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2004-07-28 08:00:00

Carbon fiber is 1K, 3K, 6K, 12K What does it mean?

This is the specification of the carbon fiber and refers to the number of monofilaments in the carbon fiber tow

This is the specification of the carbon fiber and refers to the number of monofilaments in the carbon fiber tow, 1K=1000 (root), 3K=3000 (root), 6K=6000 (root), 12K=12000 (root). At the same time, 1K, 3K, 6K, 12K are also called small tows.


Here is the relationship between carbon fiber performance and the number of monofilaments:


According to the number of monofilaments in the carbon fiber tow, the carbon fiber can be divided into two types: small to large tow. Compared with the small tow, the disadvantage of the large tow is that the tow should not be unwound when a structure such as a sheet is produced, resulting in an increase in the thickness of the single layer, which is not conducive to structural design. In addition, there are more phenomena such as blocking and broken filaments in the large tow carbon fiber, which will affect the strength and rigidity, reduce the performance, and disperse the performance. Aircraft and spacecraft generally use only small tow carbon fiber, so small tow carbon fiber is also called "aerospace grade" carbon fiber, and large tow carbon fiber is called "industrial grade" carbon fiber.


However, the production cost of large tow is lower than that of small tow. With the advancement of production technology, people are familiar with the structure of carbon fiber materials, and large tow carbon fibers are increasingly used in areas where reliability is demanding. In this way, the distinction between small and large tow has also changed, as in the early days when the number of monofilaments in the tow was 12,000 (12K) as the dividing line, but currently the number of monofilaments 1K to 24K is divided into small ones. The tow, while the 48K above is classified as a large tow. Airbus has already started to use 24K carbon fiber when manufacturing the A380 super passenger aircraft. It is estimated that as the technology advances, the boundary between the small and large tows will also push up.


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