This Act amends several provisions of the Labour Code, concerning in particular the definition of hazardous substances (Part II, s. 3) and the obligations they imply for employers (Part II, s. 5). It also amends the Hazardous Products Act, especially regarding methods of manufacturing and preparing such products (containing an amended appendix listing the categories of products in Part I). The amendment promulgates (in Part III) the Hazardous Materials Information Review Act, which establishes a system of review and appeals of decisions taken by screening officers. The new Act sets up the Hazardous Materials Information Review Commission (Part III, ss. 28 et seq.), which includes two workers' representatives.