Rohm & Hass Co., inventors of acrylic, say this about flame polishing: "Flame polishing is a fast, economical method of polishing preferred by some fabricators but cannot be fully recommended for use on acrylic because of its tendancy to cause crazing which is often not apparent until some time after the article has left the fabricator's shop."
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"Dont chance your valued items in a brittle rough edged flame polished display case! Get the most for your money! Diamond-Edge", cold-finishing is recognized as the finest acrylic display case finish in the world!