Zinc borate 2335 (chemical formula: 2ZnO·3B₂O₃·3.5H₂O), with a molecular weight of 434.62, is a white crystalline powder inorganic flame retardant.
It can be used as smoke and afterglow suppressant, and anti-arcing agent in PVC, nylon, polyethylene, PP polyesters, thermoplastic elastomers and rubbers. We can supply the best quality cargo and service.
① Polymer materials field
② In the field of coatings and adhesives
③ Building materials and insulation materials field
④ Engineering plastics field
⑤ Electronic and electrical field
⑥ Automotive industry field
⑦ Wire and cable field
⑧ Industrial rubber parts field
⑨ Lithium battery flame retardant field
⑩ Aerospace materials field
⑪ Steel structure fireproof coating field
| 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 |
1. Do not exceed the dehydration point of zinc borate 2335. If your processing temperature is high, you require a flame retardant with high temperature resistance, or you do not want it to release water of crystallization, we suggest you consider another anhydrous borate. Flame retardants with 3.5% water of crystallization generally begin to lose water at 290–320°C. Consider whether your processing temperature is between 220–260°C, which is more suitable.
2. Regardless of which flame retardant is added to the polymer, we recommend thorough dispersion, including zinc borate. Poor dispersion directly results in poor and uneven flame retardant performance, affects the mechanical strength of the substrate, and may also cause localized whitening.
3. The dosage will vary depending on the system, but we do not recommend adding too much ZB2335. You can contact Taixing to determine the specific formulation for you, including the dosage and whether it should be used in combination with other flame retardants. We will provide you with specific confirmation.
4. Finally, regarding storage, you can wholesale flame retardants from us. For the portion requiring storage, avoid prolonged exposure to high temperature and humidity environments. Once opened, use it as soon as possible. While hydrated zinc borate has a stable structure, it cannot completely prevent the adsorption of moisture over a long period of time.
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