Seven new standard grades of new liquid light stabilizers are now available for use in injection molding, blow molding, and extrusion from Riverdale Global, Aston, Penn. Depending on the grade, +Shield UV stabilizers are recommended for use with polyolefins, styrenics, PET, TPEs, and engineering thermoplastics. Four of the grades are FDA-approved, and two of these can also be used as UV absorbers in packaging applications.
These liquid stabilizers reportedly provide economic and product-quality advantages over pellet masterbatch as a result of the lower and more precise dosing made possible by their liquid form and their improved rate of dispersion in the polymer. Available for use with +Shield UV stabilizers is the Riverdale Gravimetric Stand (RGS), in which a self-contained drum is mounted on a self-calibrating lows-in-weight scale that continually reports the results of the contents to the controller as a means of ensuring that the target let-down ratio is maintained.