This article covers functions of PTFE in thermal insulation cladding for missile engines. Four mechanisms: Endothermic decomposition — PTFE depolymerizes at ~400°C to tetrafluoroethylene (highly endothermic, ~3,000°C combustion gas exposure), absorbing massive heat and extracting thermal energy from wall surface. Transpiration cooling and gas film insulation — decomposition gases (tetrafluoroethylene) permeate outward through micro-pores, removing surface heat; flowing gas film isolates high-temperature combustion gas from wall, reducing near-wall heat flux by >50%; gas film modifies boundary layer velocity/temperature, alleviating particle erosion.

This technical brief from Jiangsu Aokai analyzes how excessively low or high sintering temperatures damage PTFE high-temperature cloth. Low sintering leaves particles unmelted, causing micro-pores, weak coating-substrate bonding, rough surfaces, poor mechanical strength, and milky opaque appearance. Overheating induces PTFE thermal degradation, generating pinholes, bubbles, brittleness, yellow-to-black discoloration, and releasing toxic fumes. Both extremes destroy compactness, non-stick performance, flexibility, insulation, and dimensional stability.

PTFE impregnation is not limited to fiberglass cloth. This article introduces 7 alternative substrates – aramid, carbon fiber, PBI, porous metal, graphite, asbestos (phased out), and ceramic fillers – with their process features, advantages, limitations, and key applications.

As a professional manufacturer of PTFE high-temperature fabrics, Jiangsu Aokai New Materials gives you professional insights. The core purpose of fiberglass surface treatment is to build a molecular bridge between inorganic fiberglass and organic PTFE, so as to fundamentally solve their inherent inc