Because of the relatively low thickness of this intumescent coating ( usually in the 350-to 700-micrometer range ), nice finish, and anti-corrosive nature, intumescent coatings are preferred on the basis of aesthetics and performance.
32.
Ammonium polyphosphate ( APP ) is also used as a flame retardant in many applications such as paints and coatings, and in a variety of polymers : the most important ones are polyolefins, and particularly polypropylene, where APP is part of intumescent systems.
33.
Exceptions to that particular rule of thumb are fire dampers ( fire-resistive closures within air ducts, excluding grease ducts ) and fire door closers, which " must " move, open and shut in order to work, as well as all intumescent products, which swell, thus move, in order to function.
34.
Although low voltage cabling does not require inspection or training to install in some jurisdictions, it is still important for installers to be aware of specific electric code safety rules such as how to correctly penetrate building fire barriers and use firestop putty ( intumescents ) to prevent a low voltage cable from reducing building fire protection and increasing the risk of injury or death for building occupants.
35.
The term fire check is used to specify doorsets ( door and frame ) to meet regulation requirements for controlling the spread of fire and smoke : " Fire-check doors are those which either comply with the construction specification given in BS 459 : Part 3 or have given an equivalent performance in fire tests, fire resisting doors have a higher standard of integrity . From googling I note an [ http : / / www . mslfirecheck . com / intumescent paint and a plasterboard maker using the term for their fire resisting products, but that's not normal usage as far as I know . . . . dave souza 17 : 50, 3 December 2005 ( UTC)
