SHD Prepreg composite material
Epoxy prepreg

SFX740-HF

A high-build composite solution engineered to further suppress fibre print-through
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Key Features & Benefits

Key Feature Fibre print-through suppression
Application Composite structures requiring high cosmetic standards for a paint finish
Initial Cure Temp 149°F- 248°F
Initial Cure Time Consult Data Sheet Hours
Post Cure Option no
Outlife 21 days at 70°F
TG Onset* 266°F -DMA
TG Peak* 284°F -DMA
Toughened No
Cure Oven
Availability Usa

SFX740-HF is a high-build solution engineered to further suppress fibre print-through. It is a final finish parasitic material for bench detailing and ultimate surface uniformity, often on challenging composite structures requiring high cosmetic standards for a paint finish.

Part of SHD's SFX740 range of epoxy surfacing films delivering outstanding low-defect surface quality straight out of the mould.

Why choose this material

If you're experiencing fibre print-through, SFX740-HF is the ideal solution. It is a simple addition to your manufacturing process that will provide further suppression of fibres for the desired surface finish.

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) Military drone Advanced composite solution for Motorsport

Recommended markets

Automotive Aerospace Defense Motorsport

Automotive

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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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Motorsport

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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.

02

Health and Safety

This material contains epoxy resin, which can cause allergic reactions with skin contact. Repeated or prolonged skin contact must be avoided. Please refer to the product Safety Data Sheet before using this material. The following precautions must be taken when using epoxy surfacing films:

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

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Frequently Asked Questions

01

How can I reduce fibre print-through on painted composite parts?

SFX740-HF is designed to reduce visible fibre print-through and create a more even surface. This helps improve the final painted finish, especially on complex composite structures where surface quality is critical. 

02

What surface film is suitable for high-quality painted composite parts?

SFX740-HF is a high-build surface film made for components that need a very smooth, consistent finish before painting. It is especially useful where the underlying fibre pattern might otherwise show through. 

03

Can surface film reduce sanding and finishing work?

Yes. The SFX740 range is designed to deliver a high-quality surface straight from the mould, which can reduce post-processing and may only require light preparation before painting. 

04

Can SFX740-HF be processed without an autoclave?

Yes. SFX740-HF is designed for out-of-autoclave processing and also offers low-temperature cure options, making it easier to use with oven-based manufacturing setups. 

05

Can SFX740-HF be used with existing SHD prepregs?

Yes. SFX740-HF is designed to work with SHD’s MTC and VTC epoxy prepreg systems, allowing it to be added as a finishing layer without changing the main laminate material. 

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