Antimony trioxide replace or substitue

Antimony trioxide(ATO) price is now headache for all user.
FOB China price is about 15000USD/MT.

When ATO is used as a flame retardant in plastic, the loading amount is not really big.
But, even though small amound, the users have high burden.

ATO has no bright future since it is considered as toxic chemical, but still important and large consumption.

I found there is antimony trioxide replacement, which can partially replace ATO in PVC and other plastics up to 50%.
You can check FR ADD 50 at alibaba.com

Weakpoint: off white
Strong point: Cost Save a lot, lower SG(Specific Gravity).

Thanks.

Sean.