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I bought some out of date autoclave (just approaching its best before date) carbon from a supplier at a very good price, it would have been rude not to. Their help desk said that it could be used OOA if the following procedure was followed. Lay up first two layers, using a roller to compress the layers firmly together, then vacuum bag for 8 hours. Unbag and add next layers and repeat until all the carbon is in the mould. Vacuum up and place in oven. Bring up to 80 deg C and dwell for 30 minutes, then continue to desired curing temp and dwell for prescribed time.
However, not all autoclave carbon is the same so I suggest that you check with your supplier to see if your stuff is suitable for OOA.
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