Post curing question

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Post curing question

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noble350	noble350 posted 12 Years Ago HOT Topic Details
Group: Forum Members Posts: 11, Visits: 131	Hi, I'm working on my university research. I made a prototype of carbon fiber part. It's like cf strip I made it with wet lay-up process. However I used high temp resin for two ends and EL2 resin for the rest. My question is that high temp. resin needs elevated temperature post‐cure cycle up to 160C while EL2 just to 60C, how can I post cure this? I was thinking after I post cure the whole part according to EL2 procedure, I stick only the two ends in oven and continue post curing up to 160. But I hope someone has another simpler solution Thanks Mohamed Kiari
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Matthieu Libeert	Matthieu Libeert posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 955, Visits: 3.4K	Can I ask you how you put only one end into an oven? I wouldn't expose that EL2 to higher temperatures than 80°C It will burn your epoxy. The fact you did a wet-lay up will cause some more problems, you will have more resin to CF ratio and its the resin that can't stand such big temperatures. The CF can... I don't know how big your part is but If its a small part I would suggest you just redo the entire part with High Temp Epoxy. Sometimes it saves you more time and money by just starting again Maybe some other members on here have some other ways of solving this problem Matthieu Libeert Founder MAT2 Composites X Sports website: www.mat2composites.com
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noble350	noble350 posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 11, Visits: 131	Hey Matthieu, Actually I want to check if high temp resin only used in places where its expected to have high stress n possibility of high temperature while using normal epoxy resin in non critical zones in order to save money when many parts are produced. M.
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ChrisR	ChrisR posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 363, Visits: 3K	Hi, one issue of trying to heat cure one section when using CF is that carbon is a very good heat conductor so if you heat one area it is likely the heat will migrate to the rest an area of the part which only has low or medium temp resin. Also, unless you are using prepreg it would be nearly impossible to avoid mixing the resins so you need to look at resin compatibility (which there will most likely be no manufacturer data for. Chris
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Warren (Staff)	Warren (Staff) posted 12 Years Ago HOT Post Details
Group: Administrators Posts: 2.5K, Visits: 8.5K	As has already been mentioned, you will have a problem of exceeding the glass transition temperature of the EL2 when postcuring the high temperature resin which may well damage the EL2 resin. Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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noble350	noble350 posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 11, Visits: 131	Thank you all for your contributions. This is how I sorted it out. I used heating tape to locally post cure the CFRP!
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