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Does anyone have experience in use of absorbed H2O as a reversible plasticizer for creep forming of acrylics?

> Much of the cycle time is probably very slow heating and cooling of the thickness. While heat/cool time is relevant, in this case the forming is done at 218F to stay (just) below the 3% relaxation point, so the time required is obviously not as great as it would be at 330F. A majority of...

Thank you to all for the various inputs. Our task, new to us but a technology that was first developed in the 50s and 60s, is to "thermo"form MIL-P-25690 70%-biaxially-stretched acrylic (commercial example = Spartech Polycast 2000) into specified 3D shapes at a temperature below that which will...

Another idea...does anyone have experience with using high-level ultrasound integrated into a forming press for amorphous plastics, to depress Tg?

We need to precisely "thermo"form a ~half inch thick aerospace acrylic sheet with Class A surfaces at no hotter than 218F, which is well below its Tg. We're willing to build custom equipment of any complexity to accomplish this. Has anyone got experience with using say 300psi of isostatic...