Poly Allied Products manufactures a comprehensive range of HDPE pipe with qualified experienced plastic engineers. PAP has a strong focus and dedication to innovation and quality in HDPE pipe technologies.  We also offer a complete range of jointing systems including electrofusion, stub end, backing rings, mechanical compression couplings and accessories.


The advantageous properties of HDPE Pipes & Ducts make them suitable for numerous applications. Some of these are:

Water Supply

  • Potable water supply
  •  Water mains
  •  Distribution systems
  •  Service Pipes

Sewage & industrial effluent disposal

  •  Domestic Sewage System
  •  Sanitary System
  •  Petrochemical Industry
  •  Fertilizer Industry

Drainage Pipes

  • Surface & Rain water
  •  Waste Water Mains
  •  Sub-soil water

Agriculture & Irrigation

  • Flood Irrigation (Suction & Delivery pipes in pump sets)
  •  Sprinkler Irrigation (Crops, Lawns, Golf course, Gardens)
  •  Drip irrigation (Plantations, Orchards, Nurseries)

Electrical And Comressed Air

  • Conduits for Cables
  • Compressed air supply


Air-conditioning & Refrigeration Telecommunication, as conduits for OFC Extraction of Fumes Sawdust extraction systems

Advantages of Polyethylene Pipe

The Long-Lasting Advantages of HDPE Pipe.

High Density Polyethylene Pipe (HDPE) is a thermoplastic pipe made from material that can be melted and reformed. It is rugged, flexible, and durable.  It has outstanding chemical and environmental stress crack resistance. Relative to existing infrastructure, like ductile iron, concrete or PVC, HDPE seems like a new product.

Corrosion Resistance

Corrosion is one of the most-costly problems associated with metal piping systems. Unlike traditional metal infrastructure products, HDPE pipe does not rust, rot or corrode.  It is resistant to biological growth. This means an extended service life and long-term cost savings.

Fatigue Resistance

HDPE pipe is flexible and ductile, not rigid. It has outstanding resistance to fatigue.  Unlike other plastic pipes, it is designed and pressure rated to handle the kind of occasional and recurring surge events that are common in water distribution systems.

Extended Service Life

HDPE pipe is a safe and durable product ideal for your piping infrastructure. The service life of HDPE is estimated to be between 50 to 100 years, depending on application, design and installation.

Leak-Free Joints

An independent study reports that municipalities in 43 states average a water loss of 16% due to leaking joints. Some report water losses as high as 50%.Traditional infrastructure piping is joined with bell and spigot or mechanical type joints and all acknowledge a specified leakage factor. Not only is our most precious resource being lost, but leaking pipes are costing our cities money. HDPE piping systems can be joined with heat fusion to produce permanent leak free joints.

Fusion Joints

HDPE piping systems can be joined with heat fusion welds. Heat fusion involves the heating of two HDPE surfaces then bringing them together to form a permanent, monolithic, leak-free system.Unlike the fusion process developed for other plastics pipes, the fusion process for HDPE is proven and has been used by the natural gas industry for over 40 years. Approximately 95% of all gas distribution piping in the United States is polyethylene pipe joined by heat fusion.Fusing HDPE pipe is not difficult and personnel can be trained in the process.

Trenchless Installation

Traditional piping systems are installed by open cut (digging a ditch), resulting in traffic and environmental disruption. HDPE can be installed using this traditional open-cut method or by utilizing eco-friendly trenchless technology.HDPE pipe can be installed utilizing trenchless technology under creeks, rivers, lakes, roads, or right-of-ways with minimal environmental and public disruption.The flexibility of HDPE, combined with its outstanding tensile strength and abrasion resistance, make it the preferred and proven choice for trenchless installation technology.

When compared to a non-plastic pipe installed using the open-cut method, a leak-free HDPE system installed utilizing less invasive trenchless technology is more cost effective.

Pipeline Rehabilitation

Trenchless technologies are also used to rehabilitate old, failing pipelines with HDPE. There are several technologies to choose from when rehabilitating old pipelines.  These technologies include slip lining and pipe bursting.  Both are excellent techniques for cities to revitalize or replace and upsize older existing infrastructure.



In addition to its outstanding physical characteristics, HDPE is recognized for its minimal impact on the environment:

  • It takes less energy to manufacture HDPE than non-plastic pipes.
  • HDPE is lightweight and is often more cost effective to transport than metal pipes.
  • The flexibility of HDPE, combined with the use of heat fusion to join the pipe, means fewer fittings are required.
  • HDPE pipe joined with heat fusion provides leak free connections.
  • HDPE does not emit potentially hazardous levels of toxins into the air during production, during fusion or into the ground or water during use.
  • HDPE pipe can be recycled back into non-pressure piping application.

Quality Assurance

Poly Allied Products meets the tough requirements of the AS/NZS 4130, 4401, 5065 standards.

Which provides confidence when installed. As an ISO9001 accredited manufacturer, Poly Allied Products has qualified plastic engineer, in house laboratory’ experience and technical knowledge dedicated to deliver the highest quality finished product.

Hdpe Pipe Diameters And Ratings (Pe 100)

Size PN4 PN6.3 PN8  PN10   PN12.5 PN16 
Diameter SDR41 SDR26 SDR21 SDR17 SDR13.6 SDR11
OD mm ID mm ID mm ID mm ID mm ID mm ID mm
16 13.7 12.6
20 17.7 16.7 16.1
25 21.7 21.1 20.1
32 28.7 28.1 26.9 25.9
40 36.9 36.1 35 33.8 32.3
50 46.2 45.1 43.9 42.4 40.4
63 58.1 56.9 55.2 53.3 51
75 69.2 67.7 65.8 63.7 60.9
90 85.6 82.9 81.3 78.9 76.5 73.1
110 104.7 101.3 99.2 96.5 93.3 89.4
125 118.9 115.4 112.9 109.9 106.1 101.5
160 152.3 147.6 144.5 140.7 135.9 129.9
200 190.5 184.6 180.6 175.8 169.9 162.5
250 237.9 230.9 226.1 219.9 212.4 203.4
315 300.1 290.9 284.9 277.1 267.6 256.3

(315 mm and above upon applications.)


SDR: Nominal ratio of outside diameter to wall thickness.

PN: Pressure rating at 20DC (MPa multiplied by 10).

PE Classification: Long term rupture stress at 20DC (MPa multiplied by 10) to which the minimum safety factor of

1.25 is applied in order to obtain the 20DC design hoop stress.

Standard Colour Code Chart(Middle of Pipe)

Drinking Water Blue
Electrical Conduit Orange
Fuel gases, process gases, liquified gases under pressure Yellow
Fire Service Water Red
Rural/Raw Water Green
Recycled/Reclaimed Water Purple
Sewer Flex Grey
Pressure Sewer Cream
Communications Conduit and above ground pipe lines White

Our product includes Field butt fusion welding machine, Full-Automatic Multi-angle fitting welding machine, Multi-angle cutting machine, Saddle fusion machine, Arched surface cutter, butt welding machine with data logger and printer, Full-Automatic butt fusion machine, Drainage Welding Machine and Special assistant tools for PE and PP pipes construction etc.