Broadly speaking. Gloss in UPVC is related to formulation and processing.

Formulation - Better gloss by; enhanced fusion, balanced processing aids, lubricant package adjustment to speed fusion and create a good release from process equipment, no large particle sized minerals.

Process - Better gloss by; adequate fusion (poor fusion = poor gloss), temperature control (higher temps - better gloss), adequate shear and mixing in the conversion from powder to melt, good release from clean rolls or calendar, and adequate calendar temperature to encourage chrome emboss and release. 

I do know what contributes to good gloss in PVC.

First - adequate fusion
Second - compatible ingredients
Third - high processing heats
Fourth - balanced lubricant system
Fifth - no large particle size fillers

Good fusion, compatible ingredients, balanced lubs can be enhanced by formulation. Process aids and external lubs can aid gloss, but if you over do it... gloss suffers. Eliminate any ingredient that is incompatible w/ PVC. The majic stuff may simply be a fusion aid and alub package.

Adequate processing (heat and shear) and clean die surfaces will go a long way toward good gloss. Do'nt over process!

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