What is the use of glass yarn?

glass yarn is a reinforcing material for the exterior wall insulation surface layer. Its main function is to improve the mechanical strength of the surface layer, ensure the resistance continuity of the facing layer, disperse the shrinkage pressure and insulation stress of the surface layer, avoid stress concentration, and resist natural temperature. , surface cracking caused by humidity changes and accidental impact. Therefore, glass yarn plays an important role in the external insulation system, so choosing a good glass yarn is also an important part of ensuring the overall quality of the external insulation system.

The current national technical standard for external wall thermal insulation (JG149-2003): the alkali-resistant tensile breaking strength of the Glass Fiber Fiber Glass in the warp and weft directions shall not be less than 750N/50mm, and the alkali-resistant tensile breaking strength retention rate shall not be less than 50%, per square meter Rice weight ≥130 grams. The alkali-resistant tensile breaking strength of JG158-2004 glass fiber Fiber Glass in both the warp and weft directions shall not be less than 1250N/50mm, the alkali-resistant tensile breaking strength retention rate shall not be less than 90%, and the weight per square meter shall be ≥160 grams.
At present, the glass yarn used for exterior wall insulation systems on the Chinese market weighs about 130g per square meter, and its strength is generally low. Its normal fracture strength is only 1000N/5cm, or even lower. To this end: the technical indicators of glass yarn for exterior wall insulation projects are required to be standardized, and the purchased glass yarn must be confirmed before use. When controlling cracks in external wall insulation, not only the insulation layer material is required to have a certain tensile strength and ultimate stretch, but the crack-resistant protective layer material is also required to have sufficient tensile strength. For this reason, when choosing glass yarn, it is necessary to pay attention to whether the tensile strength of the glass yarn itself meets the standards.
2. The use of glass yarn compounded in the plastering mortar: on the one hand, it can effectively increase the tensile strength of the protective layer; on the other hand, it can effectively disperse the stress and disperse the wider cracks that may have occurred into many smaller ones. cracks, thereby forming its anti-cracking effect. The surface coating material and coating amount are of great significance to the alkali resistance of fiberglass Fiber Glass, and the fiberglass variety is decisive for long-term alkali resistance.
The overlap width between glass yarn is not less than 50mm. The glass yarn at the inner corners must be pressed and overlapped. The width is ≥50mm and the width at the outer corners is ≥200mm. During construction, the grid cloth must be laid flat, without wrinkles, and the mortar fullness should reach 100%. At the same time, it must be smoothed and straightened, and the squareness and verticality of the yin and yang corners must be maintained.