Flamtard H (zinc hydroxystannate) flame retardant synergist inhibits the development of flames and smoke, and is safe for human health and the environment. Flamtard H is a zinc hydroxystannate that has both a condensed phase and vapour phase action during the rapid degradation of polyvinyl chloride and polymer materials containing halogenated and antimony additives. In halogen-free flame retardant polymer materials it can act to increase the char consistency and strength.
Flamtard H (zinc hydroxystannate) is insoluble in water and releases 15w% of water starting at 220 °C. At higher temperatures (400 °C - 600 °C), zinc and tin ions can be volatilised or liberated from their structure to exert catalytic activity. Flamtard H (zinc hydroxystannate) is part of a family of n-type wide bandgap semiconductors with a high concentration of free electrons in the conduction band, thus leading to high optical transmissions in combination with electrical conductivity.
| Chemical name |
Zinc hydroxystannate |
Chemical formula |
ZnSnO3.3H2O or ZnSn(OH)6 |
| Molecular weight |
286.15 |
C.A.S. number |
12027-96-2 |
Applications
William Blythe’s Flamtard H (zinc hydroxystannate) is ideal for use in applications such as:
Coating Additives
- Smoke suppressant and flame retardant synergist for flame retardant paints.
- Transparent conductive oxide used in the manufacture of films for solar cells, touch screens, and energy efficient glass.
Polymer Additives
- Smoke suppressant and flame retardant synergist with co-flame retardants. For polymer processing at temperatures below 220°C.
- Co-additive in phosphate flame retardant containing polymer formulations to optimise char formation.
Process Chemicals
- Solid lubricant additive in friction materials.
Product forms
William Blythe’s Flamtard H (zinc hydroxystannate) is available as a powder in both standard and free-flowing grades.
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