GLASS SELECTION GUIDE - Eboss

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FADING (UV ELIMINATION) Fading caused by the sun’s solar radiation is a key factor in modern housing design. The main cause of fading is ultraviolet light (UV) but visible light, infrared radiation, humidity and pollutants all play a part. Insulating Glass Units can reduce the amount of radiation entering the home, by using a combination of glass types. In general terms, the lower the Fading Reduction Coefficient the less fading occurs. GOOD Clear laminated Clear glass or Low E glass Solution: GlassTech Laminated IGU Laminated glass is good because the PVB interlayer absorbs UV light. Low E glass is good because the coating reduces UV transmission. INNER OUTER BETTER Clear glass or Low E glass INNER Tinted glass OUTER Solution: GlassTech Tinted IGU Tinted glass is better depending on the tint colour and type as it absorbs UV, visible and infrared radiation. Low E glass helps to reduce the UV transmission even further. BEST Clear laminated INNER Tinted glass OUTER Solution: GlassTech Tinted & Laminated IGU By combining tinted glass and laminated glass the best fading reduction can be achieved. In addition reflective glasses can be used as they are the VERY BEST but they are not common for housing. www.metroglasstech.co.nz April 2013
PERFORMANCE DATA The following tables compare the Fading Reduction Coefficient (FRC) for a range of IGU’s. The FRC compares the fading reduction of the glazing with 3mm clear glass, which has a FRC of 1. The lower the FRC the lower the rate of fading. GOOD Fading comparison Clear glass or Low E Clear laminated Type Outer Glass (mm) Air Space (mm) Inner Glass (mm) FRC** - - 3 Clear 1.00 OUTER INNER GlassTech Laminated IGU with Clear glass or ClimaGuard N70 Low E 4 Clear 12 4 Clear 0.78 The above data is included for reference 4 N70 Low E 12 4 Clear 0.65 5 Clear 6 6.38 Lam 0.40 5 Clear 12 6.38 Lam 0.40 BETTER Fading comparison Tinted glass Clear glass or Low E Type Outer Glass (mm) Air Space (mm) Inner Glass (mm) FRC** 6 Bronze 12 6 Clear 0.36 OUTER INNER GlassTech Tinted IGU with Clear glass or ClimaGuard N70 Low E 5 Grey 12 4 Clear 0.39 6 Evergreen 12 6 Clear 0.34 6 Grey 12 6 Clear 0.34 5 Grey 12 4 N70 Low E 0.31 BEST Fading comparison Tinted glass Clear laminated Type Outer Glass (mm) Air Space (mm) Inner Glass (mm) FRC** 5 Evergreen 12 6.38 Lam 0.25 OUTER INNER GlassTech Tinted & Laminated IGU 5 Bronze 12 6.38 Lam 0.25 5 Grey 12 6.38 Lam 0.24 6 Grey 12 6.38 Lam 0.22 * UV elimination is calculated from Thermal 5.2.6 software using NFRC 100-2004 conditions and will vary with glass type. ** The FRC is derived from the damage weighted transmission data (Tdw-K) and compares the fading of the glass with that of 3mm clear float glass. For more options refer to the Catalogue and Reference Guide – Section 12 The Good, Better, Best approach is a simplification of the complexity surrounding the selection of the correct glass to provide the best design solution, and therefore other options, not listed on this sheet, are available from Metro GlassTech. In addition other factors can affect the glass selection such as the risk of thermal stress breakage and the requirements to comply with the NZ Building Code and NZS 4223. www.metroglasstech.co.nz April 2013
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