Alkali-resistant fiberglass mesh cloth 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, and avoid stress concentration. , Resist surface cracking caused by changes in natural temperature and humidity and accidental impact. Therefore, alkali-resistant fiberglass mesh cloth plays an important role in the external insulation system, so the selection of good fiberglass mesh cloth is also an important part of ensuring the overall quality of the external insulation system.
The current national technical standards for external wall insulation: the alkali-resistant tensile breaking strength of the fiberglass mesh in the warp and weft directions shall not be less than /, the alkali-resistant tensile breaking strength retention rate shall not be less than 50%, and the weight per square meter shall be ≥ grams. The alkali-resistant tensile breaking strength of the glass fiber mesh in the warp and weft directions shall not be less than /, the alkali-resistant tensile breaking strength retention rate shall not be less than 90%, and the weight per square meter shall be ≥ grams.
At present, the mesh cloth used in the external wall insulation system on the Chinese market weighs about 10% per square meter, and its strength is generally low. Its normal fracture strength is only /5cm, or even lower. To this end: the technical indicators of mesh cloth for exterior wall insulation projects are required to be standardized, and the purchased alkali-resistant fiberglass mesh cloth must be qualified 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 alkali-resistant fiberglass mesh, it is necessary to pay attention to whether the tensile strength of the alkali-resistant fiberglass mesh itself meets the standards.
