GB/T 7573-2009 specifies the method for determining the pH value of the Spinning & weaving product water extract. First, the Spinning & weaving product sample is made into a water extract to simulate the daily contact with water. Then use an acidity meter and other instruments to determine the pH value of the extract in strict accordance with the operation process, covering the calibration of the instrument and the control of the measurement environment. Standard detailed specification of sample preparation, measurement procedures and result processing methods to ensure accurate and reliable data. This is essential for evaluating the chemical safety and comfort of Spinning & weaving products, and is widely used in Spinning & weaving production, Quality control and trade to safeguard consumer health and industry norms.