How is the difference between medium alkali and alkali-free glass fiber and high alkali glass fiber?
A simple method for distinguishing between alkali-free, alkali-free glass fibers and high-alkali glass fibers is to pull a single fiber yarn by hand. Generally, alkali-free glass fibers have high mechanical strength and are not easy to break. The glass fiber is gently pulled off. Observation with the naked eye shows that the alkali-free and medium-alkali glass fiber yarns are generally free of wool yarns, while the high-alkali glass fiber yarns have particularly severe wool yarns, and many broken filaments pierce the yarn counts.
How to identify the quality of glass fiber yarn?
Glass fiber is made of glass as raw material and processed by various molding methods in the molten state. Generally divided into continuous glass fiber and discontinuous glass fiber. There are many continuous glass fibers on the market. There are two main types of continuous glass fiber produced according to China’s current standards. One is medium alkali glass fiber, coded as C; the other is alkali free glass fiber, coded as E. The main difference between them is the content of alkali metal oxides. The alkali glass fiber is (12 ± 0.5)%, and the alkali-free glass fiber is <0.5%. There is also a glass fiber on the market as a non-standard product. Generally known as high alkali glass fiber. Its alkali metal oxide content is above 14%. The production raw materials are broken flat glass or glass bottles. This glass fiber has poor water resistance, low mechanical strength, and low electrical insulation, and is not allowed to be produced according to national regulations.
Generally qualified medium-alkali and alkali-free glass fiber yarn products must be tightly wound on the bobbin. Each bobbin is marked with the number, the number of strands and the grade, and the product should be inspected and verified in the packing box. Product inspection and verification includes:
1. Name of the manufacturer;
2. Product code and grade;
3. The number of this standard;
4. Stamp the special stamp for quality inspection;
5. Net weight;
6. The packing box should have the factory name, product code and grade, standard number, net weight, production date and batch number, etc.
How to recycle glass fiber waste yarn and yarn?
After the waste glass is broken, it can generally be used as a raw material for glass products again. The problem of foreign matter \ wetting agent residue needs to be solved. Waste yarn can be used as general fiberglass products such as felt, fiberglass, and tile.
How can long-term exposure to glass fiber yarn avoid occupational diseases?
Production operations must wear professional masks, gloves and sleeves to avoid direct skin contact with fiberglass yarn.
Post time: Jan-08-2020