GB/T 23442-2009

This standard specifies test methods for determining the structure and morphology of polyacrylonitrile (PAN) precursor fibers used in carbon fiber production. It is applied in the manufacturing and quality control of PAN-based carbon fibers, particularly for aerospace, automotive, and industrial composite materials where fiber uniformity and defect analysis are critical. The standard guides engineers in evaluating precursor fiber properties through techniques like microscopy and X-ray diffraction to ensure consistent carbon fiber performance.