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...Fire code terminology related to tests background minnesota and building codes use that often sounds like the same thing for instance terms such as non combustible resistant retardant flame fireproof sound they mean pretty much but don t this information sheet will help explain differences also describe test methods apply each term construction means material ignite burn examples of materials are wood paper plastics fabrics etc very common in furnishings furniture it is impossible make a by applying after market chemicals or treatments not release flammable vapors when exposed heat include steel masonry ceramics certain insulating fiberglass mineral wool insulation gypsum wallboard considered be although does have thick backing most class spread rating allowing them used walls ceilings resistance rated refers ratings s floors wall intended contain inside compartment prevent from spreading period time would two hour minute door treated coatings charring decomposition plywood lumber can ...