In your sample plan, is there any other solvents used in the process other than the IPA listed and is there a mold release substance used? In addition to the REACh test for naphthalene, we will need a random population of key caps tested for Prop 65 on key caps destined for the US market. Naphthalene is a wipe test performed and analyzed to determine if the residue on the surface exceeds Prop 65 Safe Harbor Levels, (No Significant Risk Level) of 5.8 µg/day. The Intertek lab should know the testing protocol, Intertek’s process can be found here.