Paarhammer Pty Ltd
Sliding Doors, Windows & Glazing, Bi-Fold Doors
Glass is an important factor for the performance of windows and doors. Here are some terms and explanations and how glass can be used:
Annealed Glass: the common flat glass often used in double glazing. It tends to break into large jagged shards.
Toughened Glass: annealed glass is heated to above 600 °C and the surface then rapidly cooled, resulting in increased resistance to breakage. If it does break it breaks into small regular, mostly square fragments.
Laminated glass: this is made of two or more layers of glass with an interlayer bonded in between, providing safety and security. In a breakage the glass is held together by the interlayer. Colouring, sound dampening, resistance to fire or ultra violet filtering can be incorporated.
Coated glass: surface coatings are applied to achieve low maintenance, scratch resistance, special reflection, transmission or absorption.
Conventional single glazing offers little resistance to the passage of heat. Solar radiation that is not reflected or absorbed is transmitted through the glass.
Tinted glass is the most common type of absorbent glass and comes in a range of colours.
Reflective glazing maximizes light transmission while reflecting solar radiation and is often used to reduce heat gain especially on western elevations.
Low E glass (low emissivity) has a metallic or oxide coating which reduces transfer of heat or cold through the glass while still allowing light through. Mostly used in double or triple glazed units.
Double glazing consists of 2 panes of glass (any glass combination can be used) with sealed spaces of ideally 12 to 16mm in between. This space can be filled with air or an inert gas (like argon).
Argon gas has molecules that are larger than air molecules and can therefore provide better insulation properties, increasing efficiency by 7 to 15%. It is colorless, nonflammable and odorless and as such not detectable.
Triple glazing has 3 panes of glass (any glass combination can be used) with sealed spaces of ideally 12mm in between each. Some triple glazed windows can have a U-value as low as under 1.0 Parhammer’s best is 0.8 U-value.
Available now: Self-cleaning glass, switchable I-glass, glass which generates energy, nano covered glass, sound protection glass, bushfire resistand glass, etc are all special glass options available now.
What the future holds: In the future Australian window manufacturers will also have access to glass with heat mirrors, hence increasing energy efficiency even more.
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