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Some technical parameters about glass fiber that you don't know

Alkali content
  In daily production, everyone knows that fiberglasses can be divided into non-alkali and medium-alkali, but how to define it, I believe many friends are not very clear. This is related to a problem of alkali content, mainly referring to the content of alkali metal oxides.

  According to the alkali content, glass fibers are mainly divided into three types:
①Alkali-free fiberglass unghie (sodium oxide 0%~2%, belongs to aluminoborosilicate glass)
②Medium-alkali fiberglass usa (sodium oxide 8% to 12%, belongs to boron-containing or boron-free soda-lime silicate glass)
③High alkali fibra de vidrio méxico (more than 13% sodium oxide, belonging to soda lime silicate glass)

  It can be seen that the alkali-free that everyone often says is not really alkali-free, but the alkali metal content is less than 2%. Generally, alkali-free and medium-alkali glass fibers are mainly used in composite materials.


Monofilament diameter
  The diameter of fiberglass tül monofilament is generally several microns to twenty microns, which is equivalent to 1/20-1/5 of a hair.

  Crude fiber: Its monofilament diameter is generally 30 μm.
  Primary fiber: its monofilament diameter is greater than 20 μm.
  Intermediate fiber: monofilament diameter 10-20μm.
  Advanced fiber (also known as textile fiber): its monofilament diameter is 3-10 μm.

  Glass fibers with a monofilament diameter less than 4um are also called ultrafine fibers. Different diameters of monofilaments not only have different properties of fibers, but also affect the production process, output and cost of fibers. Generally, 5-10um fiber is used for textile products, and 10-14um fiber is generally suitable for fiberglass weave, fiberglass plain cloth, fibre glass matt, etc.

  The diameter of the monofilament is determined by the diameter of the platinum bushing and the wire drawing speed. Generally, the thinner the monofilament, the more expensive the fiber cost. On the one hand, it is related to the difficult production process and low yield; on the other hand, the finer the monofilament, the more coupling agent per unit area.
  Tex , abbreviated as special, is a unit of linear density, also known as number. Refers to the weight in grams of 1000 meters long yarn at a predetermined moisture regain, tex=g/L*1000, where g is the weight of the yarn (or silk) (grams), and L is the length of the yarn (or silk) (m) . It is a fixed-length unit, and the larger the gram weight, the thicker the yarn.

  Each bundle of fiberglass strands consists of hundreds or even thousands of monofilaments, so in simple terms, tex is a measure of the thickness of a single fiberglass yarn for braiding. Our common 1200, 2400, and 4800 numbers all refer to the linear density of the yarn, that is, the weight of the yarn per kilometer is 1200g, 2400g, and 4800g.
Moisture content
  Fiberglass tunisie needs to strictly control the moisture content in the production process. According to the industry standard, the moisture content of glass fiber should be lower than 0.2%. We often ignore this parameter in daily production. Due to the imperfect storage conditions of most factories, the randomly placed glass fibers are easy to absorb moisture, so the moisture content will be too high and the curing of the resin will be affected.

  This phenomenon needs special attention when "returning to the south" in the south. Before using, you can bake the glass fiber a little to control the moisture content.