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== BANNED MATERIALS (NEVER USE THESE) == These materials '''must not be used in the laser cutter'''. '''NOTE NEW ADDITION (2023-10):''' MDF is now banned. {|border="1" cellpadding="5" cellspacing="0" |- ! colspan="10" bgcolor="#ccc" | Bad materials |- ! Material ! Notes |- | PVC || Contains chlorine. Will produce hydrogen chloride gas when used which is extremely toxic and also damages the laser optics. |- | Vinyl || Most contains chlorine. Will produce hydrogen chloride gas when used which is extremely toxic and also damages the laser optics. |- | PVC Foams || Most contains chlorine. Will produce hydrogen chloride gas when used which is extremely toxic and also damages the laser optics. |- | Foam Core || Usually made with PVC which is harmful as listed above. |- | Styrofoam || Can cause flash fires |- | Polycarbonate || Does not cut. TAP plastics sells both this and acrylic. '''Be sure to read your labels when purchasing material'''. Lexan is the trade name for Polycarbonate, while Plexiglass is the trade name for acrylic. |- | ABS or PETG || Gives off hydrogen cyanide which can kill you and also may damage the laser optics. |- | Fiberglass || Contains complex epoxies which will cause fires, chlorine, and cyanide. Also contains glass which will not cut. |- | Metals || Cannot be etched by this type of laser. Also is harmful as the reflective surface may cause the laser to be reflected back up to the head, damaging it. If someone claims to be etching metal using this type of laser then they are etching a metal with a plastic coating, anodized surface, or some other etchable surface on top. |- | MDF/fiberboard || Made of sawdust bound with glue, so it clogs filters so much that it's not excellent to other laser users. Use solid wood (or plywood, which uses much less glue) instead, or cut with the CNC or woodshop tools. Remember to follow proper dust-collection procedures when using those tools on MDF! |}
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