Formaldehyde resin 13 April 2023 A type of resin used in some nail products that contains formaldehyde, which can cause skin irritation and allergic reactions in some people. Related Articles: Understanding Formaldehyde Levels in Nail SalonsThe Real Dangers of Acrylic Nails7 free! 10 free! 99 free! What is the ‘deal’ here?Glossary: Tosylamide Formaldehyde Resin (TSFR)The 3-Free Myth