What Is Zinc Borate and Why Is It Used in Flame Retardants

Zinc borate is an inorganic compound widely used in the plastics and rubber industries. It plays a critical role in improving the fire resistance of materials, especially where halogen-free flame retardant systems are required.

What Is Zinc Borate

Zinc borate is a white powder composed of zinc and boron atoms combined with oxygen and water molecules. It is chemically stable and has a high decomposition temperature, making it suitable for use in various industrial applications.

Flame Retardant Properties

One of the main applications of zinc borate is as a flame retardant. When exposed to high temperatures, it releases water vapor and forms a protective glassy layer. This helps:

- Delay ignition

- Reduce smoke generation

- Prevent the spread of flames

Zinc borate is often used in combination with other flame retardants such as aluminum hydroxide or magnesium hydroxide to enhance performance.

Halogen-Free Advantage

In the past, halogen-based flame retardants were widely used, but they pose environmental and health concerns. Zinc borate provides a safer alternative for making materials flame resistant without relying on halogens.

Other Applications

In addition to flame retardancy, zinc borate also provides:

- Fungus and mildew resistance

- Corrosion resistance

- Smoke suppression

These properties make it suitable for use in PVC, rubber, paints, textiles, and even electronics.

Conclusion

Zinc borate is a versatile and effective flame retardant additive. As industries continue to seek safer and more environmentally friendly fire protection solutions, zinc borate remains an essential component in modern material science.