Akcrostab™ T-5319 is an economical liquid organotin mercaptide having good light and weathering properties, designed for rigid profile and sheet extrusion, especially for more complex foam profiles and rigid profile extrusions. Akcrostab™ T-5319 exhibits good weathering characteristics making it suitable for use in PVC siding topcoat, window profiles and fencing applications. T-5319 is moderately lubricating and exhibits excellent color hold and long term stability. It also finds utility in molding applications and highly filled or interior profile applications. Usage levels from 1.0-1.4 phr are suggested.