Sellers of oil and chemicals. And raw materials to make sure chemical contamination. At least one time per year and result in the purchasing department to check every time.
The type of oil and chemicals and other raw materials will be required to perform monitoring of chemical contamination. At least once a year and, as a result of the review, the Purchasing Department know.
The type of oil and chemical products and raw materials will need to be made at least once a year review chemical contamination 1. And, as a result, the department has purchased.