Flame Retardants

FLAMTARD

Antimony-Free Flame Retardants

William Blythe is a global leader in the manufacture of antimony-free, flame retardant synergists for polymers under our brand: Flamtard™.

Based on zinc, tin and mixed metal oxide technology (eg. zinc hydroxystannate and zinc stannate) the Flamtard™ products are synergists that offer flame retardant and smoke suppressant properties in a range of polymer systems, including PVC, polyamides, elastomers and thermosets. The Flamtard products are commonly used to replace ATO (antimony trioxide) in polymer applications such as wire and cables, roofing membranes and artificial leather.

All Flamtard™ products are non-hazardous, environmentally benign and registered globally.

Flamtard™ product benefits:

Flame retardant synergist and smoke suppressant
Non-hazardous technology
Cost-effective replacement for antimony-based flame retardant additives (eg. ATO)

1. Dual Phase

The Flamtard™ range has dual phase activity: inhibiting flame by the gas phase mechanism and suppressing smoke by a condensed phase mechanism.
2. Combustion

During the early stages of combustion, tin is released into the gas phase where it can combine with halogen radicals released from the decomposition of PVC or halogen-containing additives, inhibiting flame formation.
3. Condensed Phase

The zinc component acts in the condensed phase, catalysing the conversion of the decomposing polymer into a carbonaceous char rather than into smoke.
4. Gas Phase

The gas phase activity is analogous to the way in which antimony trioxide functions and can therefore be used as a direct replacement in some formulations that require antimony-free products.

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Flamtard™ products are stable and compatible with most polymer systems with no adverse effect on polymer performance properties. Our commitment to manufacturing excellence and continuous improvement ensures that all Flamtard^TM products have a high purity and a tightly controlled particle size, delivering consistently superior performance.

Flamtard H

Based up on zinc hydroxystannate (ZHS) technology, Flamtard H is a flame retardant and smoke suppression synergist that is stable up to 220 °C and ideally suited for PVC applications. Commonly used as an ATO (Antimony Trioxide) replacement.

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Flamtard S

Based upon zinc stannate (ZS) technology, Flamtard S is a flame retardant and smoke suppressant synergist for polymers that is stable above 400 °C. Ideally suited for polyolefins and engineering thermoplastics. It is commonly used as part of a ATO replacement solution in polymer systems.

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Flamtard X

Flame retardant and smoke suppressant synergist optimised for low cost and performance in PVC polymers.

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Applications

Product Development & Formulation Support

We have a team of experienced polymer scientists and polymer processing lab facilities on hand ready to support customers in formulation development. We have the capability to compound, extrude, injection mould and characterise both the physical properties and flame retardant properties of a range of polymer materials.