Capsules of bromofluoroalkane as fire alarm

G - Physics – 08 – B

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31/105, 117/32,

G08B 17/00 (2006.01) A62D 1/00 (2006.01) A62D 1/06 (2006.01) C08J 9/00 (2006.01) C08K 9/10 (2006.01) C09D 5/18 (2006.01) C09K 21/14 (2006.01)

Patent

CA 1115040

ABSTRACT Solid materials having a flash point of less than 500°C are rendered fire alarming by providing for the presence thereon of micro capsules containing a bromofluroalkane having a critical temperature of at least 100°C, the micro capsules having an external diameter of from 200 to 260 microns, and the wall of the capsules consisting of a polymer, treated to release the bromofluoroalkane suddenly at a predetermined temperature to provide a detonation having a maximum sound level of 10-12 kHz.

317137

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