Home » News » PTFE Coated Fabric » Analysis by Jiangsu manufacturers of PTFE high-temperature cloth on the function of PTFE materials in thermal insulation cladding for missile engines
Analysis by Jiangsu manufacturers of PTFE high-temperature cloth on the function of PTFE materials in thermal insulation cladding for missile engines
Views: 0 Author: Site Editor Publish Time: 2026-07-23 Origin: Site
I. Efficient Endothermic Thermal Decomposition to Transfer Massive Thermal Load
1. Strong Endothermic Depolymerization Reaction
PTFE (Polytetrafluoroethylene) starts decomposing at approximately 400 °C. Exposed to nearly 3,000 °C combustion gas from engines, it rapidly depolymerizes into tetrafluoroethylene monomers. This chemical bond cleavage is a highly endothermic reaction. Each kilogram of material absorbs substantial heat, converting high-temperature thermal energy into internal gas energy and effectively extracting heat from the wall surface.
2. Block Heat Flux Toward the Housing
As analyzed by Jiangsu PTFE high-temperature cloth manufacturers, this phase change and endothermic decomposition process forms an active cooling barrier on the surface of the thermal insulation layer. It drastically reduces the heat flux conducted to the metallic engine housing and prevents strength loss of the housing caused by excessive temperature.
II. Transpiration Cooling & Gas Film Thermal Insulation to Block Direct Gas Scour
1. Transpiration Cooling Effect
Large volumes of gases such as tetrafluoroethylene generated by PTFE decomposition permeate outward through micro-pores on the insulation layer surface like transpiration under pressure. This mass ejection process removes abundant surface heat and delivers forced cooling.
2. Formation of Low-Temperature Gas Film Boundary Layer
The escaping gases accumulate on the wall to form a flowing gas film that isolates high-temperature combustion gas from the wall. This gas film features extremely high thermal resistance and significantly weakens convective heat transfer. Experiments prove it can reduce near-wall heat flux density by more than 50%.
3. Mitigation of Particle Erosion
The gas film modifies velocity and temperature distribution within the boundary layer, greatly alleviating direct impact and friction of two-phase flow containing metallic particles such as aluminum against the wall and restraining mechanical ablation.
III. Formation of Low-Thermal-Conductivity Char Layer as Physical Thermal Barrier
1. Generation of Porous Carbon Skeleton
After PTFE pyrolysis, residues form a porous carbonaceous structure attached to undecomposed material. This char layer features a 3D network skeleton and maintains certain structural continuity.
2. Extremely Low Thermal Conductivity
As noted by Jiangsu PTFE high-temperature cloth manufacturers, filled with enclosed voids, the char layer possesses far lower thermal conductivity than the original rubber matrix, down to the magnitude of 0.1 W/(m·K). It acts as a major barrier to heat conduction and slows inward heat propagation within the layer.
3. Sustained Thermal Insulation & Structural Support
Though porous, the char layer can withstand certain aerodynamic shear stress, guaranteeing integrity of the thermal insulation structure and shielding deep-layer materials from intense thermal shock during long-duration operation.
IV. Enhanced Scour Resistance & Ablation Resistance for Reliable Cladding
1. Anti-Scour Performance via Low Friction Coefficient
PTFE itself exhibits an ultra-low friction coefficient (~0.04). Filled into the ablation liner, it remarkably lowers frictional shear induced by high-speed particle-laden gas flow, reduces mechanical erosion, and prevents the insulation layer from being "thinned by gas scouring".
2. Uniform & Stable Ablation Characteristics
Its decomposition proceeds steadily and controllably, featuring low ablation rate and good char-forming performance. The insulation layer is consumed slowly and evenly, sustaining effective thickness for extended periods and avoiding housing overheating failure caused by local burn-through.
3. Typical Application Forms
According to Jiangsu PTFE high-temperature cloth manufacturers, in practical engineering, micron-sized PTFE powder is filled into flexible matrices such as EPDM (Ethylene-Propylene-Diene Monomer) rubber and NBR (Nitrile Butadiene Rubber). Combustion chamber insulation liners and propellant grain cladding layers are fabricated via mould pressing or winding processes. These products are widely adopted in solid rocket motors of surface-to-air, anti-ship and other tactical missiles as well as space launch vehicles to secure structural thermal protection.
If you wish to obtain detailed specifications, application scenarios and customized solutions for our full product portfolio, including PTFE high-temperature cloth, PTFE high-temperature adhesive tape, PTFE high-temperature mesh belt, seamless fusing machine belt, single-sided PTFE cloth, high-temperature resistant conveyor belt and high-temperature resistant fiberglass cloth, please contact us via the channels below:
