In Reply to: compression moulding of acetals posted by dharmesh sachdev on 12/03/02 at 3:29 PM:
This is a very difficult problem. Thermoplastics are very insulative, and the molten material stays hot for a long time in these thicknesses. Both these materials are crystalline, which means they will shrink more the longer they stay warm.
Quandrant Engineering Plastic Products in Reading, Pennsylvania, USA has worked around this problem by reacting nylon in the mold. This way they avoid the issue of excessive shrinkage and outgassing associated with large thicknesses.
Sorry I can't be more helpful.