Xpreg xc110

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Xpreg xc110

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Thomb	Thomb posted 6 Years Ago HOT Topic Details
Group: Forum Members Posts: 23, Visits: 656	Hi all, Im still having some problems with the xpreg in gelcoat moulds. When i use aluminium moulds all is good. When i use the high temp gelcoat moulds i always get a dry finish on the mould side. I tried some longer times and diffrent temperatures but i keep getting these results. I only use breather underneath the mould but that always worked for me and only the bag where it it packed in to press on the carbon. Does anyone have a clue what could be it or what i can try? Edited 6 Years Ago by Thomb
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Hanaldo	Hanaldo posted 5 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	+x Chris Rogers - 1/2/2020 7:26:33 PM What are you using for a bag stack - peel ply, perf film, breather - on top of the laminate? You mentioned using breather under the mold - not sure what you mean... you need a way for the air to escape so a breather ply over the peel ply and perforated release film is necessary. Totally agree on the heat ramp idea - resin viscosity vs cure onset temperature could be a problem. The slower the ramp rate the lower the resin viscosity gets before gel starts. Seems you tried that. Mold surface finish can effect surface tension and the ease with which air escapes the mold surface... metal molds always seem to leave nicer finishes... or at least fewer pinholes. The small sample suggest an air-entrapment or moisture issue. Is the part only one layer? Did you debulk the first ply into the mold before laying up more? What is the release coating? XC110 requires an unperforated release film with the breather only on the back of the mould. But unusual, but can confirm it works perfectly like this. Thomb, your test result is very interesting. Was this sample made with the exact same batch of pre-preg that you have been using to make the parts with?
	Reply Like 5
Thomb	Thomb posted 5 Years Ago HOT Post Details
Group: Forum Members Posts: 23, Visits: 656	+x Hanaldo - 1/3/2020 5:03:23 PM +x Chris Rogers - 1/2/2020 7:26:33 PM What are you using for a bag stack - peel ply, perf film, breather - on top of the laminate? You mentioned using breather under the mold - not sure what you mean... you need a way for the air to escape so a breather ply over the peel ply and perforated release film is necessary. Totally agree on the heat ramp idea - resin viscosity vs cure onset temperature could be a problem. The slower the ramp rate the lower the resin viscosity gets before gel starts. Seems you tried that. Mold surface finish can effect surface tension and the ease with which air escapes the mold surface... metal molds always seem to leave nicer finishes... or at least fewer pinholes. The small sample suggest an air-entrapment or moisture issue. Is the part only one layer? Did you debulk the first ply into the mold before laying up more? What is the release coating? XC110 requires an unperforated release film with the breather only on the back of the mould. But unusual, but can confirm it works perfectly like this. Thomb, your test result is very interesting. Was this sample made with the exact same batch of pre-preg that you have been using to make the parts with? Yes same prepreg same mould same times.
	Reply Like 5