process for the production of solid materials with a flashpoint of less than 500grad c, the fire alarm - ausloesend bzw.feueralarm-ausloesend and selbstverloeschend orfire alarm - ausloesend, selbstverloeschend and feuerunterdrueckend are

摘要

Solid materials having a flash point of less than 500 DEG C. are rendered fire alarming by providing for the presence thereon of micro capsules containing a bromofluoroalkane having a critical temperature of at least 100 DEG 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 bromofluoralkane suddenly at a predetermined temperature to provide a detonation having a maximum sound level of 10-12 kHz.