The coating is a twin pack chemically cured material and is non-toxic.

"Bond strengths of two ceramic brackets using argon laser, light and chemically cured resin system" Angle Orthodontist 67,3 (1997): 173-178.

Some are thermoplastic or thermosetting, others are chemically cured and are mixed with a catalyst (polyester) or hardener (epoxy) before moulding.

J122 Epoxy Stripper A non-flammable stripper formulated to remove chemically cured paint films which resist conventional paint strippers.