Catalyst of the Week

Antimony (Sb)
No. 51 on the Periodic Table.

More than 90% of all polyester worldwide is currently produced using an antimony. Other than antimony, titanium and germanium catalysts are used in some specific fields. Each exhibits its own catalytic activity and has both advantages and disadvantages. Although much research has aimed at modifying these catalysts, a solution that thoroughly satisfies market needs has yet to be found. Antimony catalysts lead to the problematic formation of insoluble particles and the gray discoloration in polyester, encouraging businesses to try non-antimony catalysts, a trend of recent.

Hmm...does that mean that if I buy a purple polyester fleece sweater, it will turn gray eventually?