Zinc borate

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Zinc borate
Identifiers
UNII
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Zinc borate is an inorganic compound, a borate of zinc. It is a white crystalline or amorphous powder insoluble in water. Its toxicity is low. Its melting point is 980 °C.

Variants

Several variants of zinc borate exist, differing by the zinc/boron ratio and the water content:[1]

  • Zinc borate Firebrake ZB (2ZnO·3 B2O3·3.5H2O),
    CAS number
    138265-88-0
  • Zinc borate Firebrake 500 (2ZnO·3 B2O3), CAS number 12767-90-7
  • Zinc borate Firebrake 415 (4ZnO·B2O3·H2O), CAS number 149749-62-2
  • ZB-467 (4ZnO·6B2O3·7H2O), CAS number 1332-07-6
  • ZB-223 (2ZnO·2B2O3·3H2O), CAS number 1332-07-6

The hydrated variants lose water between 290–415 °C.

Uses

Zinc borate is primarily used as a

arcing and tracking
.

In halogen-containing systems, zinc borate is used together with

alumina trihydrate
. It catalyzes formation of char and creates a protective layer of glass. Zinc catalyzes the release of halogens by forming zinc halides and zinc oxyhalides.

In halogen-free system, zinc borate can be used together with alumina trihydrate,

silica, borosilicate glass can be formed at plastic burning temperatures.[3]

Zinc borate is used in

rubbers, etc. It is also used in some intumescent systems.[4]

Zinc borate has synergistic effect with zinc phosphate or barium borate as a corrosion inhibitor pigment.

Zinc borate acts as a broad-spectrum fungicide in plastics and wood products.[5]

Zinc borate can be used as a

electrical insulators
it improves the ceramics properties.

lubricating oils.[6]

References

  1. Cefic. January 2006. Archived from the original
    (PDF) on 9 August 2011. Retrieved 6 February 2010.
  2. ^ "Zinc Borate (Boric Acid, Zinc Salt)". Chemical Land21. Retrieved 6 February 2010.
  3. ^ "Firebrake zinc borates for plastics". Luzenac Group. Retrieved 6 February 2010.
  4. ^ Bellingham, F. (25 November 1992). "Zinc borate in intumescent paints". European Polymers Paint Colour Journal. Retrieved 6 February 2010.
  5. ^ "zinc borate (Firebreak ZB) EPA Pesticide Fact Sheet 10/91". Pesticide Management Education Program. 1 October 1991. Retrieved 6 February 2010.
  6. ^ "Nano-zinc borate". Shandong Xinruida Chemical Co., Ltd. Retrieved 6 February 2010.

External links

  • Zinc borate in the Pesticide Properties DataBase (PPDB)
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