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What is the Difference Between SCH 40 and SCH 80?

When it comes to selecting the right fittings for your piping system, understanding the differences between uPVC Schedule 40 and Schedule 80 fittings is crucial. Both types of fittings have unique characteristics that make them suitable for different applications. In this blog, we’ll explore these differences, their relationship, and how to choose the best option for your needs.

The main difference between UPVC SCH 40 and SCH 80 uPVC fittings is their wall thickness and pressure rating. UPVC SCH 40 fittings are white in colour and have thinner walls than Sch80 and are suitable for low pressure applications, whereas SCH 80 fittings are dark grey in colour and have thicker walls than UPVC SCH 40, making them ideal for high pressure systems.

Both uPVC Schedule 40 and Schedule 80 fittings are made from unplasticized polyvinyl chloride (uPVC), a durable, rigid plastic known for its resistance to corrosion, chemicals, and UV radiation. This makes them ideal for a variety of environments and applications.

What are SCH 40 and SCH 80 uPVC fittings?

SCH 40 and SCH 80 refer to the wall thickness and pressure ratings of uPVC fittings. SCH 40 fittings are commonly used in residential plumbing and irrigation systems due to their lighter weight and lower pressure capacity. On the other hand, SCH 80 fittings are designed for industrial and commercial applications where higher pressure tolerance is required.

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Table of Contents

Why does wall thickness matter?

The wall thickness of uPVC fittings directly impacts their durability and pressure-handling capacity. Thicker walls in SCH 80 fittings provide better resistance to mechanical stress and higher internal pressure, making them suitable for demanding environments. Conversely, the thinner walls of SCH 40 fittings are sufficient for less intensive applications but are not recommended for high-pressure scenarios.

How do pressure ratings differ?

Pressure rating is a crucial factor in selecting the right uPVC fittings. SCH 40 fittings typically have a pressure rating of around 450 psi, suitable for standard plumbing needs. In contrast, SCH 80 fittings can handle up to 630 psi, making them ideal for heavy-duty industrial systems where higher pressure is a factor.

What are the cost implications?

Cost is always a consideration in procurement. SCH 80 fittings are generally more expensive due to their enhanced durability and pressure rating. However, the higher initial investment can lead to long-term savings by reducing maintenance costs and avoiding system failures. SCH 40 fittings, while cheaper upfront, may incur higher costs over time if used in inappropriate applications.

Which applications are best suited for SCH 40 and SCH 80?

Choosing the right fitting depends on the specific needs of your project. The relatively thin wall thickness of UPVC SCH 40 is well suited for domestic plumbing, irrigation and other low-pressure systems. The thicker wall thickness of UPVC SCH 80 is better suited for industrial applications, chemical processing and high-pressure systems.

What is the difference in color and appearance between UPVC sch40 and UPVC sch80?

UPVC Schedule 40 Fittings: Typically white or light gray, and lighter in weight, making them easier to handle and install. UPVC Schedule 80 Fittings: Usually dark gray, heavier, and more robust, which can affect handling and installation.

Despite their differences in wall thickness and pressure ratings, Schedule 40 and Schedule 80 fittings share many similarities. Both types adhere to standardized dimensions, allowing for compatibility within the same piping systems. This means you can use Schedule 40 pipes with Schedule 80 fittings or vice versa, provided the pressure requirements of the system are met.
The installation process for both types of fittings is similar, involving cutting, deburring, and solvent welding to ensure a secure and leak-free connection.

Understanding the differences between uPVC Schedule 40 and Schedule 80 fittings helps you make informed decisions for your piping systems. Both types offer unique advantages suited to different applications, ensuring safety, efficiency, and cost-effectiveness in your projects. Whether you need the lighter, economical option of Schedule 40 or the heavy-duty reliability of Schedule 80, knowing these distinctions will guide you to the best choice for your needs. If you have any further questions or need personalized advice, feel free to reach out to our team at SWD. We’re here to help you make the best choices for your business.

     I am the author of this article and the CEO and Marketing Director of SWDPLASTIC with 15 years of experience in the valve and pipeline industry. If you have any questions, you can contact me anytime.

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