Autoclave vacuum bag/breather (Airtech)

General Composites Discussions Composites Talk
#1

Hi guys. I need vacuum bag for 120°C and 7atm max autoclave cure. I was looking at Airtech bags but cant decide whitch one. According to selector Dahlar release bag 125 can do this task (140deg max), but no information if its suitable for autoclave pressures. Parts will be smaller one, max size 1m x 0.5m . Quite complicated shapes.

Also I cannot decide which breather/bleeder to choose. Airweave Super 10 or Ultraweave 1032? Both are suitable for autoclave.

Can anybody help? I dont want to buy full roll and not be able to use it.

Thanks a lot.

Mike

#2

We use Wrightlon 7400, and Airweave N10 and N4, both oven/RT bagging, and autoclave. We don’t use anything special for autoclave. Just make sure you do not have bridging, and it won’t matter what film you use. (well, besides the temp limit)

#3

thanks for exact help riff42 :wink:

#4

Pressures don’t matter to the release films. Just the service temperature. With low stretch films though, watch out for bridging as the bag can rupture when the autoclave pressure tries to force it down.

#5

Thanks TET, I was thinking that it matters, I found somewhere info next to one Stretchlon type (not sure whitch number) that its not suitable for autoclave. Same for one type of Securlon.

#6

I can confirm from a massive failure that Stretchlon is no good. It just melts to the part.

I just got a delivery of bag (so I can look at the part number) and can tell you we use Airtec WL7400 75micron.

Remember that not only bag can bridge, the perf can too. And if it rips the breather will stick to the laminate.

#7

Thanks guys,

I will stick to the Wrightlon 7400 and be very careful for bridging.

Thanks,

Mike

#8

from a bystander’s point that could be very funny… now if it happened to me, not very funny :smiley:

Also make sure your butyl bag tape can handle the temp.

#9

what is the temp limits of Strechlon?? I’ve wanted to get a few rolls of that, since the Wrightlon 7400 is just…well, a nylon bag. Would be nice to have something that doesn’t bridge much. And no, bagging melting BELOW rated temp is NOT fun. Apparently our hotpress has hotspots, even when it says it is 100f below max service of the bag!!!

#10

http://catalogue.airtech.lu/category.php?category_id=2&lang=EN