The employer shall ensure that the employees have easy access to the substance index with information about the chemicals that they use in their work or otherwise come into contact with. Relevant safety data and product information sheets shall also be available at each work site.In addition, the employees shall have satisfactory access to any electronic substance indexes.The safety representative shall have access to the applicable substance index for his/her own safety area. The senior safety representative shall have access to the complete substance index for the undertaking.