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Zinc borate

Zinc borate
Zinc borate structure
Chemical Name:
Zinc borate
zn100;zb237;zb112;borax2335;Zinc borate;Firebrake ZB;ZincBoratePure;flameretardantzb;Borsure, Zinksalz;ZINC BORATE 3.5 HYDRATE
Molecular Formula:
Formula Weight:
MOL File:

Zinc borate Properties

Melting point:
980 °C
3.64 g/cm3
CAS DataBase Reference
1332-07-6(CAS DataBase Reference)
EWG's Food Scores
EPA Substance Registry System
Zinc borate (1332-07-6)
  • Risk and Safety Statements
Toxicity Zinc borate 2ZnO3B2O3·3.5H2O has an acute oral toxicity in rats LD50 >10000 mg/kg body weight and acute dermal toxicity in rabbits LD50>10000 mg/kg body weight. It is not a skin irritant and gives a negative response in the Ames mutagenicity test (Kirk-Othmer, 1994).

Zinc borate Chemical Properties,Uses,Production

Chemical Properties

White, amorphous powder. Soluble in dilute acids; slightly soluble in water. Nonflammable.


Zinc Borate is a Boron based flame retardant compatible with many polymeric matrices. It is effective both in the solid phase and in the gas phase and its strong smoke suppressing action, helps to improve time of rescue in case of fire.
Zinc Borate is a multifunctional flame retardant:
promotes the formation of a protective vitreous layer and of a strong char layer, which reduces the formation of toxic and irritant smoke during the fire
It looses its water of hydration at temperatures above 290°C, cooling the front of the flames and subtracting energy to the fire
It acts as a synergist in conjunction with halogenated compounds, so that lower loadings of halogenated flame retardant additives are needed
It shows a strong synergic effect with antimony trioxide; in presence of alumina trihydrate (ATH) the synergic effect is enhanced
It improves resistance against electrical degradation: high anti-arcing and anti-tracking indexes
It is an afterglow suppressant.


Medicine, fireproofing textiles, fungistat and mildew inhibitor, flux in ceramics.


zinc borate is primarily used as a flame retardant in plastics and cellulose fibers, paper, rubbers and textiles. It is also used in paints, adhesives, and pigments. As a flame retardant, it can replace antimony trioxide as a synergist in both halogen-based and halogen-free systems. It is an anti-dripping and char-promoting agent, and suppresses the afterglow. In electrical insulator plastics it suppresses arcing and tracking.
In halogen-containing systems zinc borate is used together with antimony trioxide and alumina trihydrate. It catalyzes formation of char and creates a protective layer of glass. Zinc catalyzes the release of halogens by forming zinc halides and zinc oxyhalides.
In halogen-free systems, zinc borate can be used together with alumina trihydrate, magnesium hydroxide, red phosphorus, or ammonium polyphosphate. When burning the plastics, a porous borate ceramic is formed that protects the underlying layers. In presence of silica, borosilicate glass can be formed at plastic burning temperatures.
As the partial, or completely EPA approved substitute for containing halogen and other flame retardants, zinc borate is being directly applied to a wide range of plastics and rubber processing such as PVC, PE, PP, and to enhance polyamide, PVC resin, polyphenylene ethylene, epoxy resin, polyester resin, acid ethylene and natural rubber, styrene butadiene rubber, and chloroprene rubber. It can also be applied to the production of paper, fiber fabric, decorative panels, floor leather, wallpaper, carpet, ceramic glaze, fungicides, and paint production to improve flame retardant performance.

Production Methods

Zinc borate (2ZnO·3B2O3·3.5H2O) in general is produced with the reaction between zinc oxide and boric acid. Boric acid is solved in water between temperatures 95ºC and 98ºC and zinc oxide and seed crystal of 2ZnO·3B2O3·3.5H2O is added to this solution at a certain stoichiometric ratio. The reaction continues for a while by mixing and the zinc borate formed is filtered, dried and ground. The boric acid solution is fed to the system as reflux.

Industrial uses

zinc borate (2ZnO-3B2Ovl5H2O) has a greater flame retardancy than borates used alone.
Zinc compounds perform most of their flame retardant function in the condensed phase. Zinc is used with boron in the form of zinc borate, and with molybdenum in the form of zinc molybdate. Zinc borate can also be used as a flame retardant and smoke suppressant with different polymers. In the case of zinc borate, 2ZnO.3B203.3.5H20, water given off can promote the formation of a cellular char which can act as a good insulator in protecting the underlying polymer or substrate. Moore studied the effects of zinc borate on smoke reduction and flame retardancy of PVC. He reported that smoke generation can be suppressed by over 40% by proper combination of additives without an adverse effect on flame retardancy. The use of zinc borate as a flame retardant and smoke suppressant alone or with other additives, e.g. Sb203, or AI(OH)3, has found wide application in the plastics industry.

Zinc borate Preparation Products And Raw materials

Raw materials

Preparation Products

Zinc borate Suppliers

Global( 128)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21806 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 22631 55
Jiangsu Qingquan Chemical Co., Ltd.
+86-571-86589381/86589382/86589383 CHINA 154 55
career henan chemical co
+86-371-86658258 CHINA 30052 58
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 23979 58
Hubei Jusheng Technology Co.,Ltd.
027-59599243 CHINA 28235 58
Haihang Industry Co.,Ltd
+86 531 8582 1093 CHINA 9612 58
hdzhl biotechnology co., ltd
86-13032617415 CHINA 1278 58
Hubei xin bonus chemical co. LTD
027-59338440 CHINA 23048 58
BOC Sciences
1-631-614-7828 United States 20114 58

View Lastest Price from Zinc borate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2019-07-09 Zinc borate
US $1.00 / KG 1KG 99% 100kg career henan chemical co

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