IFAN Hot Sale PPR Water Pipe Fittings

Understanding PPR Dimensions

PPR pipes and fittings use the metric system. The key measurement is the outer diameter (OD) in millimeters . Common sizes range from 16mm to 160mm . Larger diameters exist for industrial applications. This standardization ensures global compatibility.

The Standard Size Range

For residential use, 20mm, 25mm, and 32mm are typical . Commercial buildings often use 40mm to 63mm . Industrial applications may require 75mm to 160mm . A 90mm pipe serves as a main water line for larger facilities .

Understanding SDR and S Values

Wall thickness is defined by two related systems. SDR means Standard Dimension Ratio. It is the OD divided by the wall thickness . A lower SDR means a thicker, stronger pipe wall. The “S” series is another dimensionless value . The relationship is SDR = 2S + 1 .

The PN Pressure Rating System

PPR pipes are grouped by PN (Pressure Nominal) ratings. Common ratings are PN10, PN16, PN20, and PN25 . PN10 is for low-pressure cold water only. PN16 is a universal choice for many systems . PN20 and PN25 are for high-pressure or hot water applications .

S5 / PN10 / SDR 11 (Cold Water)

The S5 series has the thinnest wall for a given OD . A 20mm S5 pipe has a wall of just 2.0mm . It is rated PN10 (10 bar/145 psi) . This is suitable for cold water only. It is not approved for continuous hot water service.

S4 / PN12.5 / SDR 9 (Light Duty)

The S4 series offers a slightly thicker wall for added strength. A 20mm S4 pipe has a 2.3mm wall . Its pressure rating is PN12.5 (12.5 bar) . It can handle some warm water exposure. However, it is not the standard recommendation for hot water mains.

S3.2 / PN16 / SDR 7.4 (Most Common)

This is the most widely used series for general plumbing . A 25mm S3.2 pipe has a 3.5mm wall . A 90mm S3.2 pipe has a 12.3mm wall . It is rated for PN16 (16 bar/232 psi) . It handles hot water up to 60°C continuously .

S2.5 / PN20 / SDR 6 (Heavy Duty)

This series has a very thick wall for high pressure. A 25mm S2.5 pipe has a 4.2mm wall . It is rated for PN20 (20 bar/290 psi) . This is often specified for high-rise buildings. It provides an extra safety margin for fluctuating pressure.

S2 / PN25 / SDR 5 (Industrial Grade)

The S2 series offers the thickest walls available. A 20mm S2 pipe has a 3.4mm wall . It is rated for PN25 (25 bar/362 psi) . This is for industrial or special high-pressure systems. It is rarely needed for standard residential water supply.

Detailed Wall Thickness Table (mm)

Data compiled from .

Fitting Wall Thickness Standards

PPR water pipe fittings are designed to match pipe dimensions. The fitting socket wall must be at least as thick as the pipe wall . Most quality manufacturers produce fittings to the S2.5 or S3.2 standard . This ensures compatibility across brands that follow DIN/ISO standards . Always verify that the fitting’s pressure rating matches your pipe system to ensure a proper fusion weld.

Conclusion on Available Sizes

PPR water pipe fittings are available from 16mm to 160mm OD. Wall thickness varies by series from S5 (thin) to S2 (thick). The S3.2 / PN16 series is the most common for residential use . Always match the fitting’s SDR or S series to your pipe. Thicker walls provide higher pressure ratings and longer hot water service life.