WHAT IS ZINC BORATE?
Zinc Borate is an inorganic compound containing zinc, boron and oxygen, usually existing as a fine white powder. In the fireproofing industry, the most commonly used form is 2ZnO·3B₂O₃·3.5H₂O or variants with different water of crystallization content.
Unlike many traditional halogen flame retardants, Zinc Borate does not contain chlorine or bromine, therefore does not produce large amounts of toxic and corrosive gases when a fire occurs. This characteristic helps materials containing Zinc Borate better meet environmental and health safety requirements.
Zinc Borate (Zinc Borate)
FIRE-PROOFING MECHANISM OF ZINC BORATE
Fireproof effectiveness of Zinc Borate does not come from a single mechanism but is a combination of many physical and chemical mechanisms that take place simultaneously when the material is exposed to high temperatures.
When the temperature rises to the decomposition threshold, Zinc Borate releases water of crystallization within the crystal structure. This process absorbs some heat from the surrounding environment, helping to reduce the surface temperature of the material and slow down the burning process.
The released steam also dilutes the flammable gases produced during the thermal decomposition of the polymer. As a result, the ability to maintain a fire is significantly reduced.
At the same time, the remainder of Zinc Borate after dehydration will participate in forming a stable borate glass film on the surface of the material. This membrane acts as a protective barrier, preventing oxygen from contacting the material below and limiting heat transfer from the fire to the inside.
ABILITY TO REDUCE THE SPEED OF FLAME SPEED
One of the most outstanding properties of Zinc Borate is its ability to reduce the speed of flame spread on the surface of the material.
In thermoplastic systems such as PVC, PE, PP or EVA, Zinc Borate helps prolong ignition time and reduce the rate of fire spread. This is especially important for applications such as electrical cables, construction materials and electronic components, where high fire resistance is required to limit damage in the event of an incident.
When combined with other flame retardant systems such as aluminum hydroxide (ATH), magnesium hydroxide (MDH) or inorganic phosphorus, Zinc Borate often creates a synergistic effect that helps improve fire retardant effectiveness without needing to increase the amount of additives too much.
ABILITY TO REDUCE SMOKE GENERATION
In addition to slowing combustion, Zinc Borate (Zinc Borate) is also famous for its ability to reduce the amount of smoke generated during the combustion of polymer materials.
Smoke is one of the main causes of casualties in fires because it reduces visibility and contains many toxic decomposition products. The addition of Zinc Borate to the material formulation can significantly reduce smoke density, especially in soft and rigid PVC systems.
This is the reason why Zinc Borate is often used in the production of fireproof electric cables, public interior materials, vehicles and projects that require high fire safety standards.
SYNERGISTIC EFFECT WITH OTHER FIRE RESISTANTS
An important advantage of Zinc Borate is its ability to act as an effective enhancer for many other fire protection systems.
In the PVC system containing antimony trioxide, Zinc Borate helps increase fire protection effectiveness while reducing the amount of smoke generated. In halogen-free systems using aluminum hydroxide or magnesium hydroxide, Zinc Borate aids in the formation of a more stable protective char layer, thereby improving the fire resistance of the material.
Thanks to this synergistic effect, manufacturers can reduce the total amount of flame retardant additives needed while still achieving the desired flame retardant standards.
ABILITY TO CREATE PROTECTIVE COAL LAYER (CHAR FORMATION)
In many polymer systems, Zinc Borate promotes the formation of a stable carbon char layer on the surface of the material when exposed to fire.
This layer of charcoal acts as a natural insulation layer, reducing heat transfer and preventing flammable gases from escaping from the base material. Thanks to this, the thermal decomposition rate of the polymer is significantly reduced.
This property is especially useful in Intumescent Flame Retardant Systems, where the ability to form a protective layer determines the fire resistance effectiveness of the entire material system.
ENVIRONMENTAL ADVANTAGES OF ZINC BORATE
Compared to many halogen-containing flame retardants, Zinc Borate is considered a more environmentally friendly solution.
Because it does not contain chlorine or bromine, materials using Zinc Borate do not produce large amounts of corrosive halogen acid gases when burned. This helps reduce the risk of damage to electronic equipment and metal structures and reduces the negative impact on human health in the event of a fire.
The trend of replacing halogen fire protection systems with non-halogen fire protection systems also contributes to the increase in demand for Zinc Borate globally.
COMMON FIRE-PROOFING APPLICATIONS OF ZINC BORATE
Thanks to its outstanding fireproof and smoke reduction effectiveness, Zinc Borate is widely used in many industrial fields such as the production of electric cables, soft and hard PVC plastic, fireproof polyolefin, technical rubber, composite materials, fireproof paint, construction materials and electrical and electronic components.
In the electric cable industry, Zinc Borate helps improve the ability to prevent fire spread and reduce smoke, meeting strict safety standards for civil and industrial projects. In the plastic and rubber industry, this additive helps improve fire resistance while still maintaining relatively good mechanical properties of the material.
Zinc Borate is one of the most important inorganic fire-retardant additives today thanks to its ability to slow down the burning process, reduce the speed of flame spread, limit smoke and promote the formation of a protective layer on the surface of the material. In particular, the ability to work synergistically with many other fire protection systems makes Zinc Borate an effective choice in modern material formulations.
With the trend of developing non-halogen and environmentally friendly fire protection solutions, Zinc Borate is forecast to continue to play an important role in the plastic, rubber, construction materials industry and applications requiring high fire safety standards in the future.
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