California Technical Bulletin (TB 133)
TB 133 originated in California, but other states have begun to adopt its strict guidelines aimed at promoting public safety.
- TB 133 is a flammability test for upholstered seating for use in spaces/ buildings considered to be in public, including healthcare facilities, daycare centers, restaurants, hotels and penal institutions.
- Special materials, including barrier wrap and/or CMHR foam, are used to comply with TB 133. Martin Brattrud must be consulted to obtain pre-approval for fabric and leather to be used on orders requiring TB 133 compliance.
- The up-charge for TB 133 construction is 20% for each chair or sofa. Purchase orders requesting TB 133 certification will require a full-scale burn test of a finished furniture piece identical to the unit to be installed on the job site.
- The fabric to be tested must be supplied by the client. The charge for certification is $875 NET test/per item, which includes manufacturing and testing of the sample to be ignited.
- Laboratory testing adds 3-4 weeks to Martin Brattrud standard lead times. Purchase orders will not be placed in production until mock-up has passed TB 133.
- Barrier wraps, flameproofing and/or CMHR foam affect the hand, sit and look of most styles. The special materials used to obtain TP 133 compliance or certification will yield a firmer seat and less supple hand.
- Purchase orders must clearly stipulate the need for TB 133 compliance or certification. It is the specifier’s responsibility to check with local agencies for flammability and other code requirements.
- Martin Brattrud can supply Combustion Modified High Resiliency (CMHR) foam for select styles. Please contact the factory for pricing.
All MB seating is made in accordance with the California Bureau of Home Furnishings Bulletin #117-2013. The California Flammability Regulation #117-2013 is a set of minimum allowable standards of flammability to which all upholstered furniture sold in the State of California must comply.