| 简介 |
An alarm in a fire detection system, comprising a casing, as well as a circuit substrate and a state detecting portion that are disposed within the casing, wherein : the casing comprises the following components in parts by mass : polypropylene : 10-15 parts; titanium dioxide : 1-3 parts; alkylphenol polyoxyalkylene ether : 2-5 parts; sodium dodecyl benzene sulfonate : 1-3 parts, polyethylene resin : 20-30 parts, polybutylene terephthalate (PBT) resin : 20-30 parts, ethylene butyl acrylate copolymer : 10-15 parts, rare earth composite stabilizer : 1-3 parts, flame retardant : 5-7 parts, reinforcing material : 2-5 parts, foaming agent : 2-4 parts, dispersing agent : 5-10 parts, thickener : 5-10 parts, anti-mildew bactericide : 1-2 parts, composite rare earth : 0.5-0.6 parts; the alarm performs well, has a long service life and is low cost. |
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