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SI Group Announces Ultranox™ 626 U.S. FDA Approval Extension

Phosphite Antioxidant Now Has Broader Approval for Food-Contact Applications

SCHENECTADY, NY – July 11, 2019 – SI Group, a leading global developer and manufacturer of performance additives, process solutions, pharmaceuticals and chemical intermediates, is pleased to announce that its phosphite antioxidant ULTRANOX™ 626 has been granted an extension of existing approvals by the U.S. Food & Drug Administration (FDA) for use as a food contact substance in polypropylene homopolymers and copolymers under Conditions of Use A through H as listed in FCN 1988.

ULTRANOX™ 626 is a high-performance organophosphite antioxidant designed for demanding applications in homopolymers and copolymers of propylene and ethylene, as well as for elastomers and engineering compounds, particularly for applications where excellent color stability is required. The recent extension permits the use of ULTRANOX™ 626 in a wide range of polypropylene food packaging and other food-contact applications. 

“We will continue to invest in the future of polymer additives that meet growing safety requirements,” said Rich Preziotti, SVP and President, Additives. ULTRANOX™ 626 has the highest phosphorous concentration among our secondary antioxidants; therefore, it can be used at lower concentrations, resulting in low migration and low volatile-content plastics. These features align with the current requirements of responsible food packaging producers and brand owners.

This approval is effective as of June 25, 2019 and is specific to the material manufactured at SI Group’s Morgantown, WV facility. 

Company Contacts:

Product Marketing Information: Martin Pavlik,

Regulatory Information: David Brassington,

About SI Group

SI Group is a leading global developer and manufacturer of performance additives, process solutions, pharmaceuticals and chemical intermediates, with strong market positions in the plastics, oilfield, rubber, fuels & lubricants, active pharmaceutical ingredients and industrial resins industries. SI Group solutions are critical to the quality and performance of countless industrial and consumer goods. Headquartered in Schenectady, New York, SI Group operates more than 30 manufacturing facilities on five continents with approximately $2 billion in annual sales, and more than 3,000 employees worldwide. SI Group is a portfolio company of SK Capital Partners. In 2018, SI Group received its third silver award for corporate social responsibility by EcoVadis and is ranked among the top seven percent of more than 45,000 worldwide companies. SI Group is The Substance Inside. For more information, visit

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