Fibreglass vacuum moulding.
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This video shows a simple closed mould vacuum process, this technique is more beneficial to the GRP moulder if runs from 100+ are needed, expected life of tooling 3,000 — 5,000 lifts.
During an eight hour cycle 7 parts can be produced, depending upon complexity of moulding. Источник видео youtube.com/watch?v=MWUxhC6-q0c