Updated: May 16, 2026

HDPE Pipe Size Chart Malaysia: Full OD, Wall Thickness & SDR Table

Quick Summary

Choosing the right HDPE pipe isn’t just about diameter. Two pipes can share the same outer diameter but have completely different wall thicknesses, pressure ratings, and prices. If you order by diameter alone, you can end up with a pipe that’s wrong for the pressure your system needs.

This guide breaks down how HDPE pipe sizing actually works in Malaysia, and gives you a clear reference table you can use when ordering.

Every HDPE pipe on the market is defined by three numbers working together – and understanding how they connect is the key to ordering correctly. Get any one of them wrong and you could end up with a pipe that doesn’t meet your project’s pressure requirements, or one that costs more than necessary.

This guide gives you the complete size chart for PE100 pipes commonly available in Malaysia, explains the relationship between OD, SDR, and PN ratings, and shows you exactly how to specify your order to avoid mistakes.

The Three Numbers That Define Every HDPE Pipe

Every HDPE (poly) pipe is described by three specifications working together:

OD (Outer Diameter): The outside measurement in millimetres (e.g. 110mm). This stays the same for a given size regardless of pressure rating, which is what lets fittings be standardised.
PN (Pressure Nominal): The maximum working pressure in bar at 20°C (e.g. PN10 = 10 bar). Higher PN means a thicker wall and higher pressure capacity.
SDR (Standard Dimension Ratio): The ratio of OD to wall thickness. A lower SDR means a thicker wall and a higher pressure rating.

The simple formula: SDR = OD ÷ wall thickness. A 110mm pipe with a 10mm wall has an SDR of 11.

How SDR, PN and Material Grade Connect

Here’s the part that confuses most buyers: the same SDR gives a different PN depending on whether the pipe is PE80 or PE100. PE100 is a stronger material, so at the same wall thickness it holds more pressure.

SDR	PN Rating (PE80)	PN Rating (PE100)
SDR 26	PN 5	PN 6.3
SDR 21	PN 6.3	PN 8
SDR 17	PN 8	PN 10
SDR 13.6	PN 10	PN 12.5
SDR 11	PN 12.5	PN 16
SDR 9	PN 16	PN 20

This is exactly why two pipes labelled “110mm” can be priced very differently – they may be different SDRs and grades. Always quote OD + PN + grade together. For the full breakdown of grades, see our guide on PE80 vs PE100 HDPE pipe.

HDPE Pipe Size & Wall Thickness Reference (PE100)

Approximate minimum wall thickness (mm) for common Malaysian sizes, to MS 1058 / ISO 4427. Use this as a planning reference and confirm exact specs on your quote.

OD (mm)	PN10 (SDR17) Wall	PN12.5 (SDR13.6) Wall	PN16 (SDR11) Wall
20	—	—	2.0
25	—	2.0	2.3
32	2.0	2.4	3.0
50	3.0	3.7	4.6
63	3.8	4.7	5.8
90	5.4	6.7	8.2
110	6.6	8.1	10.0
160	9.5	11.8	14.6
200	11.9	14.7	18.2
250	14.8	18.4	22.7
315	18.7	23.2	28.6

Note: Smaller sizes (20–32mm) are rarely made in the lower pressure ratings because the wall would be too thin to handle, which is why some cells are blank.

Standard Lengths and Coils in Malaysia

Straight pipes: 6m and 12m lengths (common for larger diameters from ~63mm up)
Coils: 50m and 100m (common for smaller diameters up to ~110mm, ideal for irrigation and long runs with fewer joints)

How to Order Without Mistakes

When you request a quote, state all four specifications: Size (OD) + Pressure rating (PN) + Grade (PE80/PE100) + Length/coil.

Example: “110mm × 100m HDPE PN10 PE100 coil, SIRIM.”

Browse our full range of HDPE pipe in Malaysia – we stock PN6 to PN16 in PE80 and PE100, all SIRIM-certified, from our Melaka warehouse. Not sure which spec your project needs? WhatsApp us with your application and we’ll advise.

Frequently Asked Questions

What is the difference between OD and nominal size for HDPE pipe?

For HDPE pipe in Malaysia, the size quoted (e.g. 110mm) is the actual outer diameter. The internal diameter changes depending on wall thickness and PN rating.

What does SDR11 mean on an HDPE pipe?

SDR11 means the outer diameter is 11 times the wall thickness – a relatively thick wall. In PE100, SDR11 equals a PN16 (16 bar) pressure rating.

Can I mix PE80 and PE100 pipe in one system?

They can connect with the right fittings, but they have different pressure ratings at the same wall thickness, so design your system around the lower-rated pipe. For joining methods, see our guide on how to connect HDPE pipe.