Guardian Fire Testing Laboratories, Inc. is an independent testing laboratory devoted to the business of providing impartial testing for a variety of building products used in residential and commercial construction such as: fire door assemblies; adhesives, floor/ceiling assemblies, wall assemblies; expansion joints; tile; particle board; fiberboard; interior finish materials; textiles, films, chimney liners (timed fire endurance and flame spread); record protection equipment; solid fuel heating appliances of all kinds (safety and performance). Standards tested to include the following:

UL-263, ASTM E-119; NFPA 251; ULC-S101; UL 1479, ASTM E-814; ULC-S115; ASTM E1966; UL-2079; UL-10B; UL-10C; ASTM E 152-81; NKFPA 252; UL-1715; UL-72; NKFPA 232; UL 63-1976; UL-1482; ULC-S627; CSA-B366.1; UL-391; UL-1777; NFPA 705; ULC-4-8113, ASTM-E-84; ULC-S102, ASTM-E-2226.