Vacuum Assisted Casting. PU resin selection Polyurathene resin usually available as a two-part liquid set Cured resin can be  As soft as rubber  As.

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Presentation transcript:

Vacuum Assisted Casting

PU resin selection Polyurathene resin usually available as a two-part liquid set Cured resin can be  As soft as rubber  As hard as ABS  As clear as Acrylic  As heat-resistant as PC  Filled with copper powder or glass fiber

Colouring of PU resin Natural PU resins are usually black, white, ivory, or transparent White or transparent can be dyed by acrylic paint or model paint All hard PU can be primed and spray painted

Vacuum PU casting machine

Automatic and manual casting Automatic and manual machine work on the same principle Automatic machine can degas, mix, pour, and re-pressurise according to pre- programmed timing

Casting setup

PU Curing Curing temperature  Heat can accelerate PU curing, ideally newly cast PU should be transfer to oven set to about 50 deg. C  some PU will not even cure in room temperature De-mould time  Range from 5 min. to 30 min. Cure time  Time to reach optimum strength  Range from 30 min. to 12 hr.

Post-processing issues Cut away the runner by saw or cutter Wash in warm water to remove trace of chemical on the surface Hard resin can be machined, filed, and sanded Primed and spray painted like ordinary plastic prototypes