A4U – Raw Paper Sizes

240 × 330mm | 9.4 × 13in

The RA and SRA paper formats are defined by ISO 217 “Paper – Untrimmed Sizes” and cover untrimmed raw paper for commercial printing. The RA and SRA sizes are slightly larger than the corresponding A series sizes to allow for bleed on printed material that will be later trimmed to size, often for bound publication.

RA stands for “raw format A” and is conceptually defined as being 105% of the A series size, thus as A0 has an area of 1 square meter RA0 has an area of 1.05 square meters. SRA stands for “supplementary raw format A” and is conceptually defined as being 115% of the A series size, so a sheet of SRA0 paper has an area of 1.15 square meters. In reality the sizes for RA0, RA1, RA2, SRA0, SRA1 and SRA2 are rounded to the nearest centimeter and sizes for RA3, RA4, SRA3 and SRA4 are rounded to the nearest half centimeter.

Some sizes that are becoming more popular due to their extra width being good for newer printing machines are SRA1+, SRA2+ SRA3+ and SRA3++. These SRA plus sizes give a little extra width for a printer to grab the edge of the paper to turn it over for double-sided printing, as the printer will slightly mark the paper when it picks it up. It should be noted that these sizes are not defined by an ISO standard and have emerged from industry needs.

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