What Is A Bad Temp.For A 10 Month Old Baby How Can Thermal Shock-Cracking Affect Your Glazing?

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How Can Thermal Shock-Cracking Affect Your Glazing?

Thermal shock is the name given to the cracking or explosion of glass due to a rapid temperature change. Glass is particularly vulnerable to this due to its low strength, low thermal conductivity and high thermal expansion. Glass thermal shock occurs when thermal gradients cause different parts of the glass to expand by different amounts. When the stress overcomes the force, the glazing will fail and either the outer pane will explode from the heat pressure building up, or more commonly the inner pane will crack. Thermal cracking can only occur on low strength glass so toughened or tempered glass can never be affected by thermal shock.

There are a number of internal and external factors that contribute to thermal cracking such as:

  • Shading caused by stickers, walls, trees or curtains.
  • Intense reflection of snow or sea.
  • Sudden temperature changes such as air conditioning or the rising sun.

“The Pittsburgh Plate Glass Thermal Service” published several reports blaming the glass industry for glass thermal shock incidents. We know that the temperature absorbed by glass fitted with silver reflective window film would increase the temperature by about 5oC, against about a 3oC increase if drapes are used. A 5oC increase in temperature would only produce a strength of 500 psi (10% of a single glass resistance factor) which is designed to withstand a resistance of 5000psi. This is without considering the reinforcement provided by the film itself. This means that thermal shock should not occur if the glaze is cut to the correct standards.

The main factors that are blamed for glass thermal shock are the installation of window film or drapes. However, these are not the cause, they only contribute to it. Without defective glass thermal shock will not occur. Many windows have small cracks around the edge of the glass that are hidden inside the frames, the thermal crack will occur from this place. Even the shaving of a small screw head entering the groove would be enough to initiate the break. The age of the frame and intensity of the differential radiation resulting from shadows are also factors involved in thermal shock.

European glaze is more delicate than that in the US, 90% of glaze in the US is tempered, which means it will withstand changes of 150oC versus 25oC for non-tempered glaze that is often found in Europe. This means that Europeans should be much more aware of the effects of thermal cracking.

Thermal shock causes cracks on sub-standard or damaged windows but these windows could have no problem for ten years, then window film is installed and the window cracks within a few months. This is not a coincidence, although the window film did not cause the thermal shock crack, it contributed to it because it increased the heat absorption of the glass which then results in a crack forming, the crack will start from a small hidden crack. inside the frame due to bad cutting of the glass. The same can also be said when drapes are installed.

Fitting window film to double glazed or triple glazed units is not advised due to high heat absorption between the panes, although a low absorption film such as lightweight Reflective Silver 50 or Coolclear will be fine. It is not recommended to install a film that has too high absorption on reflective glazing, as this will increase the absorption parameters and could result in thermal shock. Clearer films such as safety film, clear or deluxe UV window film or any of the lighter shades are also perfectly fine to install, alternatively any film can be installed externally.

Things to consider before fitting window film:

  • You should pay particular attention to round and split trapezoidal windows or other modern architecture
  • Holes or places where fans are used.
  • Be aware of old and large glass systems that have a frame that no longer ensures diffusion tolerance, as this also represents a thermal shock risk.
  • Fitting a film to wire glass is not recommended because the iron wires absorb heat by conduction and the edges of the glass are cut with handles that leave splinters that can become the source of cracks.

In summary its low quality glass, substandard edge cutting, mediocre glass installation, unsuitable window frames, external factors and shade which combine to cause a thermal crack on glass. If the glazing is of the correct standard thermal cracking can never occur on any home or office window.

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