High quality flame retardant China manufacturer /supplier in China , Zinc Borate (ZB2335,ZB3.5H2O) (2ZnO·3B2O3·3.5H2O CAS NO. 138265-88-0/ 1332-07-6 ) Anhydrous Zinc Borate ( ZB23) CAS No. 12767-90-7 supplier since 1998.
Zinc Borate (ZB2335,ZB3.5H2O) (2ZnO·3B2O3·3.5H2O CAS NO.1332-07-6 / 138265-88-0) is produced by boric acid process with high purity, high content of ZnO and B2O3 and high thermal stability. zinc borate flame retardant is used as an environmentally-friendly additive halogen- free flame retardant and smoke suppressant in various polymer systems in engineering plastics, rubber based compounds such as hose, conveyor belt, coated canvas, FRP, wire and cable, electrical components, coating and painting, etc.
Anhydrous zinc borate (CAS No. 12767-90-7) is prepared by removing crystal water from 2ZnO·3B2O3·3.5H2O at high temperature. Compared with other zinc borate, it has higher thermal stability and can be used at higher processing temperatures .Anhydrous zinc borate is used for polymer flame retardant systems with high processing temperature requirements such as high-temperature nylon, polyester, polyetherketone, polysulfone, and fluoro polymers whose processing emperature is higher than 290°C.
From the appearance, zinc borate appears in the form of white fine powder, with uniform texture and pure color, giving people a high-quality intuitive feeling. This delicate texture is not only convenient for storage and transportation, but also easier to mix evenly with other materials in practical applications, providing convenience for subsequent processing and production.
In terms of physical properties, zinc borate has a low density, approximately between 2.67-2.78g/cm ³, which allows it to be added to various materials without significantly increasing the weight of the product, making it advantageous in applications with strict weight requirements. At the same time, it also has good thermal stability and can withstand a certain degree of high temperature without decomposition or deformation. It can usually remain stable below 300 ℃, which makes it stable in high-temperature processing technology and ensures that product quality is not affected.
In terms of chemical properties, zinc borate is a weak acid weak base salt with a certain buffering effect. It has low solubility in water, strong chemical stability, and can maintain its structural and performance stability in different chemical environments. In some specific chemical reaction systems, zinc borate can also play a catalytic role, promote the progress of the reaction, and exhibit good chemical activity and selectivity.
Zinc borate has a wide range of applications, with its leading role being in the field of flame retardancy. It is an environmentally friendly flame retardant and flame retardant enhancer with excellent performance. When used in combination with other flame retardants such as aluminum hydroxide, magnesium hydroxide, etc., it can produce a strong synergistic effect. During the combustion process of materials, zinc borate decomposes upon heating, and the resulting borides form a glassy protective film on the surface of the material. This protective film can isolate oxygen and heat, prevent the escape of flammable gases, and effectively suppress the spread of combustion. This efficient flame retardant performance has made it widely used in many materials such as plastics, rubber, fibers, coatings, etc., to safeguard people's lives and production safety. Zinc borate plays a crucial role as a flux and additive in the ceramic and glass industries. It can lower the melting temperature of ceramics and glass, promote the sintering process, and improve the mechanical strength and chemical stability of the product. At the same time, it can also improve the optical properties of glass, making it more transparent and uniform, enhancing the quality and aesthetics of glass and ceramic products. In the electronics industry, zinc borate is used as a packaging material for manufacturing electronic components. It can improve the insulation performance, thermal stability, and chemical corrosion resistance of packaging materials, ensuring stable operation of electronic components in complex environments and extending the service life of electronic devices.
| Items | Unit | ZB-2335 |
| Appearance | - | White Powder |
| B2O3 | % | 47.0 ～ 49.0 |
| ZnO | % | 37.5 ～ 39.5 |
| Moisture | % | ≤0.3 |
| Loss on Ignition | % | 13.0~15.5（450℃) |
| Whiteness | % | ≥96.0 |
| Particle Size,D50 | µm | ≤7.0 |
| TGA(1%) | ℃ | ≥345 |
| Chloride(Cl- ) | % | ≤0.05 |
| Sulphate(SO42-) | % | ≤0.005 |
High Purity: >99%
High Whiteness：≥96%
High Decomposition Temperature：the TGA(1%) is over 345℃ , allow high thermal processing.
Low Cl- %, Low SO42-%：Cl-≤300ppm, SO42-≤50ppm.
No white precipitate during product use.
Application:Recommended to be used in engineering plastics, rubber based compounds such as hose, conveyor belt, coated canvas, FRP, wire and cable, electrical components, coating and painting, etc.
Packaging:Net weight 25kg/bag, Compound paper-plastic bag
Storage and Attention:Keep in dry, room temperature and moisture proof condition, preventing the heating.
| Items | Unit | ZB23 |
| Appearance | — | White Powder |
| B2O3 | % | 52.0 ～ 56.0 |
| ZnO | % | 42.0 ～ 44.0 |
| Whiteness | % | ≥92.0 |
| Moisture | % | ≤0.5 |
| Loss on Ignition(400℃ ) | % | ≤1.5 |
Key advantages: High decomposition temperature , Loss on Ignition is less than 1% at 400℃ , and it can be used in high temperature processing
Packaging :Net weight 25kg/bag, Compound paper-plastic bag
Storage and Attention: Keep in dry, room temperature and moisture proof condition, preventing the heating
