Hexcel has developed HexPly M77HF epoxy prepreg which could reduce cure cycles by up to 90% compared to standard epoxy prepregs. It has a three-minute cure cycle using low pressure processing techniques such as cello-wrapping, simple presses, bladder molding and vacuum-only pressure.
The typical cure cycle in a press is three minutes at 300°F (149°C) with a minimum of 85 psi (6 bar). If Autoclave curing is preferred the recommended cycle is a ramp up of 2-5°F per minute to 300°F (149°C) with a minimum 85 psi (6 bar). Depending on the tooling design and material a dwell may be required.
M77HF is suitable for processing parameters that require additional resin flow for surface quality, compaction or low voids. According to Hexcel, the prepreg has good resin transparency, provides improved surface quality (without pinholes), and can be supplied with black pigmented resin.
Typical applications include sports equipment, automotive parts and industrial components, such as prosthetics and braces.
This story is reprinted from material from Hexcel, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.
