PP Ducting

PP ductwork is a plastic pipe made by extrusion molding from polypropylene (PP) resin. Its core value lies in utilizing the inherent excellent chemical resistance of PP material to address the issues of traditional metal ducts (such as galvanized iron sheet, stainless steel) being prone to rust, perforation, and having a short lifespan in corrosive environments.

PP piping can withstand corrosion from the majority of acids, bases, and organic solvents (such asHydrochloric AcidSulfuric AcidNitric Acid、Sodium Hydride(Alcohol, etc.), with a lifespan significantly longer than metal pipes, and is particularly suitable for environments such as chemical processing, electroplating, and laboratories. The density of PP material is much lower than that of metal, making PP ducts extremely lightweight. This facilitates easier transportation, handling, and installation, effectively reducing installation costs and labor intensity. Smooth interior walls, low friction resistance - The interior walls of PP pipes are extremely smooth, making them less prone to dust accumulation. The low fluid resistance means that under the same power of the fan, a greater air volume can be achieved, or the required fan power for the same air volume can be reduced, resulting in greater energy savings.

PP material is easily connected by hot melt welding, offering high strength at the weld and excellent sealing, nearly seamless. Special flanges can also be used for connection. Repair and replacement are very convenient in case of local damage.

Section 3: Main Types

Based on structure and application, PP ducts are mainly categorized into:

PP Round Duct (Straight Pipe)

The most common form is circular cross-section, with specifications ranging from several tens of millimeters to over a thousand millimeters. Excellent aerodynamic performance, making it the most frequently used type.

PP Square Duct (Rectangular Duct)

When installation space height is limited, rectangular ducts are used to make more efficient use of space.

PP Reducer/Reducing Coupling

Used for connecting ventilation pipes of different diameters.

PP Elbow/Bend Pipe

Used to change the direction of ventilation pipes, commonly available in 90° and 45° elbows.

PP Tee/Four-way Tee

Fork or manifold for ventilation ducts.

PP Air Valve: Used for adjusting the air volume in ventilation systems.

Four: Connection Method

Hot Melt Welding (most commonly used):

Utilize specialized PP welding torch and rods to heat and melt the pipe material and fittings together. The connection boasts high strength and excellent sealing, almost becoming a single entity.

Flange Connection:

Welded PP flange at the pipe end, then secured the two flanges together with bolts, with a sealing gasket in between. Easy for disassembly and maintenance.

Socket and Spigot Joint

For small diameter pipes, socket-and-spigot jointing (using PP-specific adhesive) is recommended.

In summary, PP ducting is the "expert" in tackling the challenges of corrosive gas conveyance. It excels in medium to low-temperature, highly corrosive environments, and has become the standard ventilation pipe material in industries like chemicals and laboratories, thanks to its lightweight, corrosion-resistant, and energy-saving benefits. However, when selecting, it's crucial to pay close attention to its temperature resistance limits and outdoor aging resistance issues.