Purity Control of PEX Systems in Laboratory Gas Delivery

Maintaining high levels of purity in laboratory gas delivery systems is essential for ensuring accurate scientific results and safe operational standards. Among the various piping options available, PEX-AL-PEX piping systems have gained widespread attention due to their stability, resistance to contamination, and cost-effectiveness. These multilayer pipes, when installed using the proper PEX AL PEX tool, offer exceptional purity control, making them suitable for laboratories handling high-purity gases such as nitrogen, helium, or oxygen.

This article explores how PEX-AL-PEX systems maintain purity during gas transmission, their applications in scientific and industrial labs, and how to select and install them correctly.

Frequently Asked Questions (FAQ)

1. Can PEX-AL-PEX be used for gas delivery in laboratory environments?
Yes, PEX-AL-PEX is suitable for low-pressure laboratory gas delivery systems. It offers minimal permeability and is resistant to corrosion and contamination, which is vital in maintaining purity.

2. How does a PEX AL PEX tool work in installation?
The tool securely connects the multilayer pipe to fittings using either compression, press, or crimp technology. It ensures a tight, clean seal, which helps maintain gas purity by preventing leaks or air ingress.

3. Is PEX-AL-PEX resistant to chemical contamination?
Yes, the inner layer of PEX is non-reactive and corrosion-resistant. The aluminium core acts as a barrier to gas diffusion, which is especially useful when delivering pure gases.

4. What makes PEX-AL-PEX suitable for lab use compared to other materials?
PEX-AL-PEX has a smooth interior surface, preventing particle build-up, and is free from welding or soldering debris. It also resists microcracking and degradation under typical laboratory conditions.

5. Can PEX-AL-PEX handle high-purity applications?
For high-purity (non-ultra-pure) applications, PEX-AL-PEX performs well, especially in dry and clean environments. However, always consult lab purity standards to confirm suitability.

PEX Piping System: Definition and Core Features

PEX-AL-PEX is a multilayer piping system made from cross-linked polyethylene (PEX), an adhesive layer, an aluminium core, and a protective outer PEX layer. This composite design combines the flexibility of plastic with the structural strength of metal.

Key Features of PEX-AL-PEX:

• Barrier Layer: The aluminium core prevents gas diffusion and contamination from external sources.

• Smooth Bore: The internal PEX layer ensures low friction and minimal particulate retention.

• Pressure Resistance: Suitable for low to moderate pressure gas systems.

• Corrosion-Free: Unlike metal piping, PEX-AL-PEX does not corrode or degrade in cleanroom conditions.

• Form Stability: It holds its shape after bending, reducing the need for additional fittings.

In clean gas environments, these features are vital for maintaining consistent gas quality throughout the system.

Common Applications and Industry Usage

While PEX-AL-PEX is typically known for plumbing and heating, it is increasingly used in controlled environments, especially where gas purity and long-term stability are essential.

Common Laboratory and Industrial Applications:

• Scientific Research Labs: For delivering nitrogen, carbon dioxide, or compressed air in analytical devices.

• Chemical Testing Facilities: Where corrosion-resistant and low-contamination materials are crucial.

• Biotech and Pharmaceutical Environments: Where gas lines must not degrade or affect the outcome of sensitive processes.

• Educational Laboratories: Offering a low-cost, high-performance solution for non-critical gas supply systems.

• Food Testing Labs: Where inert gas delivery is used for preservation or analysis.

These applications benefit from the simplicity, purity, and reliability of PEX-AL-PEX, particularly when installed with a precise PEX AL PEX tool.

Buying Guide: How to Choose PEX-AL-PEX Systems for Lab Gas Use

Choosing the right PEX-AL-PEX system ensures you maintain gas purity, prevent system failure, and meet regulatory requirements.

1. Verify Material Certifications

Look for certifications such as:

• ISO 17484-1 for gas piping systems.

• WRAS for potable and clean environments.

• NSF for chemical safety.

Ensure the pipe has multilayer construction with a minimum aluminium thickness of 0.2 mm for adequate barrier protection.

2. Check Pipe Size Compatibility

Select pipe sizes (commonly 16mm, 20mm, 25mm) according to system pressure and gas flow needs. Larger systems may require thicker-walled pipes for added safety.

3. Colour Coding

• Yellow: Often used for gas systems.

• White or Natural: Ideal for lab environments to visually indicate cleanliness.

• Avoid using pipes with ink markings in visible areas within cleanrooms.

4. Select the Right PEX AL PEX Tool

A reliable installation tool is essential. Options include:

• Manual Compression Tools: For low-volume, simple connections.

• Battery-Operated Press Tools: For high-precision, repeated tasks.

• Calibration Tools: To ensure pipe ends are round before pressing.

A poorly chosen tool can result in leaks or gas purity compromise. Ensure the tool matches your chosen fitting system and pipe diameter.

Installation Considerations in Laboratory Environments

Precision installation is key in laboratory gas systems. A clean, well-sealed connection ensures no gas is lost and no contamination enters the delivery system.

1. Pre-Installation Pipe Handling

• Store PEX-AL-PEX indoors in clean, dry packaging.

• Avoid dragging pipes across dirty surfaces.

• Wear gloves when handling to avoid contaminating internal surfaces.

2. Cutting and Calibration

• Use a high-quality pipe cutter to ensure a clean, burr-free edge.

• Always use a calibration tool after cutting to return the pipe to a perfect circle.

• Avoid leaving any dust or debris inside the pipe.

3. Using the PEX AL PEX Tool

• Choose fittings compatible with your system—compression, crimp, or press.

• Insert the pipe fully into the fitting sleeve.

• Use the tool according to the manufacturer’s torque or pressing guide.

• Visually inspect the joint and test the seal before commissioning.

4. System Testing

• Conduct pressure and leak testing using inert gases before use.

• Flush the system with high-purity nitrogen to remove any trace contaminants.

Proper handling and correct use of the PEX AL PEX tool ensure a durable, clean connection—vital in any controlled lab environment.

PEX-AL-PEX vs Other Pipe Materials: Lab Suitability Comparison

PEX-AL-PEX stands out for its balance between purity, ease of use, and affordability. It provides many benefits of stainless steel without the complexity or cost, making it ideal for laboratory-scale systems.

Conclusion

Laboratory gas delivery systems demand precise control, purity assurance, and long-term reliability. PEX-AL-PEX piping systems, when properly selected and installed using a compatible PEX AL PEX tool, offer an efficient and cost-effective alternative to traditional metal piping. They reduce the risk of contamination, offer excellent resistance to corrosion, and simplify installation in controlled environments.

Whether used in scientific, pharmaceutical, or industrial laboratories, PEX-AL-PEX pipes continue to demonstrate their value in maintaining high-quality gas delivery systems. With proper tools and installation practices, labs can benefit from long-lasting, clean, and reliable performance.

Contact Us

IFAN is a Chinese manufacturer of plastic pipes, fittings, and valves with over 30 years of experience. Our range of PEX-AL-PEX systems and specialised tools is ideal for lab gas delivery, plumbing, and industrial applications.

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