The European Chemicals Agency (ECHA) has issued a call for evidence on documents that the United Kingdom’s Competent Authority (CA) has submitted regarding concerns over the purported persistent, bioaccumulative, toxic (PBT) or very persistent, very bioaccumulative (vPvB) properties of D4 and D5. The submission deadline is November 29, 2014. According to ECHA, this is the first time that its executive director has asked the member state committee (MS C) to give an opinion on PBT and vPvB properties under REA CH Article 77(3), but the procedure will ensure consistency between the MS C and risk assessment committee (RA C) deliberations. The RA C will apparently be asked to consider a UK-CA restriction proposal for octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5).

These substances have not been identified through the REA CH Article 59 process, although some studies have apparently shown that they resist degradation and accumulate in the environment, particularly in the bodies of animals. D4 and D5 are used in cosmetics and personal care products such as sunblock, deodorant, hair spray, hair conditioner, lipstick, and lotion. The United Kingdom will reportedly submit restriction proposals in January 2015 to limit concentrations to 0.1 percent by weight of D4 and D5 in personal care products that are typically washed off when used. See, October 23, 2014.