Altstoff (Engl. Existing chemical substance) is a term from the chemicals legislation .
Existing substances are substances that were already on the market before the respective national chemicals act came into force . These are legally regulated differently (usually less strictly) than those that came onto the market after the law came into force.
In the European Union , existing substances were understood to be substances that were already on the market within the EC before September 18, 1981 . All of these substances are listed in the European Inventory of Existing Substances ( EINECS ).
The renewal of the European Chemicals Law [Regulation EG 1907/2006 ( REACH )], which was decided in 2006, was intended to ensure that existing substances are registered and evaluated just as strictly as new substances . According to this regulation, which came into force on June 1, 2007, existing substances are referred to as phase-in substances after their pre-registration (possible from June 1 to November 30, 2008).