Vari Preg Curing Time


Author
Message
scottracing
scottracing
Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)
Group: Forum Members
Posts: 460, Visits: 5.2K
Hi there

Im looking at making some automotive and bicycle parts and I would like to use the vari-preg system as I have a laboratory oven im converting to cure composites.
In the video you say that curing time for the prepreg is 8 hours at 80°c, for me thats a bit too long as I dont want to leave parts curing overnight, especially if i get a bag burst. 
Ive looked on the site but may be not hard enough, can the cure cycle time be reduced if the temperature is increased? and do you have to have a special ramp and dwell period during the cure if so?

Many thanks
Garry
Replies
scottracing
scottracing
Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)Supreme Being (3.9K reputation)
Group: Forum Members
Posts: 460, Visits: 5.2K
Thanks for the tips guys, morepower can you tell me what prepreg you are using? I need to fins a suitable supplier here in germany as the low temp cure prepreg isnt that suitable for delivery outside of the uk Sad

The oven that I'm using can be programmed for ramp rate and a dwell period so a bit of experimenting isn't too much of a problem, im not sure if i will be using epoxy block or ali for tooling or possibly the easy composites mould material. It will mainly be down to price and size on that aspect but of course i will have to account for heat soak during the cure. 
Quality of the parts is of course paramount, but Im going to be making the parts outside of work at a friends unit and I don't want to wait till the next day to wait for the cure to be finished. 
Matt (Staff)
Matt (Staff)
Composites Expert (Staff) (8.4K reputation)Composites Expert (Staff) (8.4K reputation)Composites Expert (Staff) (8.4K reputation)Composites Expert (Staff) (8.4K reputation)Composites Expert (Staff) (8.4K reputation)Composites Expert (Staff) (8.4K reputation)Composites Expert (Staff) (8.4K reputation)Composites Expert (Staff) (8.4K reputation)Composites Expert (Staff) (8.4K reputation)
Group: Forum Members
Posts: 680, Visits: 1.9K
Hi Garry,

Our Easy-Preg and Vari-Preg systems are not low temperature cure prepregs (I would say a low temp cure prepreg is widely considered to be around 60'C); really they're reasonably typical of a medium cure temperature prepreg and are specifically designed to have long out-lives. We send the prepregs all around the world and Germany, being a near neighbour, is certainly very realistic and cost-effective for us to dispatch to. I don't know of any suppliers or manufacturers of OOA prepregs with a similar performance in Germany.

For a quicker cure cycle that will certainly yeild perfect results using our Easy-Preg Prepreg OOA Surface Layer I would suggest the following:

1hr @ 50'C
1hr @ 60'C
1hr @ 70'C
1hr @ 120'C -- > Cool to ambient.

This is a 4hr cure cycle which will give you flawless, pin-hole free results and achieve a cured laminate Tg of 120'C too. You will of course need tools that can take (and have been prepared for) 120'C.

I hope this helps, all the best,

Matt

Matt Statham
Easy Composites / Carbon Mods - Technical Sales
Edited 11 Years Ago by Matt (Staff)
GO

Merge Selected

Merge into selected topic...



Merge into merge target...



Merge into a specific topic ID...





Similar Topics

Reading This Topic

Explore
Messages
Mentions
Search