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SE 70 - Low Temperature Cure High Toughness Epoxy Prepreg System (v6)

SE 70 - Low Temperature Cure High Toughness Epoxy Prepreg System (v6)
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SE 70 - Low Temperature Cure High Toughness Epoxy Prepreg System (v6) - 1

SE 70 Low Temperature Cure High Toughness Epoxy Prepreg System n Low temperature 70°C curing n Faster cycle times at elevated temperature n Excellent balance of mechanical properties and toughness n Long outlife - up to 4 weeks @ 18-22°C n Range of compatible adhesive films and ancillary products n Excellent surface finish n Good Tg n Suitable for vacuum bag, press or autoclave consolidation Introduction SE70 is part of the range of SPRINT® products. This unique product range provides technically and commercially competitive engineering materials, ideal for use either solely, or in conjunction with other products from within the product range along with other Gurit products. SE70 is a hot melt, Diuron free epoxy SPRINT® ideally suited to the manufacture of thick sections. It can be cured at temperatures as low as 70°C, but can also be used for the rapid manufacture of components through its 25-minute cure at 120°C. All of this can be achieved together with an out-life of 21 days at 21°C. SE70 is designed for vacuum bag processing and offers excellent mechanical performance on glass fibre reinforcements. Currently SE70 is manufactured into a SPRINT® structure with E-glass and Carbon fibres, which are manufactured into biax or woven materials. This data sheet is concerned with carbon reinforcements. PDS-SE 70-6-0313 1

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SE 70 - Low Temperature Cure High Toughness Epoxy Prepreg System (v6) - 2

Processing Notes - General When preparing the lay up the prepreg should be removed from the freezer and allowed to thaw in a sealed bag. This may take 6 to 24 hours depending on roll size. This prevents atmospheric moisture from condensing on the prepreg which may cause voiding on cure. The mould surface should be release coated and must have been tested for vacuum integrity prior to lay-up. The following procedure is recommended for preparing vacuum cured laminates. 1. The moulding surface must first be treated with a suitable release agent. A separate prepreg nylon peel ply is available...

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SE 70 - Low Temperature Cure High Toughness Epoxy Prepreg System (v6) - 3

When curing at 70°C it is important to ensure the temperature is monitored off the trailing thermocouple as 70°C should be treated as the minimum cure temperature for SE 70. At temperatures below 70°C, extremely long cure times are required to generate adequate performance. Curing at Higher Temperatures SE 70 may be cured at higher temperatures for a shorter time At a cure temperature of 100°C (212°F) cure can be achieved in 100 minutes, or at 120°C (250°F) cure can be achieved in 25 It is not recommended to cure SE 70 under vacuum pressures of less than -0.85 bar. If a ramp rate of less...

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SE 70 - Low Temperature Cure High Toughness Epoxy Prepreg System (v6) - 4

Properties (cont'd) Rheological Profile for SE 70 - Oscillatory Mode Minimum Viscosity = 60 poises

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SE 70 - Low Temperature Cure High Toughness Epoxy Prepreg System (v6) - 5

Although SE 70 prepregs have greatly improved health and safety characteristics when compared to wet lay-up epoxy systems, the following points must still be considered:- 1. Avoid skin contact - wear disposable rubber gloves and use skin barrier creams 2. Avoid eye contact. If this occurs, flush with water for 15 minutes and seek medical advice. 3. Ensure good ventilation of vacuum pump exhaust during laminate cure 4. Avoid inhalation and eye contact with sanding dust. After any sanding operation of reasonable size a shower or bath should be taken and should include hair washing 5. Wear...

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SE 70 - Low Temperature Cure High Toughness Epoxy Prepreg System (v6) - 6

Transport & Storage When not in use SE 70 products should be maintained at -18°C. Shelf life for SE 70 is two years at -18°C and 4 weeks at 18-22°C. To avoid condensation on their surfaces, allow rolls to reach room temperature before unwrapping. Notice All advice, instruction or recommendation is given in good faith but Gurit AG (the company) only warrants that advice in writing is given with reasonable skill and care. No further duty or responsibility is accepted by the Company. All advice is given subject to the terms and conditions of sale (the Conditions) which are available on request...

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