Zinc Borate is a multi-functional flame retardant, smoke suppressant, and anti-drip agent. It is widely used in both halogenated and non-halogenated systems to enhance fire resistance while reducing smoke and toxic gas emissions. Its unique chemistry also provides antifungal and electrical insulation properties.
| Property | Typical Value |
|---|---|
| Chemical Formula | 2ZnO·3B2O3·3.5H2O |
| CAS No. | 1332-07-6 |
| Appearance | White powder |
| ZnO Content | ≥ 37% |
| B2O3 Content | ≥ 48% |
| Decomposition Temp. | > 290 °C |
| Water Solubility (20 °C) | < 0.3% |
| Median Particle Size (D50) | ~5 μm |
| Challenge | How Zinc Borate Solves It |
|---|---|
| Too much smoke during burning | Acts as smoke suppressant in many polymers |
| Poor char formation in fire | Promotes char layer to slow down heat transfer |
| Compatibility with various polymers | Works with PVC, PE, PP, PA, PBT and others |
| Need halogen-free additive | Can be used in halogen-free systems with APP, MCA, ATH |
Q1: Is Zinc Borate toxic?
It is considered safe under normal handling and is non-halogenated. Always follow SDS for industrial use.
Q2: Can it be used with DBDPE or Deca-BDE?
Yes. It acts as a synergist with brominated flame retardants.
Q3: What dosage is typical in formulations?
Loading varies by system, but usually 3–15% depending on the polymer and synergy requirements.
