Importance

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Abstract

To provide a metal plate which is elongated and has a high homogeneity in a wider range, a method for manufacturing the metal plate, a metal mask obtained from the metal plate, and a method for manufacturing the metal mask. Provided is a metal plate which is elongated and is to be used for manufacturing a metal mask, in which when a differential expansion rate En in a unit length L0 in a longitudinal direction for an arbitrary position n in a width direction of the metal plate is measured at each of an arbitrary plurality of positions in the longitudinal direction, a difference in the differential expansion rate En in a central portion in the width direction is 9.0×10⁻⁶ or less at a plurality of the positions, and the central portion is a portion that occupies 80% in the width direction of the metal plate excluding both side portions that occupy 10% in the width direction.

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First Claim