Zinc Borate
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Product Description
Zinc Borate
Chemical Name: Zinc Borate; CAS 1332-07-6/138265-88-0
Cas No.: 1332-07-6/138265-88-0
EINECS No.: 215-566-6
Chemical Formula: 2ZnO·3B2O3·3.5H2O
Molecular Weight: 434.75
Melting point≥: 980°C
Relative Density: 2.67
Density: 3.64 g/cm3
Molecular Structure:
Description
Zinc Borate is a white powder. It is soluble in dilute acids; slightly soluble in water. Nonflammable. It 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.
Zinc Borate Standard
Appearance: White powder
B2O3 Content (%): 45-49
ZnO Content (%): 35-39.5
Loss on Ignition (%): 13.0-15.5
Water (%) ≤: 0.8
Whiteness (%) ≥: 90
Sieve Residue ≤: 1.0
Pb ppm ≤: 20
Cd ppm ≤: 5
As ppm ≤: 2
Cr ppm ≤: 5
Average particle size μm： 2-5
Refractive index: 1.58-1.59
Application
1. 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.
2. 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.
3. 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.
4. 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.
Storge & Handling
Store in tightly closed containers in a cool, well-ventilatedarea away from heat, strong oxidizers, acids. Store separately from food ingredients, BRF3 and chlorinated rubber.
Packing
25KG/BAG in a paper-plastic bag