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Hey guys, i need a help  last week i start to play with infusion, first i decided to make some tests on glass i made 3 tests and still have some tiny pinholes in my "parts", in first look they looks nice and shiny, but under sun u can see small dots inside the laminate. as i say, i did 3 tests, and after every one was better, but still not nice in every infusion i made few diferent sheets cca 20x20cm (4x200g twill weave, 1x200g+1x420g, 2x200g+soric 2mm,...) 1.INFUSION: cloth, peelply, infusion mesh, spiral tube,... Infusion was very fast, next day tiny pinholes in whole parts 2.INFUSION: the same, just excluded spiral, and made resin break, and leave the resin to degas around 10mins...better result, but still loads of pinholes in 75percent of part 3.INFUSION: infusion mesh-only small pieces under silicone connectors, i clamped out vacuum line first and wait for 20seconds, then clamped a resin line, resin was degassed for 10-15mins... 2/3 of part nearly without pinholes(maybe 1 small bubble every 8cm, but 1/3 of part, under the resin feed line is still full of pinholes  in every infusion i made leak test, and bag was always tiny, without leaks i am using all infusion stuff from EC, except vacuum pump...... I cant reach -30inHq on gauge, there is always -29  What do u think guys, can be this cause of my issues? |
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Group: Administrators
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Slow down the resin feed by partly clamping the line clamp. Especially with small parts, the resin will fly across the surface mesh and it will seem done without it soaking down to the surface. Also shut the vacuum line before the resin feed as it allows a small amount of extra resin in which helps with pinholes. For bigger parts you will likely still need the mesh and spiral.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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Group: Forum Members
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Thank you Warren! I wil try it today Do u think my pump is ok with -29inHq on gauge?
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Group: Administrators
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depends on the accuracy of the gauge. Uncalibrated gauges can vary a bit as well as variance at altitude. If you shut the valve on the pump and the tone does not change, then you are likely at full vacuum.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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