Applications
Zinc Borate Flame Retardant for Synergistic Formulations
Qingdao Pengfeng New Material Co., Ltd. supplies high-purity Zinc Borate for use in flame retardant and smoke suppression formulations across polymer and coating systems.
Zinc borate is widely used as a synergistic additive in flexible PVC compounds, rubber materials, cable formulations, engineering plastics, and intumescent coating systems. Typical addition levels range from 2–8%, depending on formulation design and application system requirements.
Application Scope
- Flexible PVC compounds (wire, cable, and technical films)
- Cable insulation and sheath formulations (LSZH and HFFR systems)
- Rubber conveyor belt compounds and heavy-duty elastomers
- Engineering plastic compounds (PP, PE, ABS, and Polyamides)
- Intumescent coating systems and protective industrial paints
- Technical wood composites and protective coating formulations
ZN Series Product Grades & Technical Specifications
Parameter | ZN-400 (Fine Particle Grade) | ZN-80 (Coarse Particle Grade) |
Median Particle Size (D50) | 3.0 – 5.0 μm | 8.0 – 12.0 μm |
Zinc Oxide (ZnO) Content | 36.5 – 39.5% | 36.5 – 39.5% |
Boron Trioxide (B₂O₃) Content | 45.0 – 49.0% | 45.0 – 49.0% |
Whiteness Index | 95 – 98 | 95 – 98 |
Bulk Density | 400 – 500 kg/m³ | 400 – 500 kg/m³ |
Aqueous Conductivity | ≤ 1500 μS/cm | ≤ 400 μS/cm |
Moisture Content | ≤ 0.50% | ≤ 0.50% |
Loss on Ignition (LOI) | 13 – 15% | 13 – 15% |
Lead (Pb) Impurity Limit | ≤ 20 ppm | ≤ 20 ppm |
Cadmium (Cd) Impurity Limit | ≤ 10 ppm | ≤ 10 ppm |
Iron (Fe) Impurity Limit | ≤ 30 ppm | ≤ 30 ppm |
Application Selection Guide
Application System | Recommended ZN Grade | Typical Addition Range | Selection & Processing Focus |
Flexible PVC Compounds | ZN-400 | 2 – 5 wt% | Fine particle distribution for optimal dispersion and clarity. |
Rubber Conveyor Belts | ZN-400 | 2 – 6 wt% | Ensures uniform filler distribution within heavy elastomer matrices. |
LSZH Cable Compounds | ZN-400 | 2 – 5 wt% | Synergistic char enhancement and smoke suppression in polyolefins. |
Intumescent Coatings | ZN-80 | 3 – 8 wt% | Coarser grade optimized for paint formulation viscosity compatibility. |
Engineering Plastics (PP, PE, ABS, PA) | ZN-80 | 2 – 5 wt% | Standard compounding systems where high shear ensures dispersion. |
Wood Protective Coatings | ZN-80 | 3 – 8 wt% | Low-viscosity coating application and cost-effective compounding. |
Technical Selection Parameters
When screening zinc borate for synergistic flame retardant systems, technical evaluation typically centers on:
- Particle size distribution (D50 / D90) matching matrix thickness
- Target core chemical composition (ZnO and B₂O₃ weight ratios)
- Moisture control thresholds preventing polymer hydrolysis during processing
- Aqueous conductivity parameters (critical for premium electrical cable formulations)
- Strict trace heavy metal impurity limits (Pb, Cd control for RoHS compliance)
- Interfacial wetting characteristics and system dispersion viscosity requirements
Sample Supply and Technical Documentation
- Laboratory evaluation aliquots for ZN-400 and ZN-80 available upon request
- Regulatory compliance documentation (REACH, RoHS, and Halogen-Free statements)
