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[Descrição sumária]1.Paper Weight Unit: Grammage Grammage refers to the weight of paper per square meter. In terms of reams: 1 ream = 500 sheets. In terms of tons: 1 ton = 1000 kilograms.   2.Most Common Paper Sizes: Standard Size: 787*1092 millimeters Large Size: 889*1194 millimeters     3.Weight Ranges and Primary Uses of Different Types of Paper:   Copy Paper: 14-17 gsm Specifications: Used for VAT invoices, gift packaging, typically in pure white.   Typing Paper: 28 gsm Specifications: Used for forms and documents, available in seven colors: white, red, yellow, blue, green, light green, and purple.   Offset Paper: 35—40 gsm Specifications: Smooth on one side, suitable for forms, memos, and low-grade printing.   Writing Paper: 50 — 100 gsm Specifications: Used for low-grade printing, primarily domestically produced.   Art Paper: 60—180 gsm Specifications: Commonly used domestically, also available in joint ventures and imports.   Newsprint: 55—60 gsm Specifications: Used for newsprint, typically in roll or sheet form.   Carbonless Paper: 40—150 gsm Specifications: Carbonless with direct copy capability, available in different colors for multipart forms.   Coated Paper: A. Double Coated: 80-400 gsm Specifications: High-end printing. B. Single Coated: Used for packaging, boxes, bags, and high-grade printing.   Art Card: 105—400 gsm Specifications: High-grade color printing.   Grey Back White Board: 200 gsm and above Specifications: Used for packaging.   White Card: 200 gsm Specifications: Double-sided white, used for medium-grade packaging.   Kraft Paper: 60—200 gsm Specifications: Used for packaging, boxes, envelopes, and folders.   Specialty Paper: Used for covers, decorations, crafts, and high-quality printing.   Grey Board: 250-1800 gsm Specifications: Can be used for rolls (250-650 gsm) or sheets (650 gsm and above), commonly used for folders, leather goods, bags, notebook covers, and photo frame backs.   Black Card: 80-800 gsm Specifications: Used for boxes, tags, DIY albums, and photo albums.   White Board: 230-450 gsm Specifications: Commonly used for printing color boxes.