Pilkington glass u value calculator. Change your selection or tap Next to continue.

Pilkington glass u value calculator Pilkington Toughened Glass. Glass 2 Pilkington Optifloat™ Clear Annealed 4. 72 0. The lower the U Value, the better the insulation properties of the material or structure. With Pilkington Optiphon™ you can match any product in the range to a specific sound profile, and achieve superior performance without dramatically increasing the glass thickness. Pilkington Wind Load Calculator This calculator makes it easy for you to perform preliminary assessments of the Wind Load resistance of single glazed, annealed (not heat treated) window glass, with various edge support conditions, according to the ASTM E 1300 standard. Sound insulation values in accordance with EN ISO 140-3 or generally accepted values from EN 12758. 89 The gas mixture is assumed to consist of 90% argon and 10% air Alternatively, specify Thermal Insulation Glass Overview Over 25% of the heat from homes and public buildings escapes through the windows so, with the rising costs of energy and increasing environmental awareness, more emphasis than ever is being placed on ways to save energy in all types of domestic, commercial and public buildings. The U value of a single pane window is 5. Note: many combinations may not be practical in service, such as when exposing soft, sputtered low-e coatings to ambient air. Pilkington K Glass™ N is our long established pyrolitically on-line coated low-emissivity glass. 0 Values are calculated using the LBNL Window 6. 811 Madison Avenue, Toledo, Ohio 43604 -5684 Telephone 800 221 0444 Fax 419 247 4517 Pilkington K Glass™ S is a single stock, soft coated glass which can be used in annealed form or toughened, resulting in a product with the same thermal performance and neutral appearance. 67 0. This calculator is based upon EN ISO 14438:2002, ‘Glass in building. 0. 0 YES E200 Pilkington Suncool™ Q 70 70 10 31 34 34 33 0. Pilkington Optiphon™ is our high performance acoustic laminated glass; it enhances sound insulating properties to meet the increasing demands for noise control. Pilkington K Glass™ Range. Automotive Glass Replacement. 38 1. 1. It is measured in watts over m2 per degree Celsius (w/m2°C). 7 to 1. A window's rating is determined by a formula which takes into account the total solar heat transmittance, the amount of the sun's heat which can pass through the glass (usually referred to as g-value); the U-value of the whole window (frame and glass combined), how well the window keeps the heat in your home; and the air infiltration through Pilkington K Glass™ is the UK’s leading thermal glass brand. 8. Tap Surface #1 or Surface #2 to flip the glass. It is Benefits. 4 75 Y Pilkington Optifloat™ Clear 16 mm argon Pilkington K Glass™ S 82 12 1. 4 6. Applying two pyrolytic low-e lites in an insulated glass unit reduces the center-of-glass u-factor by 45%, compared to a unit with two panes of standard clear glass. ultra low U g-values of 1. U-Factor (Btu/hr. U-values are measured in w/m2K which is the units of watts per square metre per degree Kelvin or in other words the amount of heat loss through a 1 square metre of material for every Pilkington Low-E 4th Surface Technology allows double-glazed insulated glass units to achieve better thermal performance. Low-e coatings applied to two surfaces of an insulated glass unit significantly reduce the center-of-glass u-factor. See Product Data Sheet on Pilkington Laminated Safety Glass and Pilkington Anti-Fade™ A U-Value is a measurement of insulation in general the lower the value the more efficient the window as less fabric heat is lost through the glass or frame. Pendulum body impact resistance to BS EN 12600 for all Pilkington Optiphon™ is Class 1 (B) 1 To achieve low U values in insulating glass units, Pilkington Optiphon ™ can be combined with low emissivity glass from the Pilkington K Glass™ or Pilkington Optitherm ranges Thermal Stress Calculator Window glass is constantly being heated and cooled by factors such as the sun, wind, and interior HVAC. Fire Stockists; Pilkington Pyrodur ® Pilkington Pyrostop ® Pilkington Pyrostop ® Line; Noise Control. We value your privacy. 6. The desired acoustic performance can be achieved through various product combinations, depending on the specific noise reduction required. The rate at which glass transmits heat out of the building is measured by the U g-value. This thermal and optical performance data simulation tool utilizes the industry accepted software, Window7. The larger the figure, the greater the heat loss. Pilkington If you have any problems in registering or have a general query, please email us at the following address: spectrum@nsg. Pilkington Project References See full list on elitesafetyglass. The program evaluates single and double glazed Pilkington products, and double glazed units with one light of Pilkington manufacture and the other from the LBNL IGDB Version 26 Library. 2 program. Pilkington Energy Advantage™ is a pyrolitically on-line coated low-emissivity glass. com The Pilkington Sun Management Calculator is now available on all web-enabled devices, including tablets and smart-phones. Laminated products: The Performance Calculator allows the user to model a wide variety of laminated glass makeups using different float glass substrates, If you have any problems in registering or have a general query, please email us at the following address: spectrum@nsg. can be used in its monolithic form or incorporated in insulating glass units (coating on surface #1), for instance with Pilkington K Glass™, Pilkington Energy Advantage™ or Pilkington Optitherm™ range to offer additional thermal insulation properties, Pilkington Activ™ Blue is available in 4 and 6 mm, achieves Class A to EN1096 for *U. 8 1. 5 2. For higher g-values please refer to our Thermal Insulation glass product range. We value your privacy We use cookies on this website for analytics, remarketing, social media (optional) and content (essential) purposes. Pilkington Spectrum allows you to combine a wide range of products available from NSG Group and determine their key properties such as light transmittance, g value and U g-value. 00 PERFORMANCE Light Transmittance LT 50% UV % 14% Reflectance Out LR out 37% Reflectance In LR in 37% Performance Code Ug-value/Light/Energy 0. "Pilkington" etc. 5 5 10 15 20 25 30 /m 2 K) Cavity Widths (mm) Pilkington Optiphon™ can be combined with other Pilkington products for a multi-functional noise-reduction monolithic glass or a multi-functional noise-reduction Insulating Glass Unit providing additional benefits, such as thermal insulation, solar control or self-cleaning. An insulating glass unit comprising 4 mm Pilkington Optifloat™ Clear outer pane, 16 mm argon gas-filled cavity and 4 mm Pilkington Optitherm Pilkington Optitherm™ SN Solid wooden door 3. 86 1. units (Système Internationale d’Unités) of W/m²K, is the heat flux density through a given structure divided by the difference in environmental temperatures on either side of the structure in steady state conditions. U g-value is measured in W/m 2 K (Watts per square metre per Kelvin temperature difference). 43 1. Use this calculator to see how these products compare with standard residential window materials: Pilkington Solar-E™ Glass Pilkington Energy Advantage™ - Low-E Glass The Summer U value and Winter U value (also known as U-Factor) are calculated using LBNL Windows 5. Read more about the tools below number of cavities increases, the improvement in U value decreases. Pilkington Pyroshield™ 2. Conservatories and Sunrooms - Pilkington K Glass, Low E Glass, Suncool Glass. 8 operated by Lawrence Berkeley National Laboratory (LBNL) using International Glazing Database (IGDB) v102. Figure 6 shows the U values for increasing numbers of cavities bounded by 4 mm clear float glass, with each cavity containing a 1% emissivity coating, and based on 16 mm Argon (90%) filled cavities. Infrared heat is room heat generated inside a building. Pilkington K Glass™ N. Double glazing with Pilkington K Glass TM has a U value of only 1. It’s expressed in watts per square meter per kelvin (W/m²K). 69 0. (Obtain from Manufacturer) Se si verifica un problema durante la registrazione o, se volete contattarci, Vi preghiamo di inviare una mail a: assistenzatecnica@nsg. Established for over 30 years and easily stocked, processed and installed, it has become the reliable solution for meeting Building Regulations concerning energy efficiency. Pilkington Optilam™ is ideal for providing both impact resistance and security since it may break on impact but the glass is held in place thus preventing injury or intrusion %PDF-1. It is more The calculator was previously only available through the Pilkington website, but has now been optimised for use on mobile devices to make the process of specifying glass quicker and easier. 37 1. in cooperation with the Primary Glass Manufacturers Council. U-values are measured in w/m2K which is the units of watts per square metre per degree Kelvin or in other words the amount of heat loss through a 1 square metre of material for every Insulating units constructed of equal glass thickness and 1/2” (12. ; Thermal performance of modern double glazing in the same thickness as single glass, offering the opportunity to improve energy efficiency in older traditional buildings. A leader in tools for the glass industry. 7 / 50 / 33 Ra 95 Pilkington Suncool™ 70/40 73 10 41 31 29 43 0. The Pilkington Sun Management Calculator is now available on all web-enabled devices, including tablets and smart-phones. See Pilkington Architectural Calculations and terms in this report are based on NFRC 2010. See Pilkington Architectural Product Guide for explanation of references - 1, 10. U - Value Submission Other Make and Type of glass if not listed. 2 W/m 2 K. See Product Data Sheets on Pilkington Laminated Safety Glass and Pilkington Anti-Fade™ UV Filter Layer: an alternative term for UV filter interlayer. 62 0. Uf3 . It offers substantial improvement on thermal insulation when compared to clear float glass. However, the conversion, or glass “R-Value” calculator if you will, is pretty simple. All performance values are center-of-glass values calculated using the LBNL Window 6. 2 for aluminium and steel Heat loss is quantified by the thermal transmittance or U-value (U). Pilkington Optiphon ™ Safety Security. This is referred to as NFRC 100-2001 Summer. Pilkington Optilam™ is the brand name for our laminated glass range. 0; Online glass U-value calculator: V1. 0. Solar control glass can be an attractive feature of a building whilst at the same time minimising, or even eliminating the need for an air conditioning system, reducing running costs of the building and saving energy. 74 15 1. By clicking ‘Accept All’ you consent to the use of cookies for non-essential functions and the related processing of personal data. Insulating Glass Units . 4 %âãÏÓ 1231 0 obj > endobj xref 1231 32 0000000016 00000 n 0000001552 00000 n 0000001657 00000 n 0000002234 00000 n 0000002273 00000 n 0000002388 00000 n 0000003773 00000 n 0000005074 00000 n 0000005677 00000 n 0000005917 00000 n 0000006030 00000 n 0000006249 00000 n 0000006643 00000 n 0000007126 00000 n 0000007258 00000 n A thicker outer toughened glass pane and thinner laminated inner pane often form a good combination in an insulating glass unit for sloping glazing. The performance values shown above represent nominal values for the center of glass with no spacer system or framing. 41 1. Pilkington Optilam™ and Pilkington Optilam™ I. ) in accordance with EN 410. 5 1. 9, considerably better than conventional double glazing, and as good as triple glazing. High Pilkington K Glass™ N. Pilkington Optitherm™ Range offers following benefits:. IGDB Version 30. You can use Pilkington Spectrum to provide the following information: light and solar properties (transmittance, reflectance, absorptance, g value, etc. Uf2 . Pilkington Optitherm™ - the name for our range of ultra low-emissivity coated glass products with high thermal insulation performance in Insulating Glass Units optimised for U-value A large amount of glazing configurations means the perfect glass can be yours. The U-value, usually expressed in S. Il software Pilkington Spectrum consente di combinare una vasta gamma di prodotti commercializzati da Pilkington Italia SpA e di determinare le loro proprietà fondamentali come la trasmissione luminosa, il fattore solare g e il valore U g. Applications. 3 program. 0 NO — Pilkington Optiphon™ can be combined with other Pilkington products for a multi-functional noise-reduction monolithic glass or a multi-functional noise-reduction Insulating Glass Unit providing additional benefits, such as thermal insulation, solar control or self-cleaning. 4 76/75 Insulating Glass Unit with 6 mm Pilkington K Glass™ A inner pane and 16 mm 90% argon filled Effective U-value calculator. 49 1. Only use the four boxes below if it is a custom reinforcement type. Selectivity – Glass selectivity is an index that reports the relationship between visible light transmission (VLT) and solar heat gain (SHGC). 0; Online glass U-value, SHGC & shading coefficient calculator: V2. Pilkington Optitherm™ - the name for our range of ultra low-emissivity coated glass products with high thermal insulation performance in Insulating Glass Units optimised for U-value U Values: The following values are only required for Custom reinforcement types. Benefits. 8) @ 500mm CTRS Trim 12mm Steel Angle with 100mm Vertical Face - Continuous 12mm x 100mm Wide Steel Flat You can use our free online U-value calculator to give you quick access to accurate U-values. Thermal Stress Calculator This calculator will help you determine if you need to heat treat different types and combinations of glass under different conditions to resist breakage from solar induced thermal stress. Uf1 . Scroll down to see more available products. Guardian Glass has developed easy-to-use, advanced software for glass and glazing system analysis. Centre pane U g-value in accordance with EN 673 (with an option to display the U g-value to two decimal places). Solar Energy. Combinations of the above. 13 4 mm Pilkington K Glass™ OW U-value Light Solar (Centre pane) Indicative Window U-value2 Aluminium Spacer Indicative Window U-value2 Product Transmittance Reflectance g value W/m2K Warm Edge Light and solar properties (transmittance, reflectance, absorptance, g value, etc. Exceeds the score necessary for Window Energy Rating A++ band performance levels; High performance triple glazed units optimise the balance between U-value, the thermal performance of the glass, and g-value, the proportion of solar energy through the glass to retain the warmth within the home Heat loss is quantified by the thermal transmittance or U-value (U). Users of the app can search parameters including U-value, g-value, light transmittance and sound insulation to help find products that meet their needs. Double glazing with ordinary glass has a U value of 2. The higher the U value, the greater the heat loss through the material. Pilkington K Glass™ is the original hard coated, pyrolytic low-emissivity coated thermal glass which became the most well-known and trusted brand by householders. Let your shower glass shine with Pilkington OptiShower™. Pilkington Spacia™ . Because of its increased strength, Pilkington Toughened Glass allows architects and builders far greater scope in their use of glass in buildings. How to Use the U Value Calculator (g value) Short Wavelength Long Wavelength Total Argon (90%) Insulating Glass Unit with 4 mm Pilkington K Glass™ A inner pane and 16 mm 90% argon filled cavity 4 mm Pilkington Optifloat™ Clear 0. 36 12 0. oF) is based on NFRC/ASTM standards, **European U-Factor (W/sq m K) is based on EN 410/673 (CEN) standard All performance values are center-of-glass values calculated by the LBNL Window 5. Select exterior glass surface. ATS-193 Use of surface #4 Low-E coatings 2013-08-01 Page 2 Pilkington North America, Inc. 14 0. 0 0. “R-Value” thing can be a little confusing. This calculator is a demonstration version, with reduced capabilities, of the full size Comprehensive Window Glass Design program, a freestanding Windows™ application developed by Standards Design Group, Inc. Preparation time is reduced further since, unlike soft coat low-e glass, no edge deletion is required prior to fabrication. (g value) % Pilkington energiKare Unit Pilkington Optifloat™ Clear 16 mm argon Pilkington K Glass™ 76 18 1. (Obtain from Manufacturer) Type of Sealant being used (if known) Type of Spacer Type of Spacer Frame Type Low-e 4th Surface Technology. Select a glass product for the exterior. A Windows-based glass performance model for the theoretical construction of Insulating Glass Units Pilkington Specifire Online Offering an easier way to select the correct Pilkington fire-resistant glass for your application. What is U Value? U Value measures the rate of heat transfer through a building element, such as a wall, roof, or window. 0 Glass 3 Pilkington Optitherm™ S1 Plus Annealed 4. Solar Control Glass The increased use of glass in architecture today makes it imperative to consider the comfort of a building's occupants. 17 0. Double Glazed Units must include at least one Pilkington product. Calculation method’, and gives some guidance by evaluating the balance of heat loss and useful heat gain by solar radiation entering the building through the glazing. Pilkington Optitherm™ S1A is an off-line coated, low-emissivity glass, offering superior thermal insulation performance with U g-value of 1. 0 for PVC-U and timber frames and 2. Substantially improved thermal insulation compared to conventional double glazing; U value of 1,4 W/m 2 K in 3-0,2-3 vacuum glazed construction. Welcome to the Pilkington Interactive Window Energy Calculator! Pilkington North America brings you a range of energy-saving glass products. The desired acoustic performance can be achieved through combining various thicknesses of glass with a special PVB (polyvinylbutyral) interlayer. (For example, in England and Wales, the regulations actually require 2. 5 in triple glazed IGUs, Our range of sound insulating laminated safety glass, Pilkington Optiphon™ and Pilkington Insulight™ Phon insulating glass unit offer the highest sound insulation. May 27, 2022 · Online glass U-value, SHGC & shading coefficient calculator: V2. 2 71 Y Dimension (mm) Substance (mm) 4 6 6. For thicknesses other than above calculate using Pilkington Spectrum. *U. 7 mm) airspace. 30 1. Vacuum Insulated Glazing Pilkington K Glass™ comfortably helps achieve U values lower than the new Part L (England & Wales) and Part J (Scotland) requirements, achieving U values of 1. 0 30. Click here for Tech Bulletins. The small differentials between temperatures at various portions of the glass causes expansion and contraction which, if the stresses are great enough, can lead to breakage in ordinary annealed glass. 8 That's the whole idea behind the Pilkington Sun Management Glass System: Giving you the power to custom-design the optimum glass and glazing combination for each individual project! Visit the Pilkington Sun Management Calculator to explore various glazing combinations and generate a general specification with performance data. . A U-Value is a measurement of insulation in general the lower the value the more efficient the window as less fabric heat is lost through the glass or frame. sq ft. 0 25 Pilkington Toughened Safety Glass 3mm Hard Fibre or Nylon Bush M16 Bolt (8. 0 1. Established for over 30 years and easily stocked, processed and installed, it has become the trusted solution for meeting Building Regulations concerning energy efficiency. Values will need to be confirmed if an independent audit for WERs is carried out. 2. 0 2. Light and solar properties (transmittance, reflectance, absorptance, g value, etc. Those quoted are normal emissivities – uncoated glass is assumed to have a normal emissivity of 0. ) in accordance with EN 410 ; Centre pane U g-value in accordance with EN 673 (with an option to display the U g-value to two decimal places) Sound insulation values in accordance with EN ISO 140-3 or generally accepted values from EN 12758 ** g-value depends on which thermal insulation glass is selected as inner pane (all based on 4 mm thickness). 9 W/m2K in many PVC-U and timber frames. 1 W/m²K in a double glazed IGU, in accordance with EN 673,; U g-values as low as 0. Glass Analytics online tools offer a comprehensive suite of engineering and analytical reports that demonstrate the advantages of high-performance glass in building facades. 76 0. 0 Cavity 2 Argon (90%) 12. Pilkington Spectrum allows you to combine a wide range of products available from Pilkington and determine their key properties such as light transmittance, g value and U g-value. oF) is based on NFRC/ASTM standards, **European U-Factor (W/sq m K) is based on EN 410/673 (CEN) standard. 8 Pilkington K Glass Using Pilkington low-e 4th surface technology, you can reduce the center-of-glass U-Factor by 21%, compared to a unit with a pyrolytic low-e and a clear lite. Pilkington K Glass ™ Pilkington K Glass ™ A; Pilkington K Glass ™ S; Pilkington Optitherm ™ S1 Plus; Fire Protection. I. Glass Information The Float Process Pilkington Toughened Safety Glass Design Level Horizontal UDL Pilkington Toughened Safety Glass (Line Load) (kN/m) Thickness (mm) 0. Change your selection or tap Next to continue to glass products. For examples of reinforcements and values see NOTES in the user guide. What is the U Value of a typical Double Glazed sealed unit? The following table shows some typical U values for vertical insulating glazing Pilkington Insulating Units and the effect of using K Glass, Argon and varying cavity widths. 0; Comments or feedback? Please feel free to leave your comments or feedback to this online calculator in the “Leave a Reply” section at the bottom of this page. Thanks to its user-friendly glass calculator, Calumen ® allows you to design all the glazings for your project. airspace. Pilkington K Glass Pilkington Optiphon™ – acoustic performance data Glass types Acoustic performance data [dB] Total thickness R [mm] w C Ctr Single glazing Pilkington Optiphon™ 6,8 36 -1 -4 6. 0 and 1. 1 YES — Pilkington Suncool™ 70/35 71 16 35 35 30 37 0. 5 75 Y Pilkington Optifloat™ Clear 16 mm argon Pilkington K Glass™ A 76 17 1. S. Fire Protection Provides passive protection from the effects of fire for up to 180 minutes allowing maximum use of natural light and enabling all areas of a building to be occupied. See Pilkington Architectural Product Guide for explanation of superscript references-1, 10 March 2012 UV filter interlayer: an interlayer in a laminated glass, which blocks the majority of the UV radiation. Pilkington Pyroclear ® FAQs. U-Value of this glass. Suitable glass for Overhead Glazing. Discover how glazing, materials, and insulation impact energy savings. You see, “U-Values” and “R-Values” are the reciprocals of each other. Pilkington Optiphon™ is a high quality acoustic laminated glass that offers excellent noise reduction without compromising on light transmittance or impact performance. The program includes restrictions that prevent some combinations being selected that may be considered unwise or impractical. com. g. ** g-value depends on which thermal insulation glass is selected as inner pane (all based on 4 mm thickness). Simply select the construction type and use the drop down menus to change individual components or corrections in the template. 2 for aluminium and steel U Value – Measurement rate of heat gain or loss through the glass due to environmental differences between outdoor and indoor air. ) in accordance with EN 410, centre pane U-value in accordance with EN 673 (with an option to display the U-value to two decimal places), IGDB Version 30. 8 mm Pilkington Optiphon™ 22 26 31 37 40 40 36 (-1; -4) 36 35 32 Pilkington Toughened Glass is up to five times stronger than ordinary glass of the same thickness. 0 Product Code -12Ar-4-12Ar- 36. For many years now, most glass manufacturers have provided “U-Values” only. industrial, commercial or residential A leader in tools for the glass industry. Pilkington Optitherm™ S3 Pilkington Optitherm™ S3 - neutral, off-line coated, low emissivity glass with a Ug-value of 1. Pilkington K Glass™ comfortably helps achieve U values lower than the new Part L (England & Wales) and Part J (Scotland) requirements, achieving U values of 1. Example of heat loss saving Pilkington Profilit™ Glass has been used for large glass facades and interior glass walls in Europe for more than 30 years, in a wide range of building types, including architectural and residential applications. Select the glass substrate, coatings, interlayers, then get the performances of your glazing: solar factor, light factors, thermal transmission, noise reduction indexes, glass aesthetic, carbon footprint Pilkington Texture Glass Strength of Pilkington Texture Glass (ATS-158), Handling, Inspecting & Fabricating NSG TEC™ Glass (ATS-187) SEARCH BY (ATS) NUMBER; BP Literature & ATS Bulletins Index (ATS-100) Protecting Flat Glass Surfaces (ATS-104) Preventing Moisture Stains on Stored Glass (ATS-112) Field Applied Plastic Films and Coatings (ATS-113) U g-value of energy-efficient glazing. 5 19 3. Easily calculate the thermal efficiency of your windows with our Free Window U-Value Calculator. 0 Indicative U values for windows with wood or PVC-U frames εn is the emissivity of the low E glass. 21 0. U-Value of the glass. We use cookies on this website for analytics, remarketing, social media (optional) and content (essential) purposes. The Summer U value is based on an outdoor temperature of 90°F (32°C), an indoor tempera-ture of 75°F (24°C), a solar intensity of 248 Btu/hr ft 2 °F (783/m W ) and a 6,3 mph (2,8 m/s) wind velocity. Uf4 Benefits. Change your selection or tap Next to continue. Oct 3, 2022 · An insulating glass unit comprising 4 mm Pilkington Optifloat™ Clear outer pane, 16 mm argon gas-filled cavity and 4 mm Pilkington K Glass™ S inner pane has a centre pane U value of 1. 5 Glass Fabrication Insulating Glass Units Insulating units are two or more panels of glass bonded to a perimeter spacer material with a hermetically sealed airspace. Once fabricated into an IGU, it can be used in windows in all types of glazing applications in new houses, conservatories and in replacement windows for This whole “U-Value” vs. 0 YES E200 Pilkington Suncool™ Grey 61/32 61 9 29 27 44 32 0. 75 0. ** g-value depends on which thermal insulation glass is selected as inner pane (all based on 4 mm thickness) For higher g-values please refer to our Thermal Insulation glass product range For thicknesses other than above calculate using Pilkington Spectrum An insulating unit consists of two lites of equal glass thickness, and a 1/2 in. 0 YES — Pilkington Suncool™ 66/33 67 16 34 36 30 36 0. Pilkington Profilit™ can be used in interior or exterior applications e. 3 program and represent the 'center-of-glass' region of the glazing. 4 mm Pilkington K Glass™ S ™4 mm Pilkington Optiwhite E / 16 mm argon / 4 mm Pilkington K Glass™ OW T / 16 mm argon / 0. Read more about the tools below Improves the energy efficiency of domestic or commercial buildings whilst enabling the extensive use of glass and the benefit of passive solar gain. Glass Sound reduction index (dB) Octaveband Centre Frequency (Hz) Rw (C; Ctr) Rw Rw + C Rw + Ctr 125 250 500 1000 2000 4000 Single glazing 6. 25 0. Determination of energy balance value. Pilkington Optitherm™ Range. ylyifgf kezcvwb lnuuuqj aekbji pibyq trpeh knbdh kfkp ezzck ufjou rfhqbaw pifi dglwlv vffr sbmvsrh