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Inorganic CAS 138265-88-0 Flame Retardant Chemical Zinc Borate for Plastic Rubber Coating

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Inorganic CAS 138265-88-0 Flame Retardant Chemical Zinc Borate for Plastic Rubber Coating

Brand Name : Qida FR
Model Number : 32030
Certification : ISO9001/ISO14001/OHSAS18001/RoHS/WEEE
Place of Origin : China
MOQ : 200Kg
Price : Negotiation
Payment Terms : T/T , L/C, CAD , D/P , D/A
Supply Ability : 5000T/a
Delivery Time : Two weeks after confirmation
Packaging Details : 25Kg bags
Product Name : Zinc Borate
Chemical Name : Zinc Borate
CAS No. : 138265-88-0
Formula : xZnO·yB2O3·zH2O
Synonyms : Zinc Borate 3.5 ; Zinc borate Firebrake
Appearance : White powder
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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 Retardant Chemical


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.

ZnO, %

37.0 - 40.0

B2O3, %

46 .0 - 48.0

H2O(hydrate), %

13. 0 - 15.5

Fineness (Residue on 45um sieve ) %

0.1 Max.

Specific gravity, g/cm3


Melting point ℃


Temp. of dehydration ℃


Refractive index



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 products.
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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Product Tags:

chemical flame retardants


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