A PP (Polypropylene) Sight Glass is an industrial instrument used to visually monitor the flow, level, or condition of fluids within a piping system. Because the body is made of Polypropylene, these sight glasses are specifically designed for environments where metallic components would succumb to corrosion.
Feature Typical Range / Detail
Body Material Polypropylene (PP) / Glass-reinforced PP
Viewing Material Borosilicate Glass, Acrylic, or Polycarbonate
Size Range 15mm to 300mm (1/2' to 12')
Pressure Rating Up to 10 Bar (approx. 145 PSI)
Temperature Limit Max 80°C to 90°C (176°F to 194°F)
Sealing / Gaskets EPDM, Viton, or PTFE (Teflon)
End Connections Flanged (ANSI/DIN) or Threaded (BSP/NPT)
Full-View (Tubular) Type:
Features a 360° transparent tube.
Best for checking fluid color, clarity, and the presence of bubbles from any angle.
Double Window Type:
Features a solid PP body with two opposite glass windows.
More robust for slightly higher pressure applications and easier to shield with safety guards.
Drip Tube / Flapper Type:
Includes internal indicators (like a flapper or drip tube) to help visualize low-flow or vertical downward flow.
## Primary Applications
Chemical Processing: Monitoring the movement of corrosive acids or bases.
Water Treatment: Observing chemical dosing and filtration clarity.
Fertilizer Plants: Handling aggressive liquid fertilizers.
Pharmaceuticals: Visualizing flow in pure water or solvent lines.
Food & Beverage: Checking for line drainage or product consistency.
Polypropylene Flow Indicator
Plastic Inline Sight Glass
Acid-Resistant Sight Flow
Corrosion Resistant Level Glass
Borosilicate PP Sight Glass
Flanged PP Sight Glass Valve
