FIREBRAKE Fire Retardants

Fire Retardant Glass-Reinforced Polyamide 6,6 Containing Firebrake ZB (Antimony Oxide-Free)... 

Zinc borates are predominately a condensed phase fire retardant. In a halogenated system such as flexible PVC, it is known to markedly increase the amount of char formed during polymer combustion whereas the addition of antimony trioxide, a vapor-phase flame retardant, has little effect on char formation. Analyses of the char show that about 80%-95% of the antimony is volatilized, whereas the majority of the boron and zinc from Firebrake ZB remains in the char (80% and 60%, respectively).48-56 The fact that the majority of the boron remains in the condensed phase is in agreement with the fact that boric oxide is a good afterglow suppressant. The mode of action can be summarized in the following equation (not balanced). 

Alcanex FR 100 Alcanex FRC 600 Bonrex FC Borax 2335 Boric acid, zinc salt Climax ZB 467 EINECS 215-566-6 EPA Pesticide Chemical Code 128859 Firebrake ZB Firebrake ZB 500 Flamtard Z 10 FRC 600 HSDB 1046 JS 9502 SZB 2335 XP1187 ZB 112 ZB 237 ZB 467 Lite Zinc borate ZN 100 ZSB 2335 ZT ZT (fire retardant). Medicine, fireproohng textiles, fungistat, mildew inhibitor. Zinc Borate 2335 (Borax Consolidated Ltd) is a specialty flame retardant additive to plasticized PVC and other polymers to reduce afterglow and smoke. Solid mp = 980° d = 3.64 insoluble in H2O, slightly soluble in dilute acids. BA Cham. Ltd. Borax Consolidated Ltd Borax Europe Ltd Climax Performance U.S. Borax. 

Firebrake ZB-XF fire retardant la intended to replace Fire-brake ZB-Fine for use in applications that require maximum fire test performance results and critical physical properties such as In thin film forming. In contrast to Firebrake ZB-Flne, the XF grade has no particles greater than 12 microns, as determined by Laser Diffraction technique. 

Some characteristics of borates are given in Table 2. FIREBRAKE ZB has been used as a fire retardant in PO wire and cables as well as electrical parts. It improves elongation properties of PO, crosslinked EVA-electrical parts, etc. [22]. 

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