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Zinc Borate – Extensively Used Fire Retardant and Smoke Suppressant

By Royceintl Subscribe to RSS | May 31st 2012 | Views:

Zinc borate (or Zinc Salt, Boron Zinc Oxide, Firebrake ZB or Boric Acid), a non-halogen flame retardant, accredited by Environmental Protection Agency is an inorganic and low toxicity amalgam. It is a vital additive to help achieve brilliant resistance in rubber products. It is a free-flowing white powder, which dissolves easily and swiftly. This chemical can be added to any flame retardant mechanism and it will boost test results with minimum effect on the compound properties.

Moreover, this flame retardant chemical can create a glassy singe at high temperatures that averts flame propagation. It aids in compounding fire-resistant, halogen-free rubber, which emits minimum acidic smoke. It also produces water of hydration identical to ATH. Zinc salt is a synergist with halogenated fire retardants, ATH and antimony oxide.


Extensively Used in Flexible PVC:

This flame retardant or Zinc salt is largely utilized in flexible PVC as a partial substitute for antimony oxide like wires and cables, conveyor belts, tenting materials, carpet backing, wall coverings, auto upholstery, roofing membranes and carpet backing. Opposed to antimony trioxide, this chemical has a refractive index identical to that of majority of polymer systems that allows the utilization of lower pigment loading.

Extensively Utilized as Fire Retardant in Elastomers:

Zinc salt is highly utilized as flame retardant and smoke suppressant for applications like roofing membranes, foamed insulation products, wire and cables, conveyer belting and flooring materials. Zinc salt is a flame retardant synergist of halogen sources like tetrabromobisphenol-A, chlorinated resins and decabromodiphenyl oxide. Depending on the form of halogen source being used, Zinc borate is used widely as a flame retardant in epoxies for applications, like intumescent coatings, encapsulation of electrical components and glass-reinforced laminates.

Utilized as Fire-Retardant in Electric Parts, Polyolefin Cables and Wires:

In halogen-comprising systems, Zinc salt is utilized together with antimony oxide, whereas in halogen-free systems, it is generally utilized together with red phosphorous, alumina trihydrate or magnesium hydroxide. It must be noted that the utilization of Zinc salt can improve elongation properties of polyolefins as well.

Offers Enhanced Resistance against Electrical Degradation Processes:

The combination of zinc plus borate moieties renders inimitable functionalities. In addition, the chemical compound performs as synergists along with brominated fire retardants to tailor FR characteristics and CTI. This compound can be utilized in regrinding procedures without any sort of reduction in the original CTI values as well.


The synergy with antimony oxide facilitates half as much antimony oxide to be utilized in order to achieve comparable results. It can substitute antimony oxide as a synergist in rubber and plastics to boost the activity of primary fire retardants by stepwise producing the radicals. As it is becoming increasing apparent that smoke kills as many people as actual fire can, the need for low smoke fire retardant is becoming imperative

Royceintl - About Author:
Zinc borate/Zinc salt is a strong anti-bacterial and anti-fungal additive. 2% of it in a compound can render a distinct decrease in mold growth. For more details please logon to

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