Heat‑proof Rectangular Fabric Expansion Joint for Flue Gas & Air Duct System

 High Quality Fabric Air Duct Non-Metallic Expansion Joint for Industrial Ventilation System

Here is a comprehensive, export-oriented technical & marketing guide for High Quality Fabric Air Duct Non-Metallic Expansion Joints (also called Fabric Expansion Joints/Non-Metallic Compensators), including structure, materials, performance, applications, standard specs, and multi-version English titles for Made-in-China platform promotion, plus white-background product visuals.
1. Core Structure & Material Options
It is a multi-layer composite flexible component paired with metal frames (flanges, clamping plates, fasteners), with typical functional layers from inside to outside:
Sealing/Medium Contact Layer: Silicone rubber (260°C continuous), FPM(200°C, excellent chemical resistance), PTFE film (260°C, strong acid/alkali resistance)
Insulation Layer: Ceramic fiber blanket, fiberglass needle-punched felt (blocks heat transfer, protects outer layers/bolts)
Structural Reinforcement Layer: High-strength fiberglass fabric, aramid (Kevlar) fabric (bears internal pressure, resists vacuum)
Outer Protection Layer: UV-resistant silicone-coated fabric, PVC-coated fabric (prevents weathering, moisture, mechanical damage)
Metal Accessories: Carbon steel/Q235 or 304/316 stainless steel flanges, retaining rings, flow baffles (anti-abrasion for dust-laden gas)