Section 820 ILCS 255/9 - Material safety data sheets(a) Each employer shall obtain a material safety data sheet for each toxic substance used, produced or stored in the workplace to which employees may be exposed.(b) If the employer, manufacturer, importer or supplier becomes aware of information which is new and significant regarding the health hazard of a toxic substance, the employer must add this information to the material safety data sheet within 3 months.(c) The employer shall maintain copies of the required material safety data sheets for each toxic substance in the workplace, and shall ensure that they are accessible to employees for at least 10 years after the substance is no longer used, produced or stored.(d) Employees, their designated representatives, their treating health care professionals, emergency service agencies, and the Director shall be given a material safety data sheet if the employer possesses one within 10 days of a written request or a written statement that the employer does not possess one within the same time period. An employer who does not possess the requested material safety data sheet shall: (1) request a material safety data sheet in writing from the seller of the toxic substance within 10 days; (2) if the seller fails to provide the employer with a material safety data sheet within 30 days, file a complaint within 10 days of such failure pursuant to Section 17a against the seller alleging that the seller has failed to provide a material safety data sheet within the time limits specified by this Act; (3) mail a copy of the written request and the filed complaint to the seller and the filed complaint to the employee who originally requested the material safety data sheet within 10 days of filing the complaint. An employer shall mail the material safety data sheet to the requesting party within 10 days following receipt by the employer from the seller of the material safety data sheet.(e) A completed federal Occupational Safety and Health Administration "Form 20 Material Safety Data Sheet" containing all of the information specified in Section 3(j) shall be presumed to be a material safety data sheet complying with all of the requirements of Section 3(j).(f) This Section shall become effective with respect to any toxic substance upon filing, unless a later effective date is specified in the rule, pursuant to Section 4(e).