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Dongyue Industry Co., Ltd.
Dongyue Industry Co., Ltd.  

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Reflex Gauge Glass for Observing Liquid Flow and Level 

Payment Terms: T/T 
Place of Origin: Hebei, China (Mainland) 
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Product Detail

Brand Name: Dongyue

Round sight glass, suitable to work in high temperature and pressure and aggressive medium, are widely used in industry flanges and pipes.

Round sight glass, also called round gauge glass and sight glass disc, commonly uses the material of soda-lime glass, borosilicate glass, aluminosilicate glass and quartz glass. We suggest different material according to environmental conditions, such as temperature, pressure, acid and alkali.

Soda-lime glass working temperature is up to 230 °C, but it is the most inexpensive material. Borosilicate glass is particularly used in aggressive environment, such as acid and alkali. The working temperature is up to 400 °C. Aluminosilicate glass can resist acid and alkali better than borosilicate glass and the working temperature can reach 650 °C. Quartz glass is the best material, whose working temperature can reach 1100 °C.

Round gauge glass is commonly used in industry, chemical, petrol and medicine pipes and flanges for observing the liquid flow and liquid level.


Material: soda-lime glass, borosilicate glass, aluminosilicate glass and quartz glass.

Diameter: 5-500 mm.

Thickness: 1-30 mm.


Clear round shape.

Round shape with hole in the center.

Max temperature: 1100 °C.

Max pressure: 500 bars.

Accessories: gasket and mica sheet can also be provided together.

There are many pieces of round sight glass of different material and dimension.

The round sight glass has different material and dimension according to the working environment.There is a piece of round sight glass with a hole in center.

The round sight glass can be punched holes for installment of other accessories.There are two pieces of round sight glass suitable for flanges.

Round sight glass is most commonly used in flange for observing liquid flow.

Features and advantages

Corrosion resistance 

Round sight glass has stable chemical property. It can resist acid and alkali, so that it suits to be applied in industry for long life.

High working temperature 

Soda-lime glass working temperature is up to 280 °C. Borosilicate glass max working temperature is 350 °C. Quartz glass working temperature is up to 1100 °C. Round sight glass is commonly used in industry boiler or pipes and working environment is very aggressive. So that high working temperature is important for sight glass.

High working pressure 

The highest working pressure that the round sight glass can stand is 500 bars.

High light transmittance 

Our round gauge glass has high light transmittance, which can make sure the liquid level or flow clear.

No pollution to liquid 

The glass will not pollute the water or other liquid even in very high temperature. The round sight glass is sometimes used in water tanks and no pollution is very important.


Industry, petrol, chemistry and medicine pipe.

Used in flange for observing the liquid flow or liquid level.

Package and delivery

In order to avoid breaking, reflex gauge glass is packaged in 5 layer corrugated cartons or pallet, with foam or bubble wrap.

We can also pack the reflex gauge glass according to customers' requirements.

Normally, we can deliver the goods within 20 days after receiving the down payment.

Contact us immediately if you are interested in any of our gauge glass. And you can email us at if you have any questions.

 Ms. Ella

Tel: 86-318-8166777
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Company Info

Dongyue Industry Co., Ltd. [China (Mainland)]

Business Type:Manufacturer
City: Hengshui
Province/State: Hebei
Country/Region: China (Mainland)

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