Talk Composites - The Forum for Advanced Composites

Eg160 Mould - Hairline Cracks after heat cycle

http://www.talkcomposites.com/Topic40307.aspx

By bennyT - 9/21/2021 7:41:47 PM

Hey all,

I have been using EG160 tooling gel coat for my moulds backed up with carbon fibre and EL160 for items being made with ooa prepreg.

On a couple of occasions after the first attempt at making a part and after the heat cycle I have noticed hairline cracking in the gelcoat (see attached picture).

Note: I have only ever seen this after the heat cycle and releasing the part. Before the heat cycle everything is fine. 

Any ideas?
By bennyT - 9/23/2021 6:07:01 PM

 
Warren (Staff) - 9/23/2021 12:29:51 PM
Sounds like it should be plenty stiff. Perhaps too thick gel or demoulding too soon? 

Ok thanks, will give it a try 👍