Metal processing sheet and metal processing sheet

摘要

PROBLEM TO BE SOLVED: To provide a metal processing sheet capable of producing a metal processing sheet excellent in storage stability and cosmeticity without causing deterioration of the metal layer with time. SOLUTION: The metal processing sheet of the present invention can be used as the base sheet when manufacturing a metal processing sheet in which a metal layer made of aluminum is provided on the surface of the base sheet. The sheet for metal processing of the present invention contains a fiber sheet, a black pigment, and a specific anion. The specific anion is one or more selected from the group consisting of nitrate ion, acetate ion, sulfate ion, phosphate ion, monohydrogen phosphate ion and dihydrogen phosphate ion. The specific anion measured according to the ion chromatograph method JIS K-0127: 2013, which elutes when the metal processing sheet having an absolute dry weight of 5 g is immersed in distilled water at a liquid temperature of 20 ° C. for 24 hours. The total concentration of the metal processing sheet is 1600 ppm or more with respect to the absolute dry weight of the metal processing sheet. [Selection diagram] None