The Strongest PVC Pipe: Schedule 40 vs 80

Home \ Blog \ Water Systems \
The Strongest PVC Pipe: Schedule 40 vs 80

Which PVC pipe is strongest?

Polyvinyl chloride (PVC) pipes provide the optimal performance, versatility, durability, and affordability for your plumbing and ventilation needs. However, you could feel perplexed by the numerous numbers and sizes as you go down the pipe aisle at your neighborhood hardware store. Fortunately, learning about the various PVC pipe kinds and sizes only takes a little while.For more information on PVC Pipes, read our explanation in 500 words.

Schedule 40 vs Schedule 80

You might have come upon the word “schedule” while looking for PVC. Schedule has nothing to do with time, despite its misleading name. The schedule of a PVC pipe depends on the thickness of its walls. You may be aware that schedule 80 pipe costs a little more than schedule 40.

Schedule 80 pipe has thicker walls despite having the same exterior diameter as schedule 40 pipe. This pipe measurement standard was developed in response to the requirement for an international terminology for PVC. Due to the fact that various wall thicknesses are advantageous in various circumstances, the ASTM (American Society for Testing and Materials) developed the schedule 40 and 80 system to categorize the two popular varieties.

Water Pressure

PVC in schedules 40 and 80 are both frequently utilized worldwide. Every one has advantages in various applications. Due to its thinner walls, schedule 40 pipe is ideal for uses with relatively low water pressure.

The walls of schedule 80 pipe are thicker and can bear greater PSI (pounds per square inch). It is hence perfect for chemical and industrial applications. To illustrate the size difference, 1″ schedule 40 PVC pipe has a minimum wall thickness of.133″ and 450 PSI, whereas schedule 80 has a minimum wall thickness of.179″ and 630 PSI.

Sizing & Diameter

Schedule 80 and schedule 40 PVC pipe share the same outer diameter, as was previously mentioned. Due to schedule 80’s greater wall thickness being on the interior of the pipe, this is possible. Even while schedule 80 pipe may have a comparable schedule 40 pipe’s pipe diameter, it will therefore have a little more constrained flow. This proves that schedule 40 and schedule 80 pipe can be used in combination if necessary.

Just make sure the lower pressure handling schedule 40 parts can handle the pressure demands of your application. Since your pipe line is only as strong as its weakest joint or component, even one schedule 40 part utilized in a schedule 80 line with higher pressure might result in significant harm.

Which type do I need?

What schedule PVC do you therefore require? Schedule 40 PVC is most likely the best option if you intend to embark on a home improvement or irrigation project. Even schedule 40 PVC can withstand impressive pressure, making it more than sufficient for any purpose in the home.

Sticking with schedule 40 will also help you save some money, particularly if you want to use large diameter parts. Use schedule 80 if your employment will mostly include working with chemicals or in an industrial setting. Thicker walls are essential since these applications are likely to subject the material to greater strain and stress.

Related: Plumbing Maintenance: How Often?

Plumbing Service Areas

Port Adelaide Enfield
See All Suburbs

Plumbing Services in

Our experienced plumbers in Adelaide, SA can service the entire region, 24 hours a day, 7 days a week.

Greater Adelaide



Port Adelaide Enfield

Charles Sturt


Mount Barker

And much more!


Matt is definitely one of the best plumbers in Adelaide. When you can solve a myriad of problems with one phone call, who wouldn’t you want it? Royal Flush Plumbing does all that and more. And that’s guaranteed.
Luis M., Alberton
Promina Inc
I’d just like to send a little thank you note. After months of a variety of plumbing problems, you saved my pipes. After the team you sent was done with their work, sure enough, my drains were draining perfectly. I’m very grateful and I’ll certainly be recommending your plumbing services to my friends!
Helen A., Highbury
Promina Inc
Here’s my honest feedback; Royal Flush Plumbing has saved me thousands of dollars in repair costs in my business. Water from the sink and toilets is no longer leaking and is holding up well.

Geoff S., Royal Park
Promina Inc
Very honest and professional service at a great price. Matt and the team were called to fix another plumbers dodgy (& expensive) job and completed on time with minimal fuss. Would definitely go directly to Matt first and would recommend others to do too – you wont be disappointed!
Aaron Mohtar
Promina Inc
Royal Flush is far more than a plumbing service and repair company, they are people that care.
They care about the well-being of my business and family home. The professionalism and high quality of work is the best I’ve seen...

Andrew Fantasia
Promina Inc
I have used Royal Flush plumbing on three separate occasions at various premises. They have been professional, responsive and thorough on each occasion and leave the jobsite tidy and clean. I would highly recommend Matt and his team. Well done guys.
David Neilson
Promina Inc
Matt and his boys did the fabulous job for my backyard plumbing. They are so professional and nice team. The job has been done promptly and efficiently. I love the way they worked and keep the site tidy and organized. I have recommended them to all of my friends. Good job, boys, the most trusty plumbing team forever!!!
Harvey Wang
Promina Inc
Friendly, honest and absolutely a pleasure to deal with. We had a leak in the ceiling from a bathroom upstairs and we received great advice and service. The team knew exactly what the issue was and was able to sort us out quickly. I highly recommend Royal Flush Plumbing and will use them again. Thanks!
Dillon Chang
Promina Inc
I had issues with my toilet drain blocking up at my place of business, Royal Flush came out and saved the day on a Sunday morning before an event I had planned Later on in the evening. I had a chat to Matt about renovating the toilet and adding on an additional toilet and a new shower/bathroom and to my amazement he made this happen and I couldn’t be happier. Royal Flush, nit only provided the plumbing removal and install of this little project….
Phuc Nguyen
Promina Inc


job completed


happy clients


hours /project






Every single one of Royal Flush plumbing licensed plumbers are skilled with a variety of services, ranging from emergency hot water repairs and blocked drains, to leak detection and gas heater services. Additionally, they will arrive fully outfitted with the most cutting-edge equipment to guarantee that the service is done properly and swiftly.

Plumbing & Gas Fitting License No #PGE263618

Royal Flush Plumbing Adelaide PTY LTD © 2023