Inflatable bladder vs foam core

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Tony2125	Tony2125 posted 8 Years Ago HOT Topic Details
Group: Forum Members Posts: 12, Visits: 59	I am looking to build an inflatable bladder with welded polyéthylène bag. I did many trials and had difficulties to get the bladder sealed perfectly, at some points of the welding line. Basically I tried to duplicate this technique https://www.youtube.com/watch?v=STj0eqDpafo Having build a split mold, I was wondering if I could build a core with expandable PU foam on both side of the mold, then glue the two foams together to get a core that has the perfect inner shape of my mold. I think some bike makers use this kind of core but in PS to build bike frame. https://www.edge-design.com.tw/EPS.html Would the PU foam be something compatible with prepreg and curing temperature ?? Also I am not sure PU or PS expand with temperature increase
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