Purge material
Vol. 23 #1, May 1996
Reground cast acrylic makes an excellent purge material for extruder screws. It does not completely melt if run with barrel zones set under 400 degrees F and aggressively scours the screw.
Do not purge dies with it, however, since its high content of solids and high viscosity will produce dangerously high pressures and can damage delicate die surfaces and profiles. Only use cast acrylic purge with an open discharge.
See also
Nylon purge
Purge
Purge 2
Purge compound
Purging gels
Purge - close vent