What is the difference between dry lay-up and wet lay-up?
The short-term is a wet layup and consists of leaving the boiler filled with concentrated, chemically treated boiler water; preferably with a pH of 12.4 (or as close as possible). The long term is a dry layup. The boiler should first be drained of all water contents within the boiler.
What is wet lay-up process?
Wet Lay-up/Hand Lay-up Manufacturing Process for Composites. Simple, low cost, open mold fabrication process using liquid epoxy resin to position layers of laminations in a mold until desired shape/thickness is achieved. Secondary posture process will enhance/maximize composite performance capability.
How long does prepreg last?
Prepreg will remain chemically within shelf life for up to 18 months at -18 °C. When not being used prepreg should be stored at -5°C or below to maximize shelf life. In frozen storage the Prepreg should be tightly sealed in its plastic sleeve and in the original box or stillage.
What are the advantages of using prepreg instead of hand layup?
“There are several advantages to using a prepreg rather than using traditional hand layup.. Maximum strength properties. Part uniformity and repeatability. Less mess and less waste. Less curing time. Better cosmetics.
Who are the people who use pre preg laminating?
Who uses pre-pregs? Prep-preg lamination is the go-to method for many industries: Aircraft: Boeing, Airbus, etc. all use pre-pregs in both manual and automated layup. Space Stuff: Rocket fairings, tanks, spacecraft and satellite parts – almost all “space composites” are pre-preg.
What makes a prepreg ready to lay into a mold?
This resin system (typically epoxy) already includes the proper curing agent. As a result, the prepreg is ready to lay into the mold without the addition of any more resin.
What’s the best temperature to use pre preg?
Even better, there are “low temperature” pre-preg systems that can be cured at 170F / 70C to 220F / 105C . These open up the option of using wood (MDF) and epoxy or urethane tooling board products for direct molds. Low temperature pre-pregs can be processed in easy-to-make composite tooling too for production lamination.