intumescence


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intumescence

[‚in·tü′mes·əns]
(materials)
The property of a material to swell when heated; intumescent materials in bulk and sheet form are used as fireproofing agents.

intumescence

The process of swelling up, as with the application of heat, such as vermiculite that is heat-treated for use in thermal insulation.
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References in periodicals archive ?
Between 300 and 500[degrees]C, MEL decomposed and the development of intumescence occurred at the same time.
gouazoubira is an elongated and cylindroidal mass, dorsoventrally flattened, with two dilatations called the cervical and lumbar intumescences, like those of other animals (Figures 1 and 2).
Carbonization Mechanisms Resulting from Intumescence Association with the AMMONIUM Polyphosphate-Pentaerythritol Fire Retardant System.
Jones, "Nanocomposites: Radiative Gasification and Vinyl Polymer Flammability," in Fire Retardancy of Polymers: The Use of Intumescence, M.
Non Halogen * Alumina trihydrate * Magnesium hydroxide * Zinc borate * Phosphorus * Intumescence
Intumescence is usually referred to as the formation of an expanded superficial char layer acting as a physical barrier to reduce heat and mass (fuel and oxygen) transfer between the gas and the condensed phases (2).
Since several different types of mechanisms are employed, including condensed-phase reactions and intumescence, the amounts of gases evolved are significantly lower than reaction mechanisms employing gas-phase reaction such as halogen/antimony flame retardants.
Wilkie, "Influence of High Energy Radiation on the Thermal Stability of Polyamide-6," in Fire Retardancy of Polymeric Materials, the Use of Intumescence, M.
The intumescence combined with the melting fiberglass go from an amorphous substance to a vitreous refractory silica that reportedly can withstand temperatures up to approximately 4000[degrees]F, and the metallized polyester film on the bubble wrap as well as the polyethylene of the bubble wrap start softening and form a thin film made up of both components.
Conversely, an unfilled (v = 0), non-charring ([mu] = 0) polymer with or without a nonconducting filler would have [theta] [approximately equal to] 1, while a charring polymer would have [theta] < 1, and those exhibiting intumescence (volumetric expansion of a char layer) would have [theta] [much less than] 1.
Once again, after initial excitement, interest in intumescence was less than anticipated.