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The side of the plastic formed against the mold can be controlled with close tolerances. The
side away from the mold cannot be controlled although it can be predicted what will occur on the
uncontrolled side. Tolerance requirements on the uncontrolled side are addressed by trimming or
fabrication and assembly.
We typically deal with materials ranging in thickness from .040" to .500".
Plastics that lend themselves best to thermoforming are: acrylonitrile-butadiene-styrene
copolymer (ABS), high-impact polystyrene (HIPS), high density polyethylene (HDPE), high
molecular weight polyethylene (HMWPE), polypropylene (PP), polyvinyl chloride (PVC),
polymethyl methacrylate (or "acrylic") (PMMA), and polyethylene terephthalate modified with
CHDM (PETG).
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