Diisononyl phthalate (DINP) has been on the Prop 65 list of chemicals since December 2013, as a chemical known to cause cancer. Sources of this chemical may include products containing plastics/polymers such as adhesives, automobile interiors, cables, inks, footwear, gloves, lacquers, paints, pigments, PVC flooring materials, tubing and sealants 

In December 2016, the California Environmental Protection Agency’s Office of Environmental Health Hazard Assessment (OEHHA) issued a Safe Use Determination (SUD) for professional flooring installer exposures to DINP from vinyl flooring products containing no more than 8.7% DINP by the Resilient Floor Covering Institute member companies. These vinyl flooring products are available as sheets or tiles that are used in residential (e.g. homes and apartments), commercial (e.g. offices, retail stores and hotels) and institutional (e.g. schools and hospitals) buildings and can be installed by both do-it-yourself (DIY) consumers as well as flooring professionals.

In the last few years, enforcement actions against businesses that fail to warn consumers about exposure to DINP have resulted in settlement agreements involving a wide range of products. These include, inter alia, brush sets, cell phone wallets, desk pads, electronic accessories, photo albums, rubber gloves and shoe flats (SafeGuardS 111/18 and 38/20)

Since the publication of Safeguard 38/20, several Prop 65 settlements for DINP-containing consumer goods have been reached and are summarized in Table 1. It is interesting to note that many of these allow a Prop 65 warning as an alternative to reformulation.

California Proposition 65 (Prop 65) is the ‘Safe Drinking Water and Toxic Enforcement Act of 1986’, a ballot initiative passed overwhelmingly by Californian residents in November 1986. It requires the state to publish a list of chemicals that are known to cause cancer, birth defects and/or reproductive harm. First published in 1987, the list has evolved to approximately 900 chemicals.

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