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GMS Composites EP – 285

Producer:  GMS Composites
GMS Composites EP-285 is a toughened epoxy resin matrix prepreg with long shelf life. The product has a versatile curing cycle from as low as 80°C or as high as 150°C, thus enabling the product to be used to produce a wide range of composite items, from large structures to numerous small components. EP-285 is available in a range of substrates such as carbon, glass or aramid. This toughened system has outstanding fracture properties and resistance to microcracking. The prepreg has good flow and the tack of EP-285 can be varied.
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Identification & Functionality


Features & Benefits

Product Highlights
  • Variable cure cycle 80°C – 150°C
  • Good surface finish
  • Suitable for a range of structures and processes
  • Toughened
  • Excellent shelf life
  • Wide range of fibre substrates available
  • Made in Australia

Applications & Uses


EP-285 can be used to produce structural components with carbon, glass or aramid fibres. It can also be used in the construction of sandwich structures. The versatility of EP-285 means that large complex structures as well as small basic components can be produced. It is possible to utilise EP-285 in a number of industries and applications such as marine, sports and leisure, industrial components, automotive and wind turbine blades.


Cured Properties
ValueUnitsTest Method / Conditions
Flexural Strength135 - 143MPaCured Neat Formulations Cycle for 10hrs at 90°C
Elongation at flexural strength6.0 – 6.6%Cured Neat Formulations Cycle for 10hrs at 90°C
Ultimate Strength132 - 140MPaCured Neat Formulations Cycle for 10hrs at 90°C
Ultimate Elongation7.2 – 8.0%Cured Neat Formulations Cycle for 10hrs at 90°C
Flexural Modulus3000 - 3300MPaCured Neat Formulations Cycle for 10hrs at 90°C
Tg (DSC, 10 K/min)100 - 110°CCured Neat Formulations Cycle for 10hrs at 90°C
Fracture Toughness K1C1.25 – 1.35MPa√mCured Neat Formulations Cycle for 10hrs at 90°C
Fracture Energy G1C430 - 470J/m2Cured Neat Formulations Cycle for 10hrs at 90°C
Water Absorption (10 days H20, 23°C)0.46 – 0.52%Cured Neat Formulations Cycle for 10hrs at 90°C

Technical Details & Test Data


The versatility of GMS Composites EP-280 means a range of cure cycles, pressures and ramp up rates can be adopted all of which will depend greatly on the part being produced. Below is a guide to cure cycles.

Temperature (°C) Time
80 12 hrs
90 8 hrs
100 4 hrs
110 2 hrs 30mins
120 1 hrs
130 30 min
140 25 mins
150 20 mins
  • Heat ramp up rate – 2°C / min
  • Pressure – 1 bar
Gel Time

Hot plate

Temperature (°C) Time (min)
80 210-240
90 120-160
100 40-60
110 17-25
120 6-10
130 2-5

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


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) > 4 weeks
  • Refrigerated (-18°C) 12 months

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Technical Data Sheet
GMS Composites EP – 285
EP – 285 Technical Data Sheet
Technical Data Sheet
Products: GMS Composites EP – 285
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