Gray polypropylene corrosion-resistant exhaust duct with welded flanges

Cleanroom Air Distribution Systems

PP Corrosion-Resistant Exhaust Duct

A welded polypropylene duct system for extracting humid or chemically aggressive air that would rapidly attack ordinary galvanized steel ductwork.

Chemical-Resistant PP Wall
Thermoplastic Welded Seams
Smooth Non-Metallic Interior
Rectangular or Round Fabrication

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Product Introduction

Polypropylene exhaust ductwork provides a non-metallic path for corrosive vapors from laboratories, chemical rooms and wet processes. Straight sections and fittings are fabricated from homogeneous PP sheet or pipe, joined by hot-gas or extrusion welding to create continuous thermoplastic seams. Round duct is preferred for pressure stability, while rectangular sections integrate with scrubbers and equipment plenums. Supports allow for thermal expansion, and the selected PP grade is matched to the chemical concentration and operating temperature.

Key Features

Homogeneous polypropylene resists many acids, alkalis and humid exhaust conditions without a metal coating.

Thermoplastic welding creates continuous seams of compatible material rather than exposed mechanical folds.

The smooth low-surface-energy interior discourages residue adhesion and simplifies rinsing.

Lightweight fabricated sections reduce support loads compared with thick corrosion-resistant metal systems.

Customer Product Concerns

Corrosive exhaust selection must consider the complete chemical mixture, condensate, temperature and thermal movement rather than material name alone.

Acidic condensate removes zinc coating and perforates steel exhaust duct.A compatible PP grade provides corrosion resistance through the full wall thickness.

Rigidly fixed plastic duct buckles as operating temperature changes.Guided supports and planned expansion sections allow controlled axial movement.

Poor field welds leave pinholes in hazardous exhaust seams.Qualified thermoplastic welding and visual seam inspection produce continuous fusion joints.

An incompatible solvent softens the selected plastic.Material selection is checked against the actual vapor and condensate composition before fabrication.

Typical Applications

Laboratory fume extractionChemical storage-room exhaustWet-process ventilationBattery manufacturing exhaustScrubber inlet and outlet ductwork

Technical Parameters

Representative ranges for fabricated polypropylene corrosive-exhaust ductwork are listed below.

Core Material	PP-H polypropylene sheet or extruded pipe
Panel Thickness	3–10 mm, selected by section size and pressure
Effective Width	110–1200 mm round diameter or rectangular side dimension
Maximum Length	3000–5000 mm per fabricated straight section
Steel Facing Thickness	3–10 mm homogeneous PP wall in place of steel facing
Core Density	Approximately 900–920 kg/m³ solid polypropylene
Thermal Conductivity	Approximately 0.22 W/(m·K) for polypropylene
Surface Finish	Smooth natural gray PP surface with optional conductive black grade
Joint Type	Hot-gas or extrusion-welded seam with welded flange or socket connection
Customization	Available based on the intended application and operating environment.

Available Options

PP-H, flame-retardant PP or conductive PPRound or rectangular geometryWelded inspection openings and drainsExpansion joints and scrubber transition pieces

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