UD Prepreg sticking to glass plate altough using 6 layers of Easylease?

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Pier	Pier posted 6 Years Ago HOT Topic Details
Group: Forum Members Posts: 11, Visits: 22	I' m currently making tensile test samples for Unidirectional (UD) Prepreg. Therefore, I need to fabricate a 1mm thick unidirectional sheet. I used two glass plates that sandwich five layers of UD Prepreg and are vacuum baged and cured in the Prepreg oven at 100°C (see attached pic). The two glass plates were treated with six layers of Easylease coated with a 20min. separation between each coating. However, I still have the problem that the Prepreg sticks to the glass. I cannot manage to take the Prepreg sheet off the glass without braking the glass or the prepreg sheet (see attached pic). I tired this several times already. Any Idea how to resolve this? What about trying to use PVA or wax as a release agent, instead of Easylease? Looking forward fot some help Kind regards Pier
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Pier	Pier posted 6 Years Ago ANSWER Post Details
Group: Forum Members Posts: 11, Visits: 22	+x oekmont - 1/3/2018 12:13:53 PM But usually easylease should work very well. Have you cleaned the glass before applying the release agent? Maybe there is something on the glass, wich causes this issue. I really don't understand why it is not working? I cleaned the surface and even switched from tempered glass to special heat resitant glass but it does not work good enough to be called a repetitive process. The reason could be hidden in: - Glass Type - Epoxy System (in my case E320/E321/E322/E323 from SGL) - Heat Control (In my case according to Sigrapreg datasheet) - Application method - Application quantity - Panel stiffness This is what I did so far: - Varied glass type (from tempered to heat resistant glass) - Varied application method (Circular movments to linear movments) - Application method (more and less release agent) - I tried with a Mylar foil between the glass and the carbon and it worked - Changed stiffness of the panel What I noticed was, that it worked with stiffer panels like [0/90/+45/-45/+45/-45/90/0] or unidirectional 0° with a 2mm thickness. Therefore my question: - Could it be that the stiffness of the sheet influences the release of the sheet itself? Next I will try with the HP-HGR5 release agent...
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