Zinc hydroxystannate

ZINC HYDROXYSTANNATE (ZHS)

SPECIFICATION OF ZINC HYDROXYSTANNATE (ZHS)
Chemical formula ZnSn(OH6)
Appearance White powder
Analysis (approx.) Sn
Zn
CI
Free H2O 41%
23%
< 0.1%
< 1%
Specific gravity 3.3
Bulk density (g/cm3) Tamped
Untamped
0.6
0.5
Median particle size (g/cm3) (µM) 2.3
Aqueous solubility (@ 20°C) <0.01%
Refractive index (@20°C) 1.9
Decomposition temperature (°C) > 180

Applications
Zinc Hydroxystannate (ZHS) can replace Molybdenum Trioxide in PVC FRLS cable compound. ZHS was developed initially for use on halogen containing polymer formulation, especially flexible PVC for wires and cables. The results obtained were so impressive that its application in Flame Retardant Low Smoke ( FRLS ) & Halogen-Free Flame Retardant ( HFFR ) has also been developed. Zinc Hydroxystannate (ZHS) gives you Oxygen Index as well as Smoke Suppressant properties. By adding Antimony Trioxide you get oxygen index but smoke increases, but by adding ZHS you get oxygen index as well as smoke suppressant properties.

Properties
The excellent flame retardant and smoke suppression properties of ZHS have been demonstrated for the following materials:-

* PVC ( Rigid and Flexible), FRLS CABLE compound
* Polyester Resins
* Alkyd Resin-Based Paints
* Polychloroprene ( Neoprene)
* Chlorosulphoned Polyethylene ( Hypalon )
* Polyamide ( Nylon 6 and Nylon 66 )
* Epoxy Resins and Ethylene-Vinyl Acetate Co-Polymer
* EVA, HFFR cable compound