Annealed glass is heat strengthened so that it can tolerate more rapid and uneven temperature swings during its service life, for instance where the glass is backed with insulation, backpainted, is in the presence of certain lowe. Tempered glass columbia commercial building products. There are two different types of heattreated glasses, heatstrengthened and. The color, clarity, chemical composition and light transmission characteristics of glass remain unchanged. Even though it is stronger than annealed glass, you still must be careful where this glass is used. This glass thickness is the minimum available in pgt products. Laminated glass with heat strengthened glass substrates. Twice as strong as annealed glass from the same thickness. Annealed glass, heat strengthened glass, tempered glass. Heatstrengthened glass heatstrengthened glass is approximately twice as strong as annealed glass of similar thickness and fractures in a manner similar to annealed glass and tends to remain in the opening when broken.
When it breaks, heatstrengthened glass fractures into large, jagged pieces similar to annealed glass. Each type of glass has its own characteristics such as strength, breakage pattern and cost. Made with latest hightech machineries, our quality assured products include tempered glass, heat strengthened glass, laminated glass and silk screen toughen glass. Heat strengthened laminated glass provides an opportunity to offer larger window sizes to meet wind load requirements without the necessity of using thicker annealed glass. Chair rail a fixed glazing bar or rigid push bar in a glazed window door or clear of the glazing.
Hs glass must achieve residual surface compression between 3,500 and 7,500 psi for 6mm glass, according to astm c 1048. Raw glass that has not been heat treated is annealed glass. There are two types of heattreated glass, heatstrengthened and fully heat tempered. Pilkington heat strengthened glass is not a safety glass and it is approximately twice as strong as annealed glass of similar thickness. Heat strengthened glass is a semitempered glass which retains the normal properties of an ordinary float glass. The basics on annealed, heat strengthened and tempered glass.
Additional glass performance options include smartsun glass that blocks 95% of the suns harmful uv rays and passivesun glass that brings the heat from sunlight into your home. Some of the offerings may be annealed, some may be heat strengthened, and some may be tempered. Heat strengthened glass is a semi tempered glass, which has been strengthened thermally by. Heat strengthened glass has a lower residual stress and is only 2 times stronger than ordinary glass. For heat strengthened glass, the requirement is a surface compression of 3,500 to 7,500 psi with no requirement for edge compression. The glass panes can be basic float glass or tempered or heat strengthened panel.
It also includes glass that is manufactured for strength or fire resistance. Laminated glass is two or more panes of glass with one or more layers of polyvinyl butyral pvb sandwiched between them and treated. Tempafloat hs is thermally heat strengthened glass manufactured by metro glasstech the heat strengthening process is similar to that of toughened glass but with lower levels of surface compression, resulting from a lower cooling quench. Tempered glass is also used in buildings for unframed assemblies such as frameless glass doors, structurally loaded applications, and any other application that would become dangerous in the event of human impact. Heat strengthened glass is available in thickness ranging from 3 mm to.
Heatstrengthened glass glass, which has been subjected to special heat. Heatstrengthened glass generally fractures in a manner similar to annealed glass. Making glass stronger two types of safety glass are heat strengthened and tempered. Glass is not classified as a safety glazing material. There are 2 different types of impact glass to choose from. Heatstrengthened glass is a semitempered glass which retains the normal properties of an ordinary float glass. Heat strengthened glass should not be mistaken for a safety glazing product and therefore not meant for use where safety glazing is required. The following chart lists the industry standards and specifications that apply to glass used in windows, doors, skylights and architectural glazing applications. The most common types of basic glass treatments include annealed, heatstrengthened, and tempered. Sep 06, 2016 overview of laminated glass laminated glass, regard as safety glass, consist of two or more panes of glass with one or more layers of polyvinyl butyral pvb sandwiched between them and treated. Making glass stronger two types of safety glass are heatstrengthened and tempered.
Annealed, heat strengthened and tempered glass are the three main types of glass used in buildings around the world. Code of practice for use of glass in buildings ais glass. Heat strengthened and fully tempered guardian glass. Heat strengthened glass is similar to tempered glass except that the cooling is done at a much slower pace. Heat strengthened glass is a semi tempered glass, which has been strengthened thermally by inducing a surface compression of 6000 to 9000 psi as compared to a range of 1 to 20000 psi in case of fully tempered glass. It is in the quench where the end product becomes either fully tempered or heatstrengthened glass, depending on the amount of cool air forced onto the glass. The result is a durable, high performance glazing composite material, which if broken, tends to retain glass. It should not be used where safety glazing is specified. Heat strengthened glass tempered glass tempered plate. Heat strengthened glass toughglaze uk ltd 0208 838 4400. Because of the compression in the glass, heat strengthened glass is approximately twice as strong as annealed glass of the same thickness. It is about twice as strong as annealed glass and breaks into relatively large fragments that stick to its glazing framework when broken.
When broken, the fragments are larger than tempered glass but are less prone to spontaneous. Although heat strengthened glass does offer potential. Heatstrengthened hs glass has been subjected to a specifically controlled heating and cooling cycle, and is generally twice as strong as annealed glass of the same thickness and configuration. Heat strengthened glass is flat glass that has been heat treated to have a surface compression between 3,500 and 7,500 psi 24 to 52 mpa which is twice the surface compression of annealed glass and meets the requirements of astm c 1048. For best performance, the outer lite of glass should be tempered and the inner lite heatstrengthened.
Annealed glass is heat strengthened so that it can tolerate more rapid and uneven temperature swings during its service life, for instance where the glass is backed with insulation, backpainted, is in the presence of certain lowe coatings, or uneven shading. Two types of safety glass are heatstrengthened and tempered. This compression allows the glass to tolerate more rapid and uneven temperature swings. Frequently ask question tinted hurricane windows, fort. Wire glass is used in firerated windows and doors because it meets most fire codes. It is most typically used as transparent glazing material in the building envelope, including windows in the external walls. We are proud to be one of the famed manufacturers and suppliers of heat strengthened glass in greater noida, uttar pradesh.
Heat strengthened glass tempered glass tempered plate glass. Heatstrengthened glass generally fractures in a manner similar to annealed glass and tends to remain in the opening when broken. Heat strengthened glass is cooled at a rate faster than regular annealed glass. Heat strengthened glass, curved tempered glass, safer mesh. Heat strengthening of glass is available in sizes of 168 x 96 4,367. Like the difference in glass thickness for the laminated product, you may be seeing different thicknesses of sacrifical glass the nonimpact glass of the dual pane igu offered in various windows. Glass also varies in strength and breakage pattern based on how the glass is treated. Heat strengthened glass generally fractures in a manner similar to annealed glass and tends to remain in the opening when broken.
This can vary in thickness from 516 to 916 and glass type by using annealed, tempered, or heat strengthened glass. Both of these processes have specification requirements, tolerances, and testing procedures which are defined by astm international document c104804. Triplepane cause the outdoor a guidelines the continued progression towards energyefficient windows will increase the need for triplepane insulating glass. Architectural heat treated glass heat treated flat glass. Heat strengthened glass pang luon pranet import export. Heatstrengthened glass is cooled at a rate faster than regular annealed glass. Processed by tempering oven through 670720 degree heating and cool down with wind, but different from toughened, the cooling process is much slower. Glazing the securing of glass in prepared opening in windows, door panels, screens. It is not considered a safety glass if use in single piece and if broken, forms large pieces. Compression strengths in tempered glass are higher than in heat strengthened glass.
Heat strengthened glass is a semi tempered glass which retains the normal properties of ordinary float glass. A consumers guide to understanding glass standards used in. Heat strengthened glass,heat strengthened laminated glass. Heatstrengthened glass is not considered a safety glass product as defined by the above mentioned glass standards, and typically breaks into larger pieces than. Hs glass must achieve a residual surface compressive rsc level between 3,500 and 7,500 psi for thickness up to 6mm, according to astm c 1048. C, but the cooling process is slower than that for tempered glass. This method was replaced by horizontal roller hearth ovens.
Heat strengthened glass china greenhouse glasstempered. Heatstrengthened glass is approximately twice as strong as annealed glass with significantly greater resistance to thermal stress when compared to annealed glass of equal thickness. For heatstrengthened glass, the requirement is a surface compression of 3,500 to 7,500 psi with no requirement for edge compression. Glass standards and guidelines the following chart lists the industry standards and specifications that apply to glass used in windows, doors, skylights and architectural glazing applications. Both of these processes have specification requirements, tolerances, and testing procedures which are defined by astm international document. In the end, heat strengthened glass is approximately twice as strong as annealed, or untreated, glass. Page 2 of 3 revised 110507 heat strengthened glass product data sheet properties heat strengthened glass has about twice the mechanical and thermal strength of annealed glass of equal thickness. From structurallyglazed facades to curtain walls and skylights to railings, our facade solutions can efficiently. The compression area encompasses the remaining 20% of the outer edges of the glass see diagram below. Oldcastle buildingenvelope heatstrengthened glass is approximately twice as strong as annealed glass of similar thickness and configuration. Heat strengthened glass also reduces breakage potential from thermal and bending stresses. Check with your andersen dealer for glass options that make andersen products energy star v 6. Viracon your singlesource architectural glass fabricator.
Architectural heat strengthened glass introduction. Pilkington toughened glass pilkington first in glass. This process can be done on glass with a minimal thickness of 18 3. Overview of laminated glass laminated glass, regard as safety glass, consist of two or more panes of glass with one or more layers of polyvinyl butyral pvb sandwiched between them and treated. The tension core area makes up the middle 60% of the thickness of the glass. The industry standard specification requirements for heattreated or tempered glasses are astm c1048.
In this case pilkington toughened glass ths should be specified along with the other product benefits required. Tempered glass is approximately four times stronger than regular annealed glass of the same thickness and configuration. A glasstech is a glass manufacturer in singapore that customizes architectural glass products. Concerns regarding specific glass characteristics should be evaluated by a professional having. Heat strengthened glass is not a firerated glass product. It generally fractures in a manner similar to annealed glass and tends to remain in the opening when broken. Heat strengthened glass is about twice as strong as annealed glass of the same size and thickness. Heat strengthened hs heatstrengthened glass is twice as strong as annealed glass of the same thickness, size and type. Heatstrengthened glass is cooled at a slower pace, creating glass twice as strong as annealed glass. This glass is preferred over annealed glass of similar thickness and configuration due to its high strength and more resistance to external stresses. Use thicker glass, as it is less prone to distortion. It is roughly twice as strong as annealed glass of similar thickness and configuration. Heatstrengthened glass is flat glass that has been heat treated to have a surface compression between 3,500 and 7,500 psi 24 to 52 mpa which is twice the surface compression of annealed glass and meets the requirements of astm c 1048. Heat strengthened glass product data sheet properties heat strengthened glass has about twice the mechanical and thermal strength of annealed glass of equal thickness.
Annealed glass, heat strengthened glass, tempered glass and. Glass is also used for internal partitions and as an architectural feature. In the end, heatstrengthened glass is approximately twice as strong as annealed, or untreated, glass. If broken, heatstrengthened glass will break into large shards similar to annealed glass. Guardian heatstrengthened glass is the preferred choice for projects where safety glass isnt necessary, but resistance to wind and heat is key. The industry standard specification requirements for heat treated or tempered glasses are astm c1048. It used to be that glass was tempered vertically and held in place by tongs. Safety glass is glass that is specifically designed to be less likely to break, and less prone to inflicting injury when it breaks. In a specification, the designation for annealed glass is an.
This thicker glass is an available option for most pgt windows and is standard in the majority of pgt doors. Laminated glass with heat strengthened glass substrates laminated glass is produced by bonding a plastic interlayer between two or more panes of glass under heat and pressure in an autoclave. Pilkington toughened glass ths is the heat soaked form of pilkington toughened glass for those applications where a reduction in spontaneous fracture is advantageous, such as structural applications, barriers and roof glazing. The difference between heat strengthened and tempered glass both are heat treated heattreated glass products, whether heat strengthened or tempered, are produced in a very similar fashion using the. When broken, fully tempered glass usually breaks into a multitude of small fragments. Architectural glass is glass that is used as a building material. Tempered glass is approximately 4 to 5 times as strong as annealed glass of the same thickness. Pilkington toughened glass is a safety glass up to five times stronger than ordinary glass of the same thickness. Toughglaze uk heat strengthened glass and glazing has three main criterias, thermal safety, reduced surface distortion and maintaining rigidity.
This interlayer also adds to the strength of the glass with a pvb interlayer being more of a soft. American fabricators typically offer fully tempered glass in thicknesses of 18 to 34. When used in buildings, glass is often of a safety type, which include reinforced, toughened and laminated glasses. Toughglaze, based in london, supply glass and glazing for commercial products and projects, throughout the uk. Annealed, heat strengthened and tempered glass are the three main. From structurallyglazed facades to curtain walls and skylights to railings, our. The triplepane unit is more complex than the standard doublepane unit because of the reaction that occurs with two sealed airspaces. Heatstrengthened glass is about twice as strong as regular annealed glass of the same size and thickness, which makes it more resistant to wind loading and impacts. Future architecture glass llc, uae presents the industrys most comprehensive range of architectural glass and glazing products like heat strengthened glass, tempered glass, ceramic fritted glass, curved tempered glass which are designed to cater to the most demanding applications.
It is intended for reference and guidance only and should not be used to assess the suitability of specific installed glassglazing. Tempered and heat strengthened heattreated glass is glass that has been prestressed by heating followed by sudden cooling to give it two to four times the strength of ordinary annealed glass. Doublestrength glass dsb is a single pane of glass 18 thick. Heat strengthened and tempered glass are heated to 1200 degrees f, then rapidly cooled. Laminated glass is 2 pieces of glass that are laminated together using a polymer interlayer.
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