1332-07-6

Basic information

• Product Name: Zinc borate
• Synonyms: ZINC BORATE OXIDE 3.5 HYDRATE;ZINC BORATE 3.5 HYDRATE;borax2335;flameretardantzb;zb112;zb237;zn100;Zinc Borate,Fiame Retardant
• CAS NO: 1332-07-6
• Molecular Formula: B2O6Zn3
• Molecular Weight: 313.79
• EINECS: 215-566-6
• Product Categories: UVCBs-inorganic
• Mol File: 1332-07-6.mol

Chemical Properties

• Melting Point: 980 °C
• Appearance: /
• Density: 3.64 g/cm3 (20oC)
• CAS DataBase Reference: Zinc borate(CAS DataBase Reference)
• NIST Chemistry Reference: Zinc borate(1332-07-6)
• EPA Substance Registry System: Zinc borate(1332-07-6)

Safety Data

• Hazardous Substances Data: 1332-07-6(Hazardous Substances Data)

Usage

Uses

Used in Medicine:
Zinc borate is used as a fungistat and mildew inhibitor in the medical industry.
Used in Textiles:
Zinc borate is used as a fireproofing agent for textiles.
Used in Ceramics:
Zinc borate is used as a flux in ceramics.
Used in Industrial Applications:
Zinc borate (2ZnO-3B2O3·5H2O) has a greater flame retardancy than borates used alone. It is used as a flame retardant and smoke suppressant with different polymers, 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.
Used in Plastics and Rubber Processing:
Zinc borate is used as a flame retardant in plastics and cellulose fibers, paper, rubbers, and textiles. 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.
Used in Paints, Adhesives, and Pigments:
Zinc borate is used as a flame retardant in paints, adhesives, and pigments.
Used in Combination with Other Additives:
In halogen-containing systems, zinc borate is used together with antimony trioxide and alumina trihydrate. It catalyzes the 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 the presence of silica, borosilicate glass can be formed at plastic burning temperatures.
As a Partial or Complete EPA Approved Substitute:
Zinc borate is being directly applied to a wide range of plastics and rubber processing to improve flame retardant performance. It can also be applied to the production of paper, fiber fabric, decorative panels, floor leather, wallpaper, carpet, ceramic glaze, fungicides, and paint production.

Characteristics

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.

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.

Flammability and Explosibility

Notclassified

InChI:InChI=1/BHO3.Zn/c2-1(3)4;/h2H;/q-2;+2