The following benefits have been observed in various formulations containing ZHS and ZS.

• Greatly improved smoke suppression

• Reduced rate of heat release and total heat release

• Improvement in LOI

• Reduction of burning drips

• Increased time to ignition

• Achievement of Ul V0 in PVC, Pa and unsaturated polyester

• Low toxicity - NO RISK PHRASES with ZHS/ZS

• Can completely replace antimony trioxide (Sb2O3) in formulations

• Lower overall FR filler-loading with ZHS/ZS incorporation achieved

• Can be effective in halogenated and halogen-free systems

Why replace antimony trioxide?

• Price volatility - expensive formulations 

• Cost saving of ~25% of ATO spend

• H&S handling issues - toxicity 

• End-users deselectingmulations

Why use ZHS to completely replace antimony trioxide?

• Tin char formation 

• Better smoke suppression

• Water of hydration released 

• No toxic

• Used in low smoke zero halogen systems 

• Translucent formulation = Pigment savings

In some PVC systems, as much as 7.5% antimony trioxide may be used to give a specified level of fire performance. Just 2.5% of ZHS could be used to replace this and achieve the same level of fire performance, a lot of cost saving on annual antimony trioxide would result, with the technical benefits described above.

For more technical questions, please contact us.