Zinc borate 3.5H₂O is a highly active flame retardant and efficiency enhancing additive produced by Taixing. Its core advantage lies in the stable loading of 3.5 molecular crystal water, which distinguishes it from the shortcomings of easy dehydration of pentahydrate zinc borate and weak synergy of monohydrate zinc borate. It achieves a triple balance of heat absorption efficiency, synergy performance, and processing adaptability. Specially designed to address the pain points of low flame retardant efficiency, high smoke emissions, and difficult cost control in materials such as plastics, rubber, and fire-resistant coatings, it can be compounded with magnesium hydroxide, aluminum hydroxide, and phosphorus nitrogen flame retardants to significantly enhance the carbonization and smoke suppression capabilities of the flame retardant system. It is a core additive for the production of high-end flame retardant products.
Precise hydrothermal crystallization+surface activation process
Adopting closed-loop temperature control hydrothermal synthesis technology, precise control of reaction pressure and temperature, enabling stable loading of 3.5 molecules of crystal water on zinc borate crystals, avoiding performance differences caused by fluctuations in crystal water content; Matching fatty acid ester surface activation treatment forms a hydrophobic film on the crystal surface, enhancing its dispersibility and compatibility in polymer substrates, solving the problem of inorganic additive aggregation, and improving the synergistic flame retardant efficiency by more than 40% compared to unactivated zinc borate. The particle size distribution of the product is concentrated in 3-7 μ m, with a regular prismatic crystal morphology and a specific surface area of 12-18 m ²/g. The number of active sites far exceeds that of ordinary atmospheric crystallization products.
1. Graded heat absorption and cooling: When the material is heated to 285 ℃, the crystal water in zinc borate 3.5H₂O is removed step by step, and each gram of product can absorb about 350J of heat, rapidly reducing the surface temperature of the substrate, inhibiting the thermal decomposition process of the polymer, and reducing the source of combustible gas generation; The zinc borate residue after removing the crystallization water can continue to participate in the construction of the carbon layer.
2. Carbon layer enhanced barrier: The decomposed boronic acid groups undergo cross-linking reactions with the combustion products of the substrate, promoting the formation of a dense and porous ceramic carbon layer. This carbon layer can effectively block the bidirectional transfer of oxygen and heat, delay the spread of flames, and adsorb smoke particles, reducing smoke density (SDR) by more than 35%.
3. Gas phase free radical capture: The boron containing gas phase components generated by thermal decomposition can efficiently capture active free radicals such as · OH and · H in the combustion chain reaction, cutting off the flame propagation path. Especially for magnesium hydroxide/aluminum flame retardant systems, it has a significant synergistic effect, which can increase the material's oxygen index by 3-5 units and easily achieve UL94 V-0 flame retardant grade.
1. High crystalline water activity, outstanding synergistic efficiency
-The crystal water content is stable at 10.5% -11.5%, and the heat absorption efficiency of graded dehydration is 15% higher than that of zinc borate pentahydrate. It can quickly control the temperature and suppress flame spread in the early stage of combustion;
-When compounded with magnesium hydroxide for PP pipes, the total amount of inorganic flame retardants added can be reduced by 15% -20%, while maintaining UL94 V-0 grade and reducing raw material procurement costs;
-The recommended addition amount is only 6% -10% (based on the total mass of the material), which is suitable for the compounding needs of the vast majority of high-end flame retardant systems.
2. Zero halogen environmental protection
-100% halogen-free, antimony free, and heavy metal free. No toxic or corrosive gases such as hydrogen halides or cyanides are released during combustion
-Meet the requirements of special standards such as GB 8624-2022 B1 level for building materials and UL 1581 for cable industry, and can be used in high-rise building cables, indoor decoration materials and other fields with strict environmental and safety requirements;
-The combustion residue is a stable zinc borate salt, which has no secondary pollution and can be recycled and reused, meeting the circular economy requirements of the EU WEEE directive.
3. Excellent compatibility ensures the mechanical properties of the substrate
-After mild surface activation, it has excellent compatibility with various polymer materials such as PE, PP, PVC, EVA, natural rubber, synthetic rubber, etc., and is evenly dispersed without agglomeration, without the need for additional dispersants;
-The core mechanical properties such as tensile strength, impact toughness, and elongation at break of the material are not significantly reduced, and the mechanical performance retention rate of PP products is over 90%, meeting the needs of high-end products;
-Suitable for various processing techniques such as extrusion, injection molding, rolling, and coating, without the need to modify existing production equipment. The processing temperature window is wide (170-260 ℃), and the performance is stable without fluctuations.
4. Stable and durable storage to meet global supply chain demands
-The chemical properties of the product are stable, with a moisture absorption rate of ≤ 0.5%. It can be stored in a dry environment at room temperature for up to 3 years and does not require special moisture-proof packaging during transportation, reducing storage and logistics costs;
-Good weather resistance, stable performance within a wide temperature range of -30 ℃~150 ℃, suitable for products in outdoor, high and low temperature environments, without precipitation or migration;
-Supports various packaging forms such as 25kg/paper plastic composite bags, 500kg/ton bags, and bulk bags, with a minimum order quantity as low as 25kg, to meet the procurement needs of enterprises of different sizes.
1. The cornerstone of the "green transformation" of PVC and halogen containing systems
·Function: The preferred benchmark synergist that can replace or significantly reduce the amount of antimony trioxide (Sb₂O₃) used.
·Benchmark: Adding 8-12 phr to soft PVC cable material can reduce smoke density (Ds max) by more than 50% while replacing 50-70% antimony dosage, and significantly improve anti droplet performance. Any new environmentally friendly alternative should be benchmarked for performance and cost based on this benchmark.
2. Efficiency amplifier for halogen-free flame retardant system
·Function: The core of performance and cost optimization for the aluminum hydroxide (ATH)/magnesium hydroxide (MDH) system.
·Benchmark: Adding 3-6 phr (10-15% of ATH usage) to EVA/PE halogen-free cable material can reduce ATH filling by 5-15% while maintaining the same UL94 V-0 grade. At the same time, the oxygen index of the system can be increased by 2-3 points, and the processing flowability can be improved by about 15-20%. This is the golden reference line for evaluating any new synergist.
3. A "multifunctional balancer" for rubber, paint, and general plastics
·Function: It provides a universal multifunctional additive that is flame retardant, smoke suppressant, promotes carbonization, and provides moderate reinforcement.
·Value proposition: Its extensive application literature and publicly available data make it the initial choice with the lowest risk and strongest data comparability when developing new formulas.
Q1: What is the difference between zinc borate 3.5H₂O and zinc borate pentahydrate?
A1: Zinc borate pentahydrate crystal water is prone to loss, with a decomposition temperature of about 270 ℃ and limited processing adaptability; Zinc borate 3.5H₂O crystal water is stable, the decomposition temperature is raised to 285 ℃, the heat absorption efficiency is higher, and the synergistic performance and processing adaptability are better.
Q2: Why insist on using classic formulas in the face of endless "enhanced" and "specialized" products?
A2: This concerns the philosophy of "necessary performance" and "certainty". Specialized "products are optimized for specific extreme working conditions, but may compromise on other dimensions and introduce new variables. The certainty of Zinc Borate 3.5H₂O lies in the fact that its entire performance boundary has been fully mapped by decades of experience in the global industry. For 90% of general applications that do not reach performance limits, using it can achieve 'zero unexpected risk'. Top engineering wisdom lies in accurately matching requirements and resources, without paying additional costs for redundant "possibilities".
Q3: What is the environmental compliance of this product in major global markets?
A3: Zinc Borate 3.5H₂O fully complies with mainstream global environmental directives. Its formula does not contain any restricted substances such as halogens, bromine, antimony, etc., and its heavy metal content is much lower than the limits of EU RoHS, REACH, US TSCA, and relevant Chinese regulations. We provide a full range of compliance support documents (SDS, CoC, REACH registration number, etc.) to ensure worry free global market access for your products.
If you are looking for zinc borate 3.5H₂O, zinc borate 3.5H₂O hydrate, and highly active zinc borate, Taixing will be your best partner and we will offer the most favorable price for cooperation. Welcome to negotiate!
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