How to distinguish the quality of fiberglass mesh?

High-quality alkali-resistant mesh fabric has three primary objectives: alkali resistance, tensile strength, and crack strain, with alkali resistance being the most crucial. Poor alkali resistance means that even high tensile strength will rapidly decrease within concrete, rendering it ineffective in crack prevention. The alkali resistance of the mesh fabric primarily depends on the composition of the mesh yarn and the alkali-resistant properties of the coating adhesive. However, the quality of alkali-resistant mesh fabrics on the market is currently inconsistent, with counterfeit and substandard products being a cause for concern.

The fiberglass mesh used in substandard mesh fabrics comes in several forms:
First, fiberglass yarn drawn from recycled high-alkali shards of glass in a clay crucible. This type of yarn has low strength, no alkali resistance, and its production is strictly prohibited by the state.

Second, yarn drawn from broken glass spheres in a clay crucible. This type of yarn is brittle, and the individual fibers vary greatly in thickness, thus its strength cannot be guaranteed.

Third, during the twisting process, the above two types of yarn, or clay crucible yarn, are mixed with high-quality platinum crucible yarn, making it difficult for mesh fabric manufacturers and ordinary consumers to distinguish between them. However, mesh fabrics produced from high-quality yarn and substandard yarn will show a clear difference in alkali resistance testing; the alkali resistance of substandard products is generally substandard.