PVC Pipes: Schedule 40 VS 80

Hello people, today I’m going to share a well-researched guide on schedule 40 vs 80 PVC pipes. Everything you need to know about them is mentioned in this piece.

Schedule 40 VS Schedule 80: PVC Pipes 

Pipe scheduling can be a rigorous task, that is, if you don’t know what to do. Although scheduling is an essential part of pumping, most people falter because they don’t even know what scheduling actually is. Scheduling in piping has nothing to do with the human concept of timetable or time management; rather, it’s a measurement pattern. For example, scheduling a fabrication mechanism utilized to figure out a plumbing material’s total wall thickness depending on the full size of the pipe (including width, not length).

In laymen’s terms, a pipe schedule is a typical standard for how thick a pipe’s wall should be established upon how wide/large the pipe is in diameter.

You might have noticed that the outside diameter of both Schedule 40 and 80 pipes are the same, but 80 pipe has thicker walls; thus, schedule 80 pipes are a bit more expensive than their 40 counterparts. The Scheduling system came into the picture as a standard of measuring as there was a need to have a universal system for referring to PVC.

Since different wall thicknesses are used in different applications, the ASTM society developed the Schedule 40 and 80 systems to categorize the two common groups.

Comparison: Schedule 40 VS Schedule 80 Pipes 

  • Thickness 
  • Pressure 
  • Cost 
  • Colour 
  • Installation 
  • NPS and Outer, Inner Diameter
  • Application and Use

Interesting Read – CPVC VS PVC | Difference Between PVC and CPVC


Pipe wall thickness is the key physical difference between Schedule 40 and Schedule 80. The higher the schedule rating, the thicker the pipes and fitting will be. As a result, schedule 40 will have thinner walls than Schedule 80 in the same specified size. That means less material equals a weaker product, which in turn can hamper its project’s compatibility if the solidarity of the pipe is in the question of the desired application.

Higher schedule pipes that are thicker will have higher structural and chemical durability and rigidity to strain, pressure, and harsh environmental conditions.


The maximum PSI pressure rating of a pipe can be figured out by its scheduling. Pipes and firings with higher Schedule numbers are better for pressure handling. Their higher tolerance for continuous fluid pressure is a direct outcome of their increased material thickness specified by the pipe schedule.

Generally, 80 is a more reliable choice for a high-pressurized liquid application schedule. However, Schedule 40 can also be utilized if the application pressure ranges are well within the piping’s guidelines. You can refer to the table below about both Schedule 40 and 80 sizes, dimensions, and working pressure.


Not surprisingly, Schedule 80 pipes are expensive compared to Schedule 40 pipes because of the additional material used to make their sidewall thicker. In addition, any included colorant (if applicable) can also zip the overall manufacturing cost.


Schedule 40 ad 80 pipes are often colored with different colors to give them a distinct identity. Sch 40 plumbing pipes are naturally white, lacking coloring additives; on the other hand, Schedule 80 pipes are colored grey. Note that it’s not mandatory to follow that color pattern, and outliers to the norm also exist.

While color is a reliable way to identify which type of pipe you’re dealing with; however, remain cautious and always go through printed labels on the side of the pipes.

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The installation process and parameters are the same for Schedule40/80 pipes that have been made from the same material. According to ASTM standards, outside diameters will be equal across schedules of pipes that have equal NPS. This provision allows pipes of different scheduling to be joined together using the normal fitting method for that piping material.

NPS and Outer, Inner Diameter

The Normal Pipe Size (NPS) measurements for both Sch 40 and 80 piping will be the same for the same pipe size. NPS is similar to pipe Outer Diameter (OD) measurement, which will be the same for schedule 40 and 80 pipes. What differs between the two is the Inner Diameter (ID) measurements. In Sch 80, the ID increases significantly because of the extra material used to make its sidewalls on the inside thicker. The reduced inner diameter of the Sch 80 pipe makes the fluid flow a bit slower.

Applications and Use

If you’re planning a home repair or an irrigation project, Sch 40 is the definitive choice. Even Schedule 40 pipes can handle a good amount of pressure, making them more than adequate for home applications, and it is cheaper than Sch 80; it won’t be hard on your wallet.

However, if your application includes moving industrial chemicals, Schedule 40 pipes aren’t the best choice. Go for Schedule 80 with thicker sidewalls, and you’ll be fine. These pipes can handle high pressure and stress.

Schedule 40 vs. 80 is all about that. Piping applications are particular, and only after detailed examination and analysis can one determine what needs to be done. Full variables of the pipe’s intended use should be considered to get the best results.

Engaging Read – What are PVC Pipe Sizes? | What are PVC Pipe Dimensions? | The Complete Guide

PVC and CPVC Properties 

Nominal Pipe Size (NPS) Outside Diameter (OD) Schedule 40 Wall Thickness Maximum Pressure (PSI) Schedule 80 Wall Thickness
Maximum Pressure (PSI)
1/8″ 0.405 0.068 810 0.095 1230
1/4 0.54 0.088 780 0.119 1130
3/8 0.675 0.091 620 0.126 920
1/2 0.84 0.109 600 0.147 850
3/4 1.05 0.113 480 0.154 690
1 1.315 0.133 450 0.179 630
1 1/4 1.66 0.14 370 0.191 520
1 1/2 1.9 0.145 330 0.2 470
2 2.375 0.154 280 0.218 400
2 1/2 2.875 0.203 300 0.276 420
3 3.5 0.216 260 0.3 370
3 1/2 4 0.226 240 0.318 350
4 4.5 0.237 220 0.337 320
5 5.563 0.258 190 0.375 290
6 6.625 0.28 180 0.432 280
8 8.625 0.322 160 0.5 250
10 10.75 0.365 140 0.593 230
12 12.75 0.406 130 0.687 230
14 14 0.437 130 0.75 220
16 16 0.5 130 0.843 220
18 18 0.562 130 0.937 220
20 20 0.593 120 1.031 220
24 24 0.687 120 1.218 210


What is the standard length of a PVC pipe?

All types of PVC pipes sold are 10 feet to 20 feet long. Plain end (square-cut) or bell-end.

Is PVC cheaper than wood?

PVC and other composites often cost more than wood deckings as they are high-performance products. Wood deckings vary depending on the application, but PVC is still significantly more expensive than wood.

Are PVC pipes UV resistant?

UV light radiations cause the outer part of the PVC pipe to show variations in color. However, the color change is meager and doesn’t leave and long-lasting damage to the pipe. The visible color change is called UV discoloration.

Long-term and continuous exposure to sunlight can decrease the pipe’s impact strength and resistance; however, it doesn’t impact pipes’ pressure resistance capabilities, malleability, and rigidity. Interestingly, furniture-grade PVC pipes are UV resistant and don’t exhibit any effect of sunlight.

What is the life expectancy of PVC pipes?

The life expectancy of all PVC pipes is up to 75 to 100 years.

Can CPVC catch fire?

PVC material is not considered flammable. PVC has an ignition temperature of 734 degrees Fahrenheit (390 degrees Celsius) to catch fire. Even if it catches fire, the spread will be very slow.

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The Conclusion 

That was all I wanted to say about PVC Schedule 40 VS 80. Both have their pros and cons and come with several benefits. However, their intended use is different, and it is vital to analyze the application and all the necessary parameters to figure out the best.

Thanks for reading. Kindly share your reviews in the comment section.

Have a wonderful day.

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