D1

The D1 paper size from China's unique D series has dimensions of 532 mm x 760 mm. With a surface area of 0.40 square meters, it serves as an intermediate size between the oversized D0 and smaller formats. Originating in pre-1949 Republic of China administrations, D1 caters to specific Chinese industrial requirements.

Its 20 23⁄24 inch width by 29 11⁄12 inch length caters well to large spreadsheets, financial statements, project schedules, and more that demand substantial width for columns. The versatility of the size also suits wide technical drawings, large tables and figures, extensive multi-page reports bound on the long edge, and similar applications. However, its reduced area from D0 improves handling and storage.

Overall, the D1 paper dimensions offer standardized specifications for an in-between niche not fully served by ISO sizes. It provides a balance of sizable width combined with area a fraction of the capacious D0 format. The unique D series and transitional D1 size once again highlight adaption of Chinese paper standards for specialized local needs even in the intermediate size ranges.