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Plastic Sight Glass (UPVC、 CPVC、 PPH 、PVDF)

Size:20-200mm or 1/2-8inch

Body Material: UPVC, CPVC, PPH, PVDF, Glass

Bolt Material: 304 stainless steel 

Connection: Flange

Washers : EPDM /FPM

Package: Cartons Box

Moq: 10 Cartons

Port: Ningbo or Shanghai

Products Description

High quality and transparent sight glass

Sight glasses are critical components in industrial systems, allowing for the visual inspection of fluid flow within pipelines. They provide operators with essential data regarding the presence, color, and consistency of the fluid, ensuring that processes are functioning correctly and efficiently. Below is a detailed overview of various types of sight glasses, including those made from uPVC, CPVC, PPH, and PVDF, highlighting their unique features, applications, and advantages.

Key Features

Sight glasses made from uPVC, CPVC, PPH, and PVDF share a range of beneficial properties tailored to different industrial needs:

  • Chemical Resistance:

    • uPVC and CPVC: These materials offer excellent resistance to a broad range of chemicals, including acids and alkalis, with CPVC providing superior resistance to stronger chemicals.
    • PPH and PVDF: PPH is highly resistant to aggressive chemicals, while PVDF excels in resisting a wide array of harsh chemicals including strong acids and solvents.
  • Temperature Tolerance:

    • uPVC: Suitable for applications with temperatures up to 60°C (140°F).
    • CPVC: Can handle higher temperatures up to 93°C (200°F), making it more versatile.
    • PPH: Capable of withstanding temperatures up to 90°C (194°F).
    • PVDF: Offers the highest thermal stability, enduring temperatures up to 150°C (302°F).
  • Durability and Mechanical Strength:

    • All four materials—uPVC, CPVC, PPH, and PVDF—provide robust mechanical strength, ensuring resistance to impact, stress, and pressure variations. This guarantees long-term durability under harsh conditions.
  • Transparency and Clarity:

    • They all offer clear visibility for monitoring fluid flow, though PVDF stands out for maintaining high clarity even under rigorous conditions.
  • Lightweight and Low Maintenance:

    • These sight glasses are lightweight, facilitating easier handling and installation compared to metal alternatives. They also require minimal maintenance due to their resistance to corrosion and degradation.
  • Cost-Effectiveness:

    • uPVC and CPVC are generally more affordable, providing cost-effective solutions for many applications. PPH and PVDF, while more expensive, offer enhanced performance in specific demanding environments.


  • Chemical Processing:

    • uPVC, CPVC, PPH, and PVDF: All materials are suitable for inspecting fluid flow in chemical processing, with CPVC and PVDF particularly suited for environments involving highly corrosive substances and high temperatures.
  • Water and Wastewater Treatment:

    • All four materials can be used in water treatment facilities, with PVDF and PPH being preferred for applications involving higher temperatures or more aggressive chemical conditions.
  • Food and Beverage Industry:

    • These materials are ideal for monitoring non-reactive fluids in food processing, with CPVC and PVDF being preferred in environments requiring high-temperature tolerance and resistance to aggressive cleaning agents.
  • Pharmaceutical and Biotechnology:

    • CPVC and PVDF are favored for their higher temperature tolerance and chemical resistance, essential for high-purity environments and stringent process monitoring.
  • Agriculture and Swimming Pools:

    • uPVC is commonly used for its cost-effectiveness and adequate performance in monitoring water flow in irrigation systems and pool filtration setups.

Each material—uPVC, CPVC, PPH, and PVDF—provides unique advantages that cater to specific industrial applications, allowing for optimal performance based on the chemical environment, temperature requirements, and durability needs. By understanding these properties, industries can select the appropriate sight glass material to ensure reliable and efficient fluid monitoring.

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