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Fire polishing, also known as flame polishing, is a method of polishing a material, usually glass or thermoplastics, by exposing it to a flame or heat. When the surface of the material briefly melts, surface tension smooths the surface. Operator skill is critical with this method. When done properly, flame plastic polishing produces the clearest finish, especially when polishing acrylic. This method is most applicable to flat external surfaces. Flame polishing is frequently used in acrylic plastic fabrication because of its high speed compared to abrasive methods. In this application, an oxyhydrogen torch is typically used, one reason being that the flame chemistry is unlikely to contaminate the plastic.
- Fire hardening, also known as "fire polishing", a primitive process for hardening wood
- Harper, Charles A.; Petrie, Edward M. (2003-10-10). Plastics Materials and Processes: A Concise Encyclopedia. John Wiley & Sons. ISBN 9780471459200.
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