Share this page on

Sight Glass Manufacturers and Companies

IQS Directory provides a detailed list of sight glass manufacturers and suppliers. Find sight glass companies that can design, engineer, and manufacture sight glasses to your specifications. Peruse our website to review and discover top sight glass manufacturers with roll over ads and complete product descriptions. Connect with the sight glass companies through our hassle-free and efficient request for quote form. You are provided company profiles, website links, locations, phone numbers, product videos, and product information. Read reviews and stay informed with product new articles. Whether you are looking for manufacturers of industrial sight glass, plant sight glass, and sight glass frames of every type, IQS is the premier source for you.

Related Categories

Founded in 1950, S & S Optical Company is a leader in sight glass and other products. Their engineers are skilled in making various parts for optical, industrial, aerospace and military, marine and more applications. Supplying diverse manufacturers across the country and globe, S & S Optical is a company you can rely on for high quality products and exceptional customer service.
Read Reviews
For over forty years, Pegasus Glass has been providing quality sight glass and other parts for a wide variety of industries around the world. There zero-waste project is constantly recycling and re-using parts so that your costs can be lowered, less space is taken up in landfills and the environment can remain a little greener. For a company that cares about customers and the planet, call Pegasus.
Read Reviews
As glass manufacturers, John C. Ernst's measurement equipment can be digital or mechanical, in addition to a variety of other types for different measurements of flow. For each type, there are specific guidelines that are followed by companies like John C. Ernst to ensure proper usage. For more information, please call or go to their helpful website for full product descriptions.
Read Reviews
We carry a large range of glass products in our warehouse, ranging from glass tubes to safety glass. Our customers vary in location, and we ensure our delivery is quick and efficient. We make it our priority to ensure our customers are satisfied through every step of the process. Find out what we can do for you when you call us today!
Read Reviews
A worldwide leader in glass fabrication and the manufacture of flat glass and fiberglass insulation, Guardian Industries is your source for glass fabricating and tempered glass. We manufacture a variety of automotive exterior products, distribute building products and lead the industry in mirror production.
Read Reviews
We are a flexible manufacturer who will work with you on your time table. These solutions are affordable and made to meet your exact needs. We take pride in making the highest performance glass products possible. We pre-test all of our glass to ensure maximum levels of customer satisfaction. Please give us a call today to learn more information!
Read Reviews
More Sight Glass Companies More Sight Glass Companies
Industry Information

Sight Glass

Sight glass is used in industrial plants and machines in order to visually observe and monitor liquid and material levels, colors, flows or direction. It can be installed as the windows of a piping system, an external vacuum tube, or as a component with a frame screwed between two metal pipes. Tanks, boilers, reactors or vessels may contain components of sight glass in the form of liquid level gauges or inline sight points. Further uses include media vessels in chemical plants and in other industrial settings such as breweries, bio gas plants, pharmaceutical, food processing and beverage.

Also referred to as sight windows or sight ports, sight glass components are important for a number of reasons. For consumer and beverage industries it is necessary to ensure levels remain high. In some machines, without a specific amount of necessary liquids, the engines could seize and cause great damage; therefore it is imperative the levels are monitored to remain in a safe phase. Sight glass can come in different forms; however the most common type of sight glass is composed of a tempered glass disc between two metal frames which have been secured together allowing the operator of the equipment to determine the level of liquid contained within.

The glass used must be transparent in order for the level of liquid to be observed and therefore color additives or coatings are not typically used with sight glass. However, to ease the reading of the level, a backboard may be a component of the sight glass mechanism. Sight glass is typically manufactured as safety glass in order to prevent any pressure or tension resulting in breakage and potential physical damage to personnel working with the machinery. However, glass which has been tempered or mechanically stressed prior to installation is less likely to break and therefore it is used for sight glass to reduce the risk of explosions. The glass used for sight glass fabrication is made using soda lime or borosilicate glass. Soda lime glass tends to be more cost-effective and is a good quality material. However, when tensile strength and a lower coefficient of expansion are required in a piece of sight glass, more expensive borosilicate glass is used. It is unlikely that borosilicate glass will crack or break even when exposed to temperature changes and pressure. Sight glass can be further strengthened through the process of annealing and ion exchange chemical strengthening.


Sight Glass
Sight Glass - Pegasus Glass
Move to Top