The Pipeline and Hazardous Materials Safety Administration (PHMSA) hereby reminds offerors of bulk shipments of peroxyacetic acid (listed under § 173.225(h)) to seek a required prior approval from the Associate Administrator under § 173.128(d). Applications for approval must be submitted in accordance with the provisions of § 107.705. The testing and classification scheme is found in the UN Manual of Tests and Criteria Figure 20.1, which describes the required test results. Specifically, the results of Test E (UN Manual of Tests and Criteria, Section 25), Test F (UN Manual of Tests and Criteria, Section 26), and Test H (UN Manual of Tests and Criteria, Section 28) are required to approve formulations of peroxyacetic acid for bulk shipment. See Safety Advisory for full details.