Vikrell and Tere-Stone: Fiberglass or Acrylic?

I just had a Vikrell shower/tub and a Tere-Stone vanity installed. For the purposes of care and scratch removal I would like to know if these two materials are fiberglass or acrylic. I can not tell from looking at the manufacturer's websites and previous postings do not address this issue or are contradictory. TIA.
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