In a November 21, 2012, Canada Gazette notice, Canada amended the Domestic Substances List (DSL). The amendments include the addition of cellulose, hydrogen sulphate, sodium salt, obtained from sulphuric acid hydrolysis of the bleached pulp, with the substance having the following characteristics:
- (a) Nominal length of 100 ± 50 nanometres;
- (b) Cross section dimension less than or equal to 10 nanometres; and
- (c) Sulphur content of greater than or equal to 0.5 percent and less than or equal to 1.0 percent by weight.
Canada added the substance with substance identity number 91343, rather than a Chemical Abstracts Service (CAS) Registry Number. Substances on the DSL do not require notification unless they are proposed for a significant new activity (SNAc) as indicated on the DSL. Substances not appearing on the DSL are considered to be new to Canada and are subject to notification.