low iron tempered glass Archives - Bear Glass Blog https://bearglassblog.com/tag/low-iron-tempered-glass/ Wed, 18 Feb 2026 09:40:54 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://bearglassblog.com/wp-content/uploads/2015/08/cropped-Bear_logo1-1-75x75.png low iron tempered glass Archives - Bear Glass Blog https://bearglassblog.com/tag/low-iron-tempered-glass/ 32 32 Glass Tempering By Bear Glass https://bearglassblog.com/nj-tempering-by-bear-glass/ Thu, 26 Mar 2026 19:49:00 +0000 http://bearglassblog.com/?p=1088 Overview of Tempered Glass: Tempered glass is made using special heated furnaces, which heat the annealed glass to a uniform temperature of approximately 700ºC. When the glass exits the furnace, it is rapidly cooled. This rapid cooling puts the glass surface into a state of compression while the centre core remains in tension. THERMAL TEMPERING Tempering Process:Tempered glass is made by uniformly heating annealed glass to a temperature of up to 700°C and immediately cooling it. The glass first goes through the furnace, carried in by rollers, where it is heated using three modes – conduction, convection and radiation. The rollers conduct the heat, while the coils help in the radiation of heat. The convection effect is brought about by hot air blowing through the nozzles, thus circulating the heat inside the furnace and making sure that the glass is heated evenly on all sides. This super heated glass then undergoes a rapid cooling process by a uniform and simultaneous blast of air on both surfaces. After tempering, the stress pattern developed by the glass is high, and the mechanical strength of tempered glass is four to five times higher than that of annealed glass. Mechanical Strength of Tempered Glass = 4 x Mechanical strength of Annealed Glass When tempered glass is broken, all the stored energy is released at once and the glass breaks into small pieces. Characteristics of Tempered glass: Tempered glass is four to five times stronger than annealed glass of the same size and thickness against impact. Tempered glass has higher thermal strength, and it can withstand high temperature changes up to 250°C. Tempered glass is considered as safety glass. It is difficult to break and even in the event of a breakage, disintegrates into small relatively harmless globules. Tempering does not alter the basic characteristics of glass such as light transmission and solar radiant heat properties of normal glass. The glass surface after heat treatment has the same resistance to surface damage as annealed glass. Tempered glass cannot be cut or altered. One problem that can also exist with tempered glass is spontaneous breakage, where the glass can break for no apparent reason. Spontaneous breakage occurs when nickel sulphide stones increase in size due to repeated heating and cooling. Properties of Tempered Glass: Properties Tempered Glass Thermal Shock Resistance Up to 250°C Mechanical Strength Four to five times stronger thanannealed glass Tensile Strength 65 MPa Bending Strength 120-200 N/mm2 Surface Compression > 95 MPa Design Stress for Architectural Purposes 50 MPa Fragmentation Small round crystals Conducive for Processing Cannot be cut after Tempering Need for Tempered Glass:Tempering increases tensile strength, thermal shock resistance, and safety of normal glass. It also increases its heat withstanding capacity. Because of these properties, tempered glass is preferred in applications where strength, safety and thermal resistance are important considerations. Strength & Safety Considerations Four to five times stronger than annealed glass Two to three times stronger than heat strengthened glass Fragments into small, relatively harmless pieces, reducing the likelihood of injury. Heat resistance Withstands both uneven heating and high temperatures due to its superior edge strength compared to normal annealed glass. Because of its high edge strength tempered glass is used in spider and point fixed glazing. Thermal Breakage:Uneven heating due to direct sunlight makes glass expand and contract at different rates. This difference in the rates of expansion (central part of glass) and contraction (edges of glass) create stresses in glass which may lead to breakage. When temperature difference is below 32°C, the risk of thermal breakage is low, but when the difference becomes more than this, the risk increases significantly. Thermal breakage starts at the edge and is perpendicular to the glass edge. Breakage may be single or multiple depending on the built up stress. Several cracks indicate high thermal stresses across the glass pane. A fully tempered glass has significantly higher edge strength to withstand chances of thermal breakage. Application of Tempered Glass: Tempered glass is specifically designed for use in areas where there is a high risk of contact and breakage. It is not harder or softer than annealed glass but is tougher. Tempering does not make glass more porous nor is tempered glass more prone to scratches than normal glass. Tempered glass offers a wide variety of uses in industries including building, manufacturing, automotive, to name a few. There is a wide scope for the use of tempered glass in the building industry. It can be used to raise the elemental beauty of exteriors and interiors by using it on facades, showroom shelves, dividers, shower cabins, doors and the like. High resistance to thermal stress and small missile impact makes tempered glass an ideal choice for sloped glazing. The manufacturing industry uses tempered glass in ovens, refrigerators, fireplace screens, and shelves. In the motor vehicle industry, tempered glass is commonly used inside and rear windows. To know more about this glass product, contact Bear Glass now!

The post Glass Tempering By Bear Glass appeared first on Bear Glass Blog.

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Overview of Tempered Glass:

Tempered glass is made using special heated furnaces, which heat the annealed glass to a uniform temperature of approximately 700ºC. When the glass exits the furnace, it is rapidly cooled. This rapid cooling puts the glass surface into a state of compression while the centre core remains in tension.

THERMAL TEMPERING

Tempering Process:
Tempered glass is made by uniformly heating annealed glass to a temperature of up to 700°C and immediately cooling it. The glass first goes through the furnace, carried in by rollers, where it is heated using three modes – conduction, convection and radiation. The rollers conduct the heat, while the coils help in the radiation of heat. The convection effect is brought about by hot air blowing through the nozzles, thus circulating the heat inside the furnace and making sure that the glass is heated evenly on all sides. This super heated glass then undergoes a rapid cooling process by a uniform and simultaneous blast of air on both surfaces.


After tempering, the stress pattern developed by the glass is high, and the mechanical strength of tempered glass is four to five times higher than that of annealed glass.

Mechanical Strength of Tempered Glass = 4 x Mechanical strength of Annealed Glass

When tempered glass is broken, all the stored energy is released at once and the glass breaks into small pieces.

Characteristics of Tempered glass:

Tempered glass is four to five times stronger than annealed glass of the same size and thickness against impact.

Tempered glass has higher thermal strength, and it can withstand high temperature changes up to 250°C.

Tempered glass is considered as safety glass. It is difficult to break and even in the event of a breakage, disintegrates into small relatively harmless globules.

Tempering does not alter the basic characteristics of glass such as light transmission and solar radiant heat properties of normal glass.

The glass surface after heat treatment has the same resistance to surface damage as annealed glass.

Tempered glass cannot be cut or altered.

One problem that can also exist with tempered glass is spontaneous breakage, where the glass can break for no apparent reason. Spontaneous breakage occurs when nickel sulphide stones increase in size due to repeated heating and cooling.

Properties of Tempered Glass:








































PropertiesTempered Glass
Thermal Shock ResistanceUp to 250°C
Mechanical StrengthFour to five times stronger than
annealed glass
Tensile Strength65 MPa
Bending Strength120-200 N/mm2
Surface Compression> 95 MPa
Design Stress for Architectural Purposes50 MPa
FragmentationSmall round crystals
Conducive for ProcessingCannot be cut after Tempering

Need for Tempered Glass:
Tempering increases tensile strength, thermal shock resistance, and safety of normal glass. It also increases its heat withstanding capacity. Because of these properties, tempered glass is preferred in applications where strength, safety and thermal resistance are important considerations.


  • Strength & Safety Considerations

    • Four to five times stronger than annealed glass

    • Two to three times stronger than heat strengthened glass

    • Fragments into small, relatively harmless pieces, reducing the likelihood of injury.



  • Heat resistance

    • Withstands both uneven heating and high temperatures due to its superior edge strength compared to normal annealed glass. Because of its high edge strength tempered glass is used in spider and point fixed glazing.

Thermal Breakage:
Uneven heating due to direct sunlight makes glass expand and contract at different rates. This difference in the rates of expansion (central part of glass) and contraction (edges of glass) create stresses in glass which may lead to breakage. When temperature difference is below 32°C, the risk of thermal breakage is low, but when the difference becomes more than this, the risk increases significantly.

Thermal breakage starts at the edge and is perpendicular to the glass edge. Breakage may be single or multiple depending on the built up stress. Several cracks indicate high thermal stresses across the glass pane. A fully tempered glass has significantly higher edge strength to withstand chances of thermal breakage.

Application of Tempered Glass:

Tempered glass is specifically designed for use in areas where there is a high risk of contact and breakage. It is not harder or softer than annealed glass but is tougher. Tempering does not make glass more porous nor is tempered glass more prone to scratches than normal glass. Tempered glass offers a wide variety of uses in industries including building, manufacturing, automotive, to name a few.

There is a wide scope for the use of tempered glass in the building industry. It can be used to raise the elemental beauty of exteriors and interiors by using it on facades, showroom shelves, dividers, shower cabins, doors and the like.

High resistance to thermal stress and small missile impact makes tempered glass an ideal choice for sloped glazing.

The manufacturing industry uses tempered glass in ovens, refrigerators, fireplace screens, and shelves.

In the motor vehicle industry, tempered glass is commonly used inside and rear windows.

To know more about this glass product, contact Bear Glass now!

The post Glass Tempering By Bear Glass appeared first on Bear Glass Blog.

]]> Bear Glass brings Pilkington Optiwhite™ Glass To Our Valued Customers https://bearglassblog.com/pilkington-optiwhitetm-glass/ Tue, 22 Oct 2013 15:23:16 +0000 http://bearglassblog.com/?p=2138 Bear Glass is proud to offer Pilkington Optiwhite™ Low Iron Float Glass. We feel that by offering this product line we are able to offer the clear choice when it comes to colorless float glass.Why do we say this?Pilkington Optiwhite Float Glass virtually eliminates the green cast inherent in standard float glass, particularly noticeable in thicker glasses.When true color is of paramount importance, Pilkington Optiwhite™ Float Glass is the perfect solution. Noticeably clearer than standard clear float glass, the colorlessness of Optiwhite Float Glass is especially apparent when it is combined with white or light colors, and when exposed, polished edges are in view. As a result, Optiwhite Glass offers enhanced clarity and aesthetics for everything from photovoltaic modules and solar collectors to showroom and furniture applications. It is also ideal for glass which is to be ceramically decorated, because the true colors of the decorations will show through the glass. Product Features • PRACTICALLY COLORLESS, thanks to its low iron content, Optiwhite Float Glass virtually eliminates the green cast inherent in standard clear float, which is especially noticeable on exposed, polished edges. It also allows the true color of ceramic decoration to show through. • UNLIMITED VERSATILITY and the absence of color make Optiwhite Glass ideal for applications such as security glazing laminates, I.G. units, photovoltaic modules, solar collectors, projection room windows, storefronts, appliances, shelving, display cases, zoo and aquarium enclosures, and tabletops. • IMPROVED LIGHT TRANSMITTANCE makes this product ideal for applications which can benefit from more light. Compared to standard clear float, visible light transmittance for Optiwhite Glass is 2% higher in an 1/8 For more information on Bear Glass and our line of  Pilkington Optiwhite™ Glass. please contact Bear Glass at: FACTORY/ OFFICE Address: Bear Glass Inc. 399 20th Street Brooklyn, NY 11215 Phone: 718-832-3604 Fax: 718-832-0786 E-mail: bearglass@yahoo.com If you are in New Jersey: Bear Glass New Jersey 359 Essex Road Tinton Falls New Jersey  07753 P: 732 901 262

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Bear Glass is proud to offer Pilkington Optiwhite™ Low Iron Float Glass. We feel that by offering this product line we are able to offer the clear choice when it comes to colorless float glass.Why do we say this?Pilkington Optiwhite Float Glass virtually eliminates the green cast inherent in standard float glass, particularly noticeable in thicker glasses.When true color is of paramount importance, Pilkington Optiwhite™ Float Glass is the perfect solution.

Noticeably clearer than standard clear float glass, the colorlessness of Optiwhite Float Glass is especially apparent when it is combined with white or light colors, and when exposed, polished edges are in view.

As a result, Optiwhite Glass offers enhanced clarity and aesthetics for everything from photovoltaic modules and solar collectors to showroom and furniture applications. It is also ideal for glass which is to be ceramically decorated, because the true colors of the decorations will show through the glass.

Product Features

• PRACTICALLY COLORLESS, thanks to its low iron content, Optiwhite Float Glass virtually eliminates the green cast inherent in standard clear float, which is especially noticeable on exposed, polished edges. It also allows the true color of ceramic decoration to show through.

• UNLIMITED VERSATILITY and the absence of color make Optiwhite Glass ideal for applications such as security glazing laminates, I.G. units, photovoltaic modules, solar collectors, projection room windows, storefronts, appliances, shelving, display cases, zoo and aquarium enclosures, and tabletops.

• IMPROVED LIGHT TRANSMITTANCE makes this product ideal for applications which can benefit from more light. Compared to standard clear float, visible light transmittance for Optiwhite Glass is 2% higher in an 1/8

For more information on Bear Glass and our line of  Pilkington Optiwhite™ Glass. please contact Bear Glass at:

FACTORY/ OFFICE

Address:

Bear Glass Inc.

399 20th Street

Brooklyn, NY 11215

Phone: 718-832-3604

Fax: 718-832-0786

E-mail: bearglass@yahoo.com

If you are in New Jersey:

Bear Glass New Jersey

359 Essex Road

Tinton Falls New Jersey  07753

P: 732 901 262

The post Bear Glass brings Pilkington Optiwhite™ Glass To Our Valued Customers appeared first on Bear Glass Blog.

]]> Bear Glass Sells Wholesale Low Iron Glass https://bearglassblog.com/bear-glass-sells-wholesale-low-iron-glass/ Fri, 27 May 2011 18:30:20 +0000 http://bearglassblog.com/?p=544 Bear Glass specializes and is a leader in low iron glass. Low iron glass is ultra clear and provides a higher degree of transparency compared to clear float glass. This optimum clarity is achieved by removing most of the iron oxide content used to produce glass. The virtual absence of color makes low iron glass the natural choice when neutral color and clarity count. Low iron glass belongs to a group of extremely clear glass with minimal green cast. High light transmission and brilliant surfaces make this glass ideal for colored glass applications, frame-less glass installations such as shower doors, glass doors and glass table tops. Low iron glass utilizes a raw material formula that increases light transmission and neutrality while reducing the greenish tint in clear glass that is most apparent when viewed from the edge. The result is pure, sparkling and very clear glass. Low Iron glass is a high quality and ultra clear float glass, also called extra clear glass. The transparency of low iron glass can reach 91%. Low iron glass also can be done different deep processes same as float glass, such as, tempered, curved, laminated, insulated, and so on. Low Iron glass is mainly used for photo electricity conversion, solar energy, top-grade buildings, decorative glass, top-grade furniture, imitating crystal product, special type buildings, and so on. Bear Glass can assist you in using low iron glass for your decorative needs throughout your home or any commercial building. Properties of low iron glass include high clarity and transparency, low iron oxide content, and not green tint that is inherent in normal float glass. One of the most prominent places that low iron glass is useful is in glass shower doors.  Bear Glass has a wide range of variety in the field of low iron glass for this usage. Another usage of low iron glass is with energy based applications.  Solar panels are ideal for this type of glass.  The ultra pure sunlight that can be used by low iron glass is above all others for this necessity. More and more uses for low iron glass are constantly trending.  One of the biggest right now is low iron glass used for aquariums and all types of fish tanks.  This is due to low iron glass being extremely clear and transparent. Bear Glass recommends using low iron glass for other applications such as shelving, laminated glass, greenhouses, tabletops, furniture, decorative glass, and appliances. We ship Low Iron Glass world wide. For more information, please contact us at: FACTORY/OFFICE Address: Bear Glass Inc. 217-44 98th Ave. Queens Village, NY – 11429United States Phone: 718-832-3604 Fax: 718-832-0786 Email: sales@bearglass.com

The post Bear Glass Sells Wholesale Low Iron Glass appeared first on Bear Glass Blog.

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Bear Glass specializes and is a leader in low iron glass.

Low iron glass is ultra clear and provides a higher degree of transparency compared to clear float glass. This optimum clarity is achieved by removing most of the iron oxide content used to produce glass.

The virtual absence of color makes low iron glass the natural choice when neutral color and clarity count.

Low iron glass belongs to a group of extremely clear glass with minimal green cast. High light transmission and brilliant surfaces make this glass ideal for colored glass applications, frame-less glass installations such as shower doors, glass doors and glass table tops. Low iron glass utilizes a raw material formula that increases light transmission and neutrality while reducing the greenish tint in clear glass that is most apparent when viewed from the edge. The result is pure, sparkling and very clear glass.

Low Iron glass is a high quality and ultra clear float glass, also called extra clear glass. The transparency of low iron glass can reach 91%. Low iron glass also can be done different deep processes same as float glass, such as, tempered, curved, laminated, insulated, and so on. Low Iron glass is mainly used for photo electricity conversion, solar energy, top-grade buildings, decorative glass, top-grade furniture, imitating crystal product, special type buildings, and so on.

Bear Glass can assist you in using low iron glass for your decorative needs throughout your home or any commercial building.

Properties of low iron glass include high clarity and transparency, low iron oxide content, and not green tint that is inherent in normal float glass.

One of the most prominent places that low iron glass is useful is in glass shower doors.  Bear Glass has a wide range of variety in the field of low iron glass for this usage.

Another usage of low iron glass is with energy based applications.  Solar panels are ideal for this type of glass.  The ultra pure sunlight that can be used by low iron glass is above all others for this necessity.

More and more uses for low iron glass are constantly trending.  One of the biggest right now is low iron glass used for aquariums and all types of fish tanks.  This is due to low iron glass being extremely clear and transparent.

Bear Glass recommends using low iron glass for other applications such as shelving, laminated glass, greenhouses, tabletops, furniture, decorative glass, and appliances.

We ship Low Iron Glass world wide.

For more information, please contact us at:

FACTORY/OFFICE

Address:

Bear Glass Inc.

217-44 98th Ave. Queens Village, NY – 11429
United States

Phone: 718-832-3604

Fax: 718-832-0786

Email: sales@bearglass.com

The post Bear Glass Sells Wholesale Low Iron Glass appeared first on Bear Glass Blog.

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