By kei - 11/11/2014 6:16:44 AM
Hi
Until now I have been using epoxy resin to infuse my parts at home but I now have the chance to use Crestapol 1250LV urethane acrylate resin which is the system we use at work. My question is will this be compatible with the pro finish CF that is partially impregnated with a resin polymer?
I've asked easy comp's but as yet have no answer, I presume because its not a resin that's in everyday use. Does anyone here know?
Reason I want to use it is that IMO its a better resin that's cheaper and gives a more flexible / resilient product which is perfect for larger infusions like bumpers, the cure time can be changed from a standard 2hr's to 5 mins and the viscosity can be changed with heat to get a better flow on more complex parts.
Any help would be greatly appreciated.
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By kei - 11/24/2014 6:31:58 AM
Right then, did a few tests at work and results are as follows.
Materials used;
200gsm pro finish cloth
200gsm woven glass
4mm soric core
1" woven tape
Crestapol 1250LV urethane acrylate resin
results;
200gsm PF cloth and woven cloth (1 layer of each)
Perfect wet out, very low amount of resin to material ratio, resulting in very thin flexible sheet. Only downside is woven glass tried to delaminate as peel ply was removed.
200gsm PF cloth, layer of soric with picture frame of 3 layers of woven tape and final layer of 200gsm PF cloth
Perfect wet out, very low resin to material ratio, giving good strong inflexible sheet.
200gsm PF cloth folded in half (resin side to resin side)
Perfect wet out, very low resin to material ratio, perfect bond, good cosmetic finish and only slightly flexible.
In all instances resin was fed along the centre line of the part so it would flow out to sides to a glass fibre csm resin break, flow was fast and infusion of a 20cm square part was approx. 3 mins, mix ratio was 2.5% accelerator G and 2.5% of hardener using non heated resin. In a 13 degree environment on a cool aluminium bed the cure was very slow but as soon as the bed was placed in a 40 degree oven the parts all fully cured after 2hrs.
Still not sure why the woven glass tried to delaminate with the PF cloth at the edges, but with careful removal of peel ply was able to work round that. All in all a good test and confirmed that 1250lv is a perfect resin to use, have also tried it in a previously used mold intended for epoxy, built in same way as the the easy comp bonnet video using tooling resin and black gel coat and no problems there, the part pulled out fine with no bonding or damage to the molds gel coat finish.
Only downsides to this resin system are the chemicals, the accelerator and hardener are both fairly dangerous items and both should be stored and handled in a safe manner and always kept apart until mixing.
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