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Tempered Glass

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Although it looks indistinguishable from normal glass, tempered glass is four to five times stronger than standard float glass. Read More…

Tempered Glass Tempered glass, also called toughened glass, is a type of safety glass that is used when human security is a concern.
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Leading Manufacturers

New Haven, IN  |  260-749-9614

S & S Optical has been leaders as glass fabricators in a variety of industries and markets for over 50 years. We offer a variety of different glasses to fit all of your needs. Also, we have a multitude of capabilities and services to offer-polishing, grinding, edging and more. To learn how we can fabricate your parts contact us today for a quote. We care about customers and quality service.

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S & S Optical Company, Inc. $$$

Cambridge, ON  |  800-315-0387

Glass cutting is a varied industry, and we have done it all for the past 50 years. We believe in manufacturing high quality glass products that will exceed customer expectations every time.

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Pegasus Glass $$$

Painesville Township, OH  |  440-639-6399

Founded in 1990, Technical Glass Products is a fabricator of Fused Quartz Glassware. We maintain a broad inventory of labware, flat stock, rod and tubes in addition to providing custom fabrication using state of the art equipment to suit your needs.

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Technical Glass Products, Inc. $$$

Quakertown, PA  |  215-536-3500

Established in 1947, we have been providing glass cutting using very precise tolerances in order to ensure that our products are among the best. Our skilled designers and technicians are available around the clock in order to work with you from design to delivery to ensure that you are receiving a product that will fit your needs perfectly! For more information on what we may be able to do for you, visit our website today!

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Insaco Inc. $$$

Santa Ana, CA  |  714-545-6684

Since 1967, Mark Optics has specialized in quality glass fabrication and fused silica substrates. We specialize in precision flat optical components and ultra-thin wafers. Our capabilities include lapping, precision polishing, CNC shaping and much more.

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Mark Optics Incorporated $$$
placeholder image S & S Optical Company, Inc. Pegasus Glass Technical Glass Products, Inc. Insaco Inc. Mark Optics Incorporated

Tempered glass is produced by a heat treatment process that balances the center and outer stresses of the glass and changes the internal structure of the particles. If tempered glass is broken, it will instantly shatter into small, relatively harmless thumbnail sized pebbles, instead of sharp, jagged shards, which could seriously injure a person. Tempered glass is widely used within the construction, automotive, electronic and kitchen appliance industries.

Storm doors, window panes, glass in building entrances, shower doors, sliding doors, coffee maker carafes, oven windows, tableware, computer screens, cell phone screens, diving masks and microwave oven screens are all made of tempered glass, as they are often used and surrounded by human activity. Building codes often require public buildings to use tempered glass in construction of their windows or decorative features.

Tempered glass breaks at about 24 thousand psi, but shattering will still occur at that point. One downside of tempered glass is the tendency to shatter without warning if a small knick occurs. Instead of partially breaking or becoming shards that stay in place, tempered glass explodes into thousands of small pieces instantly, even if a small section of the glass pane breaks.

Many glass fabricators temper glass through a process involving extreme heating and rapid cooling. First, a pane of standard glass is cut, washed, sanded and inspected, because after glass has been tempered, any altering to its shape will result in shattering. Then the glass is heated to 620º C in a tempering oven for a short time. When it exits the oven, the glass is promptly quenched with high pressure blasts of cold air.

This cooling process reduces the temperature of the glass' exterior, while the center remains heated. Therefore, the center remains in tension while the outer goes into compression, thus balancing out the glass tension and significantly increasing the force required to shatter the glass. Although tempered glass is much stronger than normal glass, it is used only for the rear and side windows in cars.

The front windshield is typically made of laminated glass and composed of 2 outer layers of glass and an inner layer of transparent vinyl. If broken, the glass will cling to the vinyl instead of falling onto passengers. Coatings and laminates are sometimes applied to prevent scratching.

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