post cure

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Frequently Asked Questions

01

Is this a suitable prepreg for radomes and RF-transparent parts?

CEM101 is designed for parts that need strong radio-frequency performance alongside high heat resistance. Its low dielectric constant and low signal loss make it well suited to radomes, aerospace structures and other RF-sensitive components. 

02

What is low-loss prepreg used for?

Low-loss prepregs are used where radio or microwave signals need to pass through a composite part with minimal interference. CEM101 is developed for aerospace, space, defence and motorsport applications where both signal performance and strength matter. 

03

Can CEM101 be used for high-temperature aerospace parts?

Yes. CEM101 is designed for demanding applications and can provide a service temperature of up to 320°C after post-curing. 

04

Why use cyanate ester prepregs for radomes?

Cyanate ester prepreg systems are well suited to radomes because they can combine good heat resistance with strong dielectric performance. CEM101 is specifically designed to reduce signal loss while still providing structural strength. 

05

Is CEM101 flame resistant?

CEM101 uses an inherently flame-retardant resin system, while also offering high temperature resistance and strong dielectric performance. This makes it suitable for demanding aerospace, space and defence applications. 

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