SI Group Announces WESTON™ 705 and WESTON™ 705T U.S. FDA Approval Extension

Highly-Effective Antioxidant Solutions for Food-Contact Applications

SCHENECTADY, N.Y., March 21, 2019 – SI Group, a leading global developer and manufacturer of performance additives, process solutions, pharmaceuticals and chemical intermediates, announced today that WESTON™ 705 and WESTON™ 705T, next-generation liquid phosphite antioxidants, have been granted an extension of existing approvals by the U.S. Food & Drug Administration for use as food-contact substances in styrene block polymers and repeat-use elastomers under conditions of use A through H with concentration up to 0.5% by weight (FCN 1927), effective March 15, 2019.

This approval confirms the toxicologically-clean composition of WESTON™ 705, and permits the novel antioxidant to be widely applied in the growing elastomers industry. The innovative chemistry of WESTON™ 705 provides effective protection of color and mechanical properties of polymers during the manufacturing, storage, and conversion processes, including their use in food-contact applications.

WESTON™ 705 and WESTON™ 705T is currently approved for use in food-contact packaging in more than 180 countries, including the United States, Canada, Europe and China. For more information, visit the WESTON™ 705 product website, or

Company Contacts:

Product Marketing Information: Martin Pavlik,

Regulatory Information: David Brassington,


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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