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Chinese Series



The RD5 paper size, a unique and less commonly known dimension, holds its own significance in the realm of standardized paper sizes. As part of the ISO 216 standard, it is meticulously designed to meet specific requirements and applications.

RD5 measures 140 x 200 mm or 5.51 x 7.87 inches, a distinctive size that sets it apart from other formats in the ISO series. This particular dimension is not part of the more familiar A, B or C series but belongs to the rarely used D series under ISO standards.

RD5 paper dimensions


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2A046.81 x 66.221189 x 1682119 x 1683370 x 4768
A120.51 x 0.7113 x 181 x 237 x 51
4A066.22 x 93.621682 x 2378168 x 2384768 x 6741
A110.71 x 1.0218 x 262 x 351 x 74
A101.02 x 1.4626 x 373 x 474 x 105
A3+12.95 x 19.02329 x 48333 x 48933 x 1369
A1+23.98 x 35.98609 x 91461 x 911726 x 2591
A0+35.98 x 50.87914 x 129291 x 1292591 x 3662
A64.13 x 5.83105 x 14811 x 15298 x 420
A55.83 x 8.27148 x 21015 x 21420 x 595
A48.27 x 11.69210 x 29721 x 30595 x 842
A311.69 x 16.54297 x 42030 x 42842 x 1191
A91.46 x 2.0537 x 524 x 5105 x 147
A216.54 x 23.39420 x 59442 x 591191 x 1684
A82.05 x 2.9152 x 745 x 7147 x 210
A123.39 x 33.11594 x 84159 x 841684 x 2384
A72.91 x 4.1374 x 1057 x 11210 x 298
A033.11 x 46.81841 x 118984 x 1192384 x 3370

What makes RD5 intriguing is its niche application. It's not typically found in everyday office use or standard print jobs; instead, it's often utilized for specialized tasks where traditional paper sizes may not suffice.

Despite being less prevalent than its A-series counterparts, RD5 adheres to the same aspect ratio principle as other ISO sizes - a square root of two (√2) ratio between width and length. This ensures that when you scale up or down between different sizes within the ISO system, content retains its proportions without distortion - an ingenious design feature that underscores the thoughtfulness behind these standards.

While RD5 may not be as ubiquitous as other paper sizes like A4 or Letter (ANSI), it serves specific needs with precision and consistency thanks to its adherence to international standards. Its unique dimensions make it an interesting addition to any discussion on paper size standards.

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Interesting facts about RD5

1: RD5 paper is a type of paper used for printing and copying.

RD5 paper is a common type of paper used in the printing and copying industry. It is known for its smooth texture and high-quality finish, making it ideal for producing professional documents.

2: RD5 paper belongs to the ISO A series of paper sizes.

The ISO A series is an internationally recognized standard for paper sizes. RD5 paper falls under this series, which includes popular sizes like A0, A1, A2, etc. These sizes are based on the ratio of square root of 2 (√2), resulting in consistent proportions when folded or cut in half.

3: The dimensions of RD5 paper are 210 mm x 148 mm.

RD5 paper measures approximately 210 millimeters by 148 millimeters. This size makes it slightly smaller than a standard letter-sized sheet (8.5 inches x 11 inches) commonly used in North America.

4: RD5 paper is commonly used for brochures and flyers.

Due to its compact size, RD5 paper is often utilized for creating brochures, flyers, and other promotional materials. Its dimensions allow for easy folding into thirds or halves while maintaining a visually appealing layout.

5: The history of global standardization led to the creation of RD5 size.

The development of global standards for various industries prompted the establishment of standardized paper sizes. The ISO A series was introduced to ensure compatibility across different countries and facilitate international communication through printed materials like letters and documents.

6: The aspect ratio of RD5 paper is approximately equal to √2.

The aspect ratio of RD5 paper is the ratio of its longer side to its shorter side. In the case of RD5, this ratio is approximately equal to √2 (1.414). This aspect ratio allows for easy scaling and resizing without distorting the original proportions.

7: RD5 paper is commonly used in European countries.

RD5 paper size is widely used in European countries, where it has become a standard for various printing and copying needs. Its popularity stems from its compatibility with other ISO A series sizes, making it easy to integrate into existing workflows and equipment.

8: RD5 paper can be easily converted into other ISO A series sizes.

One interesting feature of RD5 paper is that it can be easily converted into larger or smaller ISO A series sizes by following the folding or cutting guidelines. For example, folding an RD5 sheet in half results in an A6 size (105 mm x 148 mm).

9: The smooth surface of RD5 paper enhances print quality.

The smooth texture of RD5 paper allows for excellent ink absorption and toner adhesion, resulting in sharp and vibrant prints. This characteristic makes it a preferred choice for high-quality printing applications where image clarity and color accuracy are crucial.

10: The use of standardized paper sizes reduces waste and improves efficiency.

The adoption of standardized paper sizes like RD5 has numerous benefits for businesses and individuals alike. It helps reduce waste by optimizing sheet utilization during printing processes, ensures compatibility with various devices and software systems, and streamlines document handling across different organizations globally.