Tempered glass is, under equal pressure approximately four times as strong as annealed glass. It resists breakage by small objects traveling approximately twice as fast as objects which break annealed glass. Tempered glass is also able to resist higher temperatures (200 ° F - 300 ° F) which would cause annealed glass to crack.

Our tempered glass is a safety glazing material that is manufactured to meet the requirements of the ANSI Z97.1 Standard and Federal Standard CPSC 16 CFR 1201. Federal Standard CPSC 16 CFR 1201, as well as state and local codes, require safety glazing material where the glazing might reasonably be exposed to human impact. This includes doors, tub and shower areas, side lite areas, and certain windows.When installed to older doors that currently do not contain safety glass we must replace all non-safety glass in the door opening (all glass within main frame of door) order to bring the door to current code or we can not replace any of the glass.

Tempered glass possesses the basic visual qualities of annealed glass. The induced stress condition sometimes produces a slight bow in tempered glass lites. Tempered glass that has been manufactured in a vertical tempering oven contains small surface depressions resembling dimples along one edge. These marks are caused by the pointed metal tongs which support the glass during its passage through the oven. Glass which is passed horizontally through an oven may contain a very slight surface wave caused by contact with the rollers. The waviness can sometimes be detected when viewing reflected images from a distance.

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In the production of annealed (ordinary) glass a silica-based mix is melted and cooled slowly under carefully controlled conditions. This annealing procedure removes  stresses from the glass.

Annealed glass is probably the most common glass around, however, it also has the potential of being one of the most dangerous glass types if used incorrectly. Many of the older homes in town still have annealed glass in their doors, this is a dangerous situation. Annealed glass in doors can break just by closing the door, or if someone were to walk into the door the glass would break into large jagged shards that could potentially cause severe cuts.When replacing annealed glass in doors it is required that the "door opening" be brought up to code, thus requiring all glass within the main door frame be replaced with safety glass.We recommend all the glass in your home be inspected and brought up to current code.

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Dual pane windows are made up of two pieces of glass separated by an airspace that are physically sealed together, and cannot be separated. Dual panes can be made up of countless combinations of glass and spacers to make the overall thickness anywhere from 7/16" all the way up to 1 and 1/4". Dual panes may also have tinted glass on the outer pane please note the tint when calling for an estimate. We can also upgrade your glass to tinted at an additional charge.  In general the more airspace that there is in the unit the better the insulation the window provides. There are other factors that can improve the efficiency of of your windows. Among the the best options you can have on your windows is a low-E coating. This will allow your windows to reflect much of the heat and UV radiation away from the inside of your home.Keep in mind, while shopping for a dual pane replacement that there are different qualities of dual panes, ranging from no warranty to a ten year warranty. Make sure you ask about warranty while while shopping, some companies may offer no or less warranty order to quote you a lower price.

It is important to note that application of any film tint does immediately void the original glass manufacturer's warranty. However, if installed by a reputable, professional film application company. Marc's Glass recommends Advanced Window Films for all of you filming needs.

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