How to tell the quality of glass fiber needle-punched felts

　　The quality of glass fiber needle-punched felts can be assessed using the following methods:

　　Surface observation

　　High-quality products have clean surfaces, evenly aligned and straight mesh patterns with uniform openings—and exhibit excellent toughness. In contrast, inferior products feature rough surfaces, uneven and irregular mesh patterns, and poor flexibility.

　　Chemical stability

　　High-quality products exhibit strong resistance to acid and alkali corrosion, as well as excellent protection against cement erosion and chemical degradation—making them highly safe. In contrast, inferior products are more susceptible to environmental factors and suffer from poor stability.

　　Tensile test

　　High-quality products easily return to their original shape after stretching, with minimal deformation; low-quality products, once stretched, struggle to regain their original form.

　　Combustion characteristics

　　Glass fiber is highly resistant to high temperatures (above 700°C), and when burned, it produces gray smoke and a pungent odor; plastic products, on the other hand, burn at lower temperatures and emit a different kind of smell.