the melt or cast number. The symbols shall be repeated at intervals not greater than 3 feet along the edge of the sheet. For lead sheet less than 1/2 inch thick, this information shall be furnished on the packing container (see
5.3).
3.7 Workmanship. The lead sheet shall be free from injurious pits, dents, buckles, waves, scratches, grit, foreign matter, porosity, and other defects affecting the serviceability of the material.
4. QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government. The Government reserves the right to perform
any of the inspections set forth in the specification where such inspections
are deemed necessary to assure that supplies and services conform to prescribed requirements.
4.2 Inspection lot.
4.2.1 For inspection purposes, a lot shall consist of all lead sheet of the same grade and thickness produced by one manufacturer and offered for delivery at one time for inspection, but shall not exceed 5,000 pounds.
4.2.2 A lot for grade D lead sheet shall be further limited to the sheet having the same total material reduction and head trading cycles (as necessary), from the same manufacturing or smelting heat. For this case, a lot that cannot be identified by heat shall be cause for rejection.
4.2.3 For grades C and D or when specified grade B (see 6.2), a lot for chemical analysis shall also be limited to the lead sheet produced by one manufacturing or smelting heat. For this case, a lot that cannot be identified by heat shall be cause for rejection.
4.3 Sampling for quality conformation inspection.
4.3.1 Sampling for chemical analysis. Two samples for chemical analysis shall be selected from each lot. Each sample shall be taken from a different sheet or trimmings from different sheets, and shall consist of not less than
600 grams (g.) of fine, clean clippings, drilling, millings, or sawings which shall be free from oil, iron, dirt, grit, or other foreign matter. The sample shall be separately packed, labeled, and forwarded to the laboratory for analysis. When a spectrographic analysis is to be made, the quantity and
form of the sample shall be satisfactory for use by the laboratory at which the analysis is to be performed.
4.3.2 Sampling for hardness tests. Two sample shall be selected from each lot of lead sheet for the hardness test (see 4.5.2.).
4.4. Visual and dimensional examination. All material in the lot shall be visually examined to verify compliance with the requirements of this specification regarding dimensions (see 3.4), marking (see 3.6), and
workmanship (see 3.7), and other requirements not including tests. Sufficient number of readings shall be taken over each sheet to insure that dimensional tolerances of 3.4 are maintained.
4.5 Test procedures.
4.5.1 Chemical analysSiosu.rce: Chthtpesm://iacssaislt.dalan.maill y--sDioswnslohaadeldl: 2b01e4-0m9a-2d7eT2o1:n54Zeach sample
Check the source to verify that this is the current version before use.
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