Standard Grade Zinc Borate

Standard grade zinc borate (typical chemical formula 2ZnO·3B₂O₃·3.5H₂O) is a universal halogen-free flame retardant enhancer produced based on atmospheric crystallization process, focusing on solving the three major pain points of "high flame retardant cost, high compliance threshold, and difficult process adaptation" for small and medium-sized manufacturing enterprises. The product has stable purity and balanced performance, and can be compounded with mainstream systems such as magnesium hydroxide, aluminum hydroxide, and phosphorus nitrogen flame retardants. Its value lies in providing a common benchmark for global formula engineers with highly consistent chemical composition, physical indicators, and reaction behavior.

Core strengths

1. Exquisite and balanced thermal management

Its crystal water (~13.5%) begins to release at around 300 ° C, which is not accidental. This temperature point is precisely located at the beginning stage of the thermal decomposition of many common polymers (such as PVC and polyolefins) and after the ATH/MDH dehydration peak, playing a "connecting the past and the future" thermal buffering role. It not only avoids the interference of decomposition at common processing temperatures (usually<250 ° C), but also provides timely endothermic protection and gas-phase dilution when the material begins to pyrolyze.

2. The dual high-efficiency effect of condensed phase and gas phase

·Condensed phase: The B₂O₃ produced by decomposition melts at 500-600 ° C, forming a strong glassy barrier on the surface of the carbon layer, effectively isolating oxygen and heat. Meanwhile, zinc compounds can catalyze the crosslinking of polymers into carbon, improving the quality and strength of the carbon layer.

·Gas phase: The released boric acid species can effectively capture H · and OH · radicals in the combustion chain, interrupting the chain reaction. When used in combination with halogenated products, it can generate more efficient gas-phase flame retardants with hydrogen halides.

3. Excellent smoke suppression and anti drip properties

By promoting the formation of a dense carbon layer and catalyzing the gas-phase oxidation of smoke particles, the smoke density during material combustion can be significantly reduced. At the same time, it can improve the viscoelasticity of polymer melt at high temperatures and effectively suppress the generation of combustion droplets.

Application scenarios

1. PVC and chlorinated polymers: cost-effective pillars for flame retardancy and smoke suppression

·Function: Efficiently replacing or partially replacing antimony trioxide (Sb₂O₃) is the core of environmental protection and low cost. Reacts with HCl produced by PVC decomposition to generate gas-phase flame retardants, while strongly promoting carbonization and smoke suppression.

·Typical addition: Adding 5-15 phr to soft PVC cable materials and flooring can significantly increase oxygen index and reduce smoke density (Ds max) by more than 50%.

·Collaboration: Excellent compatibility with calcium zinc stabilizer system, co plastic stabilization effect.

2. Halogen free flame retardant polyolefin and elastomer: the "efficiency multiplier" of ATH/MDH system

·Function: Compound with aluminum hydroxide/magnesium hydroxide to produce a synergistic effect of "1+1>2". It can not only enhance the ultimate oxygen index of the system, but also significantly improve the mechanical performance degradation, poor processing flowability, and high smoke problems caused by high filling.

·Typical addition: Adding 3-8 phr (10-20% of ATH dosage) to EVA/PE halogen-free cable material can improve tensile strength and extrusion speed while maintaining the same flame retardant level, and reduce smoke density.

3. Rubber, coatings, and sealants: versatile functional additives

·Function: Provides flame retardancy and smoke suppression in rubber without affecting the vulcanization process; In expandable fireproof coatings, it serves as a multifunctional component for acid source, carbon source, and gas source; Provide fire resistance in the sealant.

Frequently Asked Questions

Why should we still choose standard grade in a market full of various "specialized" and "high-performance" products?

A1: Standard level refers to "universal currency", while specialized products refer to "special tools". The advantage of standard level lies in its reliability that has undergone extreme verification, unparalleled cost-effectiveness, and extensive technical support data. For over 80% of general flame retardant requirements (such as ordinary wires and cables, building materials, and general injection molded parts), it is the most cost-effective choice. Specialized products exist to address specific extreme pain points (such as extremely high temperature processing, extreme transparency requirements, etc.), but often come with rising costs. Optimizing from the standard level is the lowest risk and most cost-effective technological path.

Q2: What is the difference between standard grade zinc borate and modified high-end zinc borate?

A2: Standard grade zinc borate focuses on cost-effectiveness and universal adaptability, and can meet conventional material requirements without modification; Modified high-end zinc borate has undergone surface treatment, resulting in higher dispersibility and synergistic efficiency, making it suitable for high-end products with strict requirements for mechanical properties and flame retardant levels.

Q3: What are the storage and safety precautions for the product?

A3: Stable chemical properties. It is recommended to store in a cool, dry indoor environment to avoid moisture and pollution. Conventional industrial hygiene protection is sufficient, such as dust masks and goggles. The Product Safety Data Sheet (SDS) provides all safety operation, storage, and emergency handling information.

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