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GMS Composites EP – 250

Producer:  GMS Composites
GMS Composites EP-250 is a formulated epoxy resin matrix prepreg, designed for high temperature resistant composite tooling applications. The product can be cured at temperatures, down to 55°C. This enables the tool to gel and be demoulded from a low temperature plug or model, before continuing to cure the free standing tool up to 200°C. The EP-250 has excellent mechanical properties after low temperature cure. The EP-250 prepreg has good tack and flow. EP-250 is available in a range of substrates such as carbon, glass or aramid.
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Identification & Functionality

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Features & Benefits

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Materials Features
Product Highlights
  • Low temperature initial cure from 55°C
  • Free standing post cure
  • Good surface finish
  • Suitable for a range of tools
  • Excellent shelf life
  • Wide range of fibre substrates available
  • Made in Australia

Applications & Uses

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Applications

EP-250 can be used to produce high temperature resistant composite tools with carbon, glass or aramid fibres. The versatility of EP-250, means large complex tools as well as small basic components can be produced. The EP-250 prepreg can be used to take splashes from existing parts, that have been properly prepared, for repair or reverse engineering  Applications

Properties

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Cured Properties
ValueUnitsTest Method / Conditions
Flexural Strength (at 23°C)60 - 70MPaCured neat Formulation Cycle for 24hrs at 65°C + 2hrs at 120°C + 2hrs at160°C + 2hrs at 200°C
Ultimate Elongation (at 23°C)1.5 – 2.0%Cured neat Formulation Cycle for 24hrs at 65°C + 2hrs at 120°C + 2hrs at160°C + 2hrs at 200°C
Flexural Modulus (at 23°C)3300 - 3400MPaCured neat Formulation Cycle for 24hrs at 65°C + 2hrs at 120°C + 2hrs at160°C + 2hrs at 200°C
Tensile Strength (at 23°C)28 - 30MPaCured neat Formulation Cycle for 24hrs at 65°C + 2hrs at 120°C + 2hrs at160°C + 2hrs at 200°C
Ultimate Elongation (at 23°C)0.8 – 1.0%Cured neat Formulation Cycle for 24hrs at 65°C + 2hrs at 120°C + 2hrs at160°C + 2hrs at 200°C
Tensile Modulus (at 23°C)3200 - 3300MPaCured neat Formulation Cycle for 24hrs at 65°C + 2hrs at 120°C + 2hrs at160°C + 2hrs at 200°C
Tg (DMA, RT - 300°C, 2°C /min)180 - 200°CCured neat Formulation Cycle for 24hrs at 65°C + 2hrs at 120°C + 2hrs at160°C + 2hrs at 200°C

Technical Details & Test Data

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Curing

The cure cycle for EP-250, listed below, is a guide only. It is recommended the customer trials their own cure cycle depending on the size and complexity of the tool.

Initial Cure

  • Apply a minimum of 26 inches of Hg vacuum
  • Apply 6 bar of autoclave pressure. Vacuum may be vented at 1 bar if desired.
  • Heat laminate at a rate of 0.5 -1.0°C / min. until a cure temperature of 65 – 70°C
  • Hold the laminate at 65-70°C for a dwell time of 24 hours
  • ​​​​​​​Cool the laminate under pressure to 30°C at 3°C



Post Cure

  • Heat at 1-2°C / min to 60°C and hold for 2hrs
  • Heat at 1-2°C / min to 100°C and hold for 2hrs
  • Heat at 1-2°C / min to 140°C and hold for 2hrs
  • Heat at 1-2°C / min to 180°C and hold for 2hrs
  • Heat at 1-2°C / min to 200°C and hold for 5hrs
  • ​​​​​​​Cool to room temperature at a rate of 3°C / min


or

  • ​​​​​​​Heat at 1-2°C / min to 60°C
  • Heat at 10°C hour to 200°C and hold for 5 hours
  • Cool to room temperature at a rate of 3°C / min
Gel Time

Hot plate

Temperature (°C) Time
50 1000
60 560-580
90 75-80
100 40-45
120 10-15

Values are indicative of small samples of neat resin formulation. Gel times may vary significantly in composites depending on fibre content and laminate thickness.

Storage & Handling

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Handling

Customers should ensure appropriate workplace OH&S guidelines are followed when working with this product. Appropriate measures should be taken to avoid contact with skin and eyes. Avoid inhalation of dust or fumes that may be released or created when machining, cutting or curing.

Shelf Life
  • Room temperature (23°C) > 3 weeks
  • Refrigerated (-18°C) 12 months

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Technical Data Sheet
GMS Composites EP – 250
EP – 250 Technical Data Sheet
Technical Data Sheet
Products: GMS Composites EP – 250
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