This article analyzes how sandblasting or matt finishing treatment affects the surface structure of PTFE high-temperature cloth. Changes occur in three dimensions: Microscopic morphology transforms from smooth mirror-like to rough gully texture with sharply increased Ra/Rz values, creating 3D mechanical anchoring structures for subsequent bonding. Coating integrity faces risks: PTFE layer thinning, potential exposure of fiberglass substrate (causing loss of non-stick property, moisture penetration, and reduced mechanical strength), plus microcracks and debris generation.