Slag ball content is one of the important indexes to measure the performance of ceramic fiber module. So what is a slag ball?
In the process of spinning ceramic fibers into fibers, the vigilant particles that are not fibrotic are called slag balls. Generally speaking, the particle size is greater than 0.212mm, and the unit weight is 2800 ~ 3200kg / M? All will be classified as slag balls.
The influence of slag ball is first reflected in reducing the thermal insulation effect of ceramic fiber module. The greater the thermal conductivity of slag ball, the higher the content of slag ball, the greater the thermal conductivity of ceramic fiber, and the corresponding thermal insulation performance will be weakened.
From the structure of ceramic fiber itself, the slag ball content is large, which is the product of incomplete fiber, and the tensile strength and toughness of fiber will also be affected. This means that the higher the slag ball content, the lower the fiber strength.
The content of slag ball is clearly stipulated in the national standard ceramic fiber.
In foreign countries, the content of slag balls with particle size > 0.25mm is controlled at ≤ 5%, while in China, due to the limitation of fiber manufacturing technology, the content of slag balls is controlled at ≤ 15%, that is, nearly 1 / 8 of ceramic fiber products are slag balls, which is twice as high as that in foreign countries. This is also the reason why foreign ceramic fibers sell at a sky high price.
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