Prepreg fiberglass composite layup

Secondary mould layup using structural adhesive on lower aileron mould

Category:

Science & Technology

Tags:

• composite
• aviation
• space
• prepreg
• fiberglass
• mould

[DGAlgie]

No it is not controlled for export. (whatever that means....)

[crosslandio]

should use a glue film with pre-preg if glueing to core or cured laminate. pre-preg needs to be thawed to manipulate it and won't cure properly until cooked to it's designed temp. It can sit in an air con room for weeks without curing.

[DGAlgie]

That's what I'm doing there, adding a structural adhesive to the cured prepreg already there, to promote the bond. Using a structural adhesive is 20% of the cost of film adhesive. Prepreg comes in all different types, this one here is a high temp, which will sit out of the freezer for days without curing. Many, however, are medium temp and will cure out of the freezer in hours.

[DGAlgie]

You have to add a structural adhesive to the prepreg for a secondary bond, or to bond to honeycomb. Never try to bond to cured laminates with just laminating resin, it is too hard and has no peel strength.

[xzacedawg03]

isn't this export controlled?

[crosslandio]

are you using an adhesive with the same cook cycle as the pre-preg? your glue will cure before your laminate and reduce bond strength. glue films are more expensive but if you go pre-preg might as well use it all thru.

[YoungJim409]

This video is a demo of part of how to assemble a composite aircraft part. The tape-looking stuff was either carbon fibre or kevlar. It can come as either dry cloth to which you add adhesive, or pre-impregnated with it (pre-preg). Pre-preg can save time but i must be kept frozen to keep the adhesive from curing early. If you've ever made papier mache, its the same process, woven strands of something surrounded by adhesive. I hope this helps.

[bazza168]

why still put resin if they already prepreg!?

[jjludemann]

I can't even understand what we're looking at here. Needs more explanation.