Section 523.303 - Contract clauses(a) Insert the clause at 552.223-70, Hazardous Substances, in solicitations and contracts for packaged items subject to the Federal Hazardous Substances Act and the Hazardous Materials Transportation Act.(b) Insert the clause at 552.223-71, Nonconforming Hazardous Materials, in solicitations and contracts for supplies that contain hazardous materials.(c) Insert the clause at 552.223-73, Preservation, Packaging, Packing, Marking and Labeling of Hazardous Materials (HAZMAT) for Shipments, in solicitations and contracts for packaged items containing hazardous materials.64 FR 37220, July 9, 1999, as amended at 80 FR 36248 , June 24, 2015; 86 FR 55520 , Oct. 6, 2021