Inorganic CAS 138265-88-0 Flame Retardant Chemical Zinc Borate for
Plastic Rubber Coating
Zinc borate is an inorganic compound, a borate of zinc. It is a
white crystalline or amorphous powder insoluble in water. Its
toxicity is low. Its melting point is 980 °C.
Inorganic Chemical; Flame retardant; Inorganic Additive Fire
Index / Item
Zinc borate 2335 ( 2ZnO .3B2O3 . 3.5H2O )
95 Min. or 99 Min.
Surface water %
1.0 Max. or 0.5 Max.
Particle size, um
1 - 10
20 Max. or 10 Max.
10 Max. or 5 Max.
37.0 - 40.0
46 .0 - 48.0
13. 0 - 15.5
Fineness (Residue on 45um sieve ) %
Specific gravity, g/cm3
Melting point ℃
Temp. of dehydration ℃
Zinc Borate is one multi-functional synergistic flame retardant
with Antimony Oxide etc additives in polymers to improve flame
retardant performance, it can reduce smoke evolution and adjust the
balance of flame retardant properties versus mechanical, electrical
and other properties.
Zinc Borate is widely used in PVC applications such as carpet,
conveyor belt, wire and cable, and in Nylon, PE, PP etc engineering
plastics of halogen free flame retardant systems based on Al(OH)3
and Mg(OH)3, intumescent coating and painting, ceramic glaze, milk
glass, decorative paper etc fields.
Zinc Borate is also used in wood composite as fungicide to prevent
from decay fungi and subterranean termites .
Zinc borate is used in polyvinyl chloride, polyolefins, polyamides,
epoxy resins, polyesters, thermoplastic elastomers, rubbers, etc.
It is also used in some intumescent systems.
Zinc borate has synergistic effect with zinc phosphate or barium
borate as a corrosion inhibitor pigment.
Zinc borate acts as a broad-spectrum fungicide in plastics and wood
Zinc borate can be used as a flux in some ceramics. In electrical
insulators it improves the ceramics properties.
Nanopowder zinc borate can be used for the applications above, and
also for improving the frictional properties of lubricating oils.
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