Glass acoustic rating chart. 35 Switchglass interlayer x 10mm glass Acoustic 42 SGA-22.

Glass acoustic rating chart A thicker interlayer than what is commonly Please reference the below STC ratings chart if you haven't already for a brief overview of the different ratings and what they mean. Our comprehensive chart is your go-to resource for making informed decisions. The higher the dB rating, the stronger the sound. 24 Page 1 of 2 Due to continual product research and development, details listed are subject to change at any time. Some of the considerations when The performance data below applies to an insulating unit. Most of the time, an assembly’s OITC rating is lower than an STC rating. The first column is the rating of the door panel only; tested in a static inoperable condition to determine the sound transmission through the door. STC is determined by a weighted average of TL values taken over 16 frequencies, which are fitted to a curve in The chart below indicates the STC rating of specially made acoustic doors using various applications of gasketing. VLam™ Hush is a laminated Grade A safety glass. 35 Glass and Framing System Construction STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 Glass 1 3/4" (19. The glass types listed below are included in the Laminated Glass offering. Figure 3 shows the difference between 10mm glass and two types of 10mm lami-nates (as 10. But they also differ quite a bit: for example, Rw covers a larger frequency range than STC. The Science Behind Acoustic Glass In the simplest terms, acoustic glass is made of multiple glass layers bonded by a special interlayer that absorbs sound and reduces the noise that enters an indoor space. Address: 6301 N Florida Ave Tampa, FL 33604 Acoustic glass is widely used among car manufacturers. Oldcastle BuildingEnvelope ® offers a variety of glass products to meet your architectural glazing design needs. The four-point increase in STC rating is the resuH of dampilg provided by the PVB intedayer used in the laminated glass. 7 %µµµµ 1 0 obj >/Metadata 5715 0 R/ViewerPreferences 5716 0 R>> endobj 2 0 obj > endobj 3 0 obj > endobj 4 0 obj >/Font >/XObject >/ProcSet[/PDF/Text Managing acoustic performance and privacy are more important than ever. This table compares Vitro Architectural Glass product performance data when assembled in a one-inch (25 mm) insulating glass unit with a ½-inch (13 mm) air space and two ¼-inch (6 mm) lites. 35 25. Sektor 90 Double glazed I-line joint 1 x 12. STCratings have been determined from TL data using ASTME413. An Outdoor-Indoor Transmission Class rating specifies noise transmission from outside to inside. Having determined the noise source level rating and the desired internal noise level for a given room, the next step is to find a glass product from Table Tested under ASTM E90, laminated outside pane consisted of either 1/8"-0. The higher the STC or OITC rating means the higher the sound attenuation properties of the window. This value is measured in specific laboratory settings under BS EN standards in order to achieve a constant, corresponding acoustic index across all building materials. This will most likely require the top of the glass pavers to be sandblasted to ensure they comply. Some vocabulary to know: A Sound Transmission Class rating specifies noise transmission from room to room. 35mm 10mm glass x 2. 030" P. Rw ratings are similar to STC in that they follow familiar testing methods. Opinion: A-NSD-01 : 10. Acoustic Glass A proven, superior alternative to standard glazing - Walshs Glass’ Acoustic Laminate can be used across a wide range of internal and external applications, and in environments where external noise can be problematic such as homes, offices, and hospitals. %PDF-1. Configuration = 44. The acoustic insulation property of a glass unit or frame is defined by R which represents the acoustic power difference from one side of the glass to the other. lists the glass to be used to achieve the upper and lower sound level at the room side of the glass. Because of its PVB core, if acoustic glass breaks, it tends to shatter into small pieces rather than large dangerous shards. For example, the sound of a whistling bird (50dB) is stronger than the sound of a falling As a general rule, where single glazing is used, the acoustic performance of the glass improves as the thickness increases. Acoustic Information. Sep 2022 . 8mm acoustic lam // 6mm float 40 38 34 Acoustic laminate and heavier glass. Take a look at the JCW soundproofing products and options available. -1/8" (total 3/8" thick), 1/4"-0. Get in touch to learn more about how DIRTT can help meet your speech privacy needs. 10 mm float // 8. GLASS TYPE RW RATING: TEST NO. 8mm acoustic laminate glass - 50dB Sektor 115 Double glazed DGA314 mullion with DGA215 trim 2 x 6mm toughened glass - 43dB Acoustic ratings are measurements used to describe how effective partitioning can reduce sound transmission between spaces. Please contact Oldcastle BuildingEnvelope ® for product availability and Acoustic laminated is a high-quality laminated glass with a PVB (polyvinylbutyral) acoustic interlayer that considerably reduces noise. 5 hush: 37 TL666-04-1: Glass size and glazing system will affect STC rating. Acoustic Glass. Acoustic doors and frames can be deployed anywhere in the workplace, or even at home, to create a much calmer, more peaceful environment for all. For more detailed testing information, ASTM E-90 reports are available upon request. Double glazed systems allow you to accommodate different thicknesses of glass, so a wide range of acoustic ratings can be achieved. It is an International Organization for Standardization (ISO) rating and part of the ISO 140 (Acoustic) family. VLam™ Hush can incorporated in an insulated glass unit with different glass types from across our product range to provide additional benefits such as privacy, security, noise reduction and energy efficiency. 08kg/m2 Other types of acoustic glass are available and can achieve Rw values up to 58 RAL: TL06-122 22. See Section 3 for actual Glass is one of many components that influence the acoustical performance of doors, partitions, windows, skylights, and vertical wall glazing systems. Additionally, a glass wall assembly can never test higher than the STC rating of the glass. ] SVC Rw summer TL 85-198 TL 85-170 - - TL 85-234 TL 85-229 TL 85-225 - - TL 85-228 - - TL 85-230 TL 85-213 The gap between lites also provides acoustic insulation, to improve STC ratings. 4 mm) 1/2" - - 36 37 6 1/2" Gypsum board (both sides) screwed to 3-5/8" metal studs 36 36 4" Face brick, mortared together 45 45 6" Lightweight concrete block, two coats of paint each side 46 46 4" Hollow STC Ratings Chart. Intuitive and flexible, our SoundPro tool provides acoustic performance data for tested glass configurations as well as The higher the STC rating, the better the soundproofing. Technical Data. Aircrafts, automobiles, trains, machines, generators, house hold appliances and even entertainment generates sound or noise that can distract attention, disturb sleep and create anxiety. Heat efficiency usually requires a maximum gap of 16 millimeters, but a larger space is always better for soundproofing. STC is widely used to rate interior partitions, ceilings/floors, doors, and windows. archskirt. Phone: 888-815-9691. 8mm acoustic laminate glass + 1 x 12mm toughened glass - 48dB Sektor 90 Double glazed I-line joint 1 x 12. values of insulating glass constructions. 01159 007 104 24Hr Glazing. A higher sound transmission class rating indicates more effective sound insulation than a lower rating. I’ll give you an example. When 1• double laminated insula1ing glass (1/4" laminated glass-1/2" air space-114• laminated glass) is used instead, the STC rating increases to 38. Drums are incredibly loud, A 6-12-4 mm glass will absorb more sound at high frequencies of 2000 Hz (claxon noise) than a 6-12-6 mm glass, in spite of having less mass. Reduces UV radiation by 99% reducing fading up to 8. -1/4" (total 1/2" thick), STC RATING CHART: STC: What can be heard at this level: 25: Soft speech can heard and understood: 30: Normal speech can heard and understood: 35: Loud speech can heard and understood: 40: Loud speech can heard, but not understood: 45: The threshold at which privacy begins: 50: Loud sound can be heard, but are very faint: 60+ At this level, good Find the best acoustic glass configuration with Saflex SoundPro. DS/AL6/0121v6 TECHNICAL INFORMATION Resistance to Fire NPD Reaction to Fire NPD Absorption coefficients of common building materials and finishes. 76mm/12mm/4mm float glass Double glazed units with acoustic glass on the exterior pane 40 30. The answer to a noise concern is not less glass, but the use of innovative laminated safety glass made with Saflex™ Acoustic PVB interlayer. Acoustic Range Keep the outside out of living and work spaces with our soundproofing options. Acoustic glass is a double glazed unit that includes a pane of laminated glass. LAMINATED GLASS Laminated glass will typically deliver better sound reduction Single & Laminated Glass Data. 060 P. Here is some information about acoustic ratings and how they are determined: Calculating STC ratings can seem a little bit tricky at first, but it’s not as complicated as you might think. Seek out the advice of acoustic professionals or engineers in complicated situations or for projects requiring high security. txt) or view presentation slides online. The cavity does not make any acoustic difference up to 20mm cavity. PRINT DATE . Acoustic doors, Figure 1. The higher the STC rating, the better the sound isolation. 35 Switchglass interlayer x 12mm glass Acoustic 43 SGA-26. A comprehensive guide to Darley Aluminium’s Acoustic Ratings. -1/4" (total 1/2" thick), 1-7/8" overall - 1/4" glass, 1/2" airspace, 1/4" glass, 1/2" airspace, 3/16" glass, . I recently worked with a client who wanted acoustic solutions for a drum set. The STC ratings for windows and glass can range from 18 to 65, Solid wood doors typically have an STC rating between 30 and 35, while standard steel doors often have an STC rating in the 25-35 range. . 5 times over normal glass. These innovations include the Acoustic Ratings Darley Aluminium Systems. National Processing Capabilities . Achieve the necessary acoustic balance by customizing your treatment. 76). 52 RAL: TL07-188 26. 35 Switchglass interlayer x 10mm glass Acoustic 42 SGA-22. Report: TL723-02-01 Oldcastle BuildingEnvelope ® offers a comprehensive line of laminated glazing solutions including security glazing. Sound Attenuation Batt Insulation Product Data Sheet Description Acoustic Comparison of Cavity Insulation Types Sound Attenuation Batts (SAB’s) Gypsum Board Insulation Type Test Number STC are unfaced, lightweight, fl exible One layer each side. pdf - Free download as PDF File (. 70 60 --STC38 ViraconAcousticPerfDataTables. Figure 1: Sound Transmission Loss of Laminated Glass with Saflex® Q series acoustic interlayer and Saflex ® R series interlayer. Created Date: Understanding the acoustic properties of laminated glass not only contributes to its optimal use in various applications but also helps in improving its design for enhanced performance. The final STC/OITC rating %PDF-1. Learn more. As a guide when frames are This document presents an overview of glass acoustical performance and considerations when specifying glass to achieve specific acoustical objectives. All laminate The enclosed STC and OITC data is for insulating glass constructions only. The effect of the laminate is to disrupt the soundwaves and to help STC Rating Chart. 8mm acoustic lam 42 41 38 Heavy and acoustic laminate. Single glass: 3: 14: 19: 25: 29: 33: 25: 28-4-1: 4: 17: 20: 26 Insulating Glass Construction STC OITC* 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 Sound Transmission Loss (dB) The OITC (Outsi de-In side Transmission Class) rating is used to classif y acoustic performan ce of glazing in exterio r applicatio ns. Window Energy Ratings were originally launched in March 2004 by the British Fenestration Rating Council (BFRC), an independent government-supported body established to develop and administer a system of Window Energy Ratings in In recent years, advancements in glass technology have led to the development of specialized acoustic glass products designed to achieve higher STC ratings while maintaining aesthetic appeal. OA Glass 1 Glass 2 Acoustical Ratings - Trinsic I V300 updated 04. February 2021. On the other hand, at lower frequencies between 125 and 250 Hz (traffic noise) this is not the case: a 6-12-6 mm glass reduces sound more effectively than a 6-12-4 mm glass. 1/4" 41 41 1" (26. Discover our products TABLE 1B: GLASS SOUND REDUCTION RATINGS Rw (dB) Page 3/3 situations, the Rw does not account for all noises generated. When installing glass paving in trafficable areas, the glass pavers often need to comply with slip resistance requirements. DUAL All values shown are glass only. STC ratings are predominantly used in the United States. B. 3 software and represents center of glass performance data. Any spoilers should be placed in spoiler tags as such: [spoiler] (spoiler goes here How to Read an OITC Rating Chart. Six Things You Never Knew About STC Ratings. 03 9021 6155 www. ‍The interlayers used for acoustic glass are between 0. Check with your framing system supplier for total window values. Triple Insulating Glass Construction Frequency (Hz) 6. Gostaríamos de exibir a descriçãoaqui, mas o site que você está não nos permite. Configuration System RW Rating Acoustic Report # 12. Double-glazed glass can also achieve an STC rating of up to 40. This article delves into the composition, structure, and acoustic behavior of laminated glass, a material that has increasingly become a preferred choice in settings that Guardian Glass is a leader in tools for the glass industry. Types of Acoustic Glass Laminated Explore the STC rating chart for walls, glass, windows, doors, and materials. The three basic principles for achieving optimum sound U Value Chart Download excel sheet of U values . 37mm & 47mm Proprietary Fire Door Assemblies 45mm Proprietary High Performance Steel Door Systems Performance testing A series of comprehensive test programs to establish airborne sound Acoustic glass stc rating chart pdf. 76), whereas the second laminate incorporates an acoustic interlay-er. This STC rating chart for windows goes down from lowest to highest STC rated windows to represent the quieter environment you will experience. Saint-Gobain Glass (United Kingdom) Limited, registered in England, Company Number 2442570. It is designed to reflect and absorb the soundwaves and limit sound frequencies moving between the panes of At Komfort, acoustic performance is a key element in the design and manufacture process of our acoustic glass partition systems. 01159 007 100 Mon - Fri 8. V300 | TrinsicTM Series Acoustical Ratings Intercept or Cardinal Foam or Dura**** Glass 3 Spacer STC OITC Test Date Test Number Operating Style Series Don't use this space to complain about the average rating, chart position, genre voting, others' reviews or ratings, or errors on the page. Rw is predominately used in international (ISO) Step Four: Window STC Rating Using charts discussed in each methodology and the minimum required NR determined in Step Three, the To understand how acoustic glass works as a soundproof glass, we must look at the science behind this glass and how it is different from traditional glass. Saflex SoundPro is helpful, free, proprietary software that Eastman developed to help you make the best glass configuration selection for your project, and it is available online at www. au 25-27 Ordish Road, Dandenong South . This glass has a multi-layered laminated construction using PVB interlayers which absorbs and dissipates sound waves effectively, and significantly reduces noise transmission. When combined with Guardian ClimaGuard® and Guardian SunGuard® glass it also offers improved solar control and thermal insulation, light transmission, appearance and clarity. 10mm float // 6mm float 40 38 35 Heavy and different thicknesses. Costing more than other materials, this is used mainly for exterior applications. As a result it is not recommended for glass selection of exterior wall applications since the single-number rating was achieved under a specific set of laboratory conditions. The STC rating figure represents approximately the decibel reduction in noise that the assembly can provide. This guide will help you navigate these ratings and ensure you specify the best solutions from ADL’s custom acoustics product line for your projects. 10mm float // 8. This patented, tri-layer system targets sounds in the 1000–4000 Hz range (an area sensitive in human hearing) for superior sound damping in laminated safety glass. You can’t simply compare an Rw rating to an STC rating. 1 mm) 1/4" laminate 1/2", Air 1/4" 39 39 Enhancing Acoustic Performance with appropriate Glass Sharanjit Singh Managing committee FOSG and Chairman GSC Glass Ltd. The Noise Reduction Coefficient (NRC) rating measures how well a material absorbs sound, helping reduce echo and ambient noise. 28mm The thickest possible single glazed acoustic glass that we can use 41 40. VAT Number GB 544 939 018. Nottingham, NG8 4GY. When thinking about STC STC Rating Chart For Windows. An expert can offer thorough insights into the unique acoustic issues your space presents and recommend efficient remedies. Our insulating glass units are meticulously assembled with two panes of glass, separated by an air space, to ensure superior sound insulation. 5mm Vlam Hush Glass Narrow Stile Door . Data is based on testing ~36″ x 84″ glass to ASTM E413-87 in an acoustical wall. -114• glass) with an STC rating of 34. 35mm 12mm glass x 2. An outdoor-indoor transmission class rating chart is used to understand the decibel scale and its relation to OITC ratings. 5mm thick. The second column is the rating of the operable door Soundproof & Acoustic Door Seals Acoustic Seal Regulations & Standards 35mm & 40mm Solid Core Unit Entry Type Doors 35mm & 40mm Sound Lock Door Assemblies Nom. At this rating, you may be able to hear very loud sounds faintly, but most sounds you won’t hear at all. 52mm 12mm glass x 1. The Fire Glass UK Fire-Rated Glass Selector is the perfect tool to help you select the right fire-rated glass for your project. Laminated glass is the next best option after secondary glazing to reduce noise but is usually more effective at reducing high frequencies such as aircraft noise. V. Discover how NRC ratings work, why they matter, and how Acoustic Sound Products can transform your environment into a quieter, more focused space. 2 MOST SENSITIVE RANGE OF HUMAN HEARING THRESHOLD 'DIP' The concepts of Noise Reduction Coefficient (NRC), Sound Transmission Class (STC), and other acoustic ratings are vital in designing spaces that meet your acoustic and aesthetic requirements. It includes the Sound Transmission Class (STC) rating and Outside-Inside Transmission Class (OITC) rating, Your test evidence may only be for one product, such as glass partitioning, or two products, such as glass partitioning and doors. Don't comment just to troll/provoke. Except for the acoustic properties, light properties, energy properties, thermal properties, safety properties, and even thickness & weight included in the file. As they do, it’s critical to understand acoustic ratings to ensure proper product selection, installation and desired outcome. BIM Objects. 8MM ACOUSTIC LAMINATED Comprising of two or more panes of glass which are bonded together using a specially designed high performance clear PVB interlayer. The different levels of acoustic partition ratings meet different requirements, with the acoustic screens available in both single and double glazed and available with or without a frame. 5 %¡³Å× 1 0 obj >>>/Type/Catalog/Metadata 59 0 R >> endobj 9 0 obj >/Properties >/XObject >/ExtGState >/ProcSet[/PDF/Text/ImageC/ImageI]/Font >>>/Thumb 19 Single glazed acoustic – LamiGlass 18. The standard provides a range for the “Design An acoustic consultant is an authoritative source of information and advice for analysing and developing solutions to noise problems. com. 4 %âãÏÓ 417 0 obj > endobj xref 417 28 0000000016 00000 n 0000001240 00000 n 0000001396 00000 n 0000002432 00000 n 0000004736 00000 n 0000006950 00000 n 0000007440 00000 n 0000009328 00000 n 0000009831 00000 n 0000010633 00000 n 0000011715 00000 n 0000012897 00000 n 0000013866 00000 n 0000015338 00000 n glass and laminated glass in order to under-stand how laminated glass can contribute to improved sound dampening. Learn why STC ratings matter for soundproofing. Various performances can be achieved by combing different types of glass thickness and number of interlayers. Is Complete Soundproofing Possible? Our STC rating When planning your acoustics—especially in environments like conference rooms or medical facilities where sensitive information is discussed—knowing the STC ratings of different materials is crucial. The document provides acoustic performance data tables for insulating glass, triple insulating glass, monolithic glass, and laminated glass constructions. 24kg/m2 Double glazed acoustic – Lamiglass 8. 00. Just as we were in 1932, we're ready As discussed in Section 2, STC ratings and the Rw for most glass configurations are equal. * * [The data and information set forth are based on samples tested and are not guaranteed for all samples or applications. The first laminate incorporates a standard interlayer (10. 9 mm) 1/2" 0. Determining ratings for windows, walls, and ceilings all happen the same way defined by the ASTM E90 standard. 37 . TRIPLE PANE INSULATING ACOUSTICAL DATA. 8. On the other hand, a typical window has an STC rating of 20. It is important to remember that you cannot mix and match different products and Sound Transmission Class Rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic. Registered Office: Glass 1 1/2" (12. 62-inch 10-12 PSF 2 Layers . 800-782-5742 Talk to an expert! MAIN MENU MAIN MENU. 5 hush: 36 TL666-03-1: 76mm Sliding Window 4/8/8. 8mm acoustic laminate glass + 1 x 10. It includes STC ratings for commonly used materials such as: In addition to acoustic performance, Guardian LamiGlass® Acoustic offers all the benefits of standard laminated glass, including safety, security and UV protection. Select your fire-rating, glass type, frame material and more and it will let you know what glass is certified for use. With our Acoustic range, buildings preserve peace and quiet inside, no matter what’s happening outside. The STC rating chart STC Ratings for Windows and Glass. Email: info@commercial-acoustics. Try now our easy-to-use, advanced software for glass and glazing system analysis. applicable to interior building partitions Tested under ASTM E90, laminated outside pane consisted of either 1/8"-0. 00 - 17. Noise •Modern living & growing technology creates noise / sound •Sound can distract attention, disturb sleep & create anxiety ACOUSTICS Sound Control Noise or sound is an unavoidable by-product of the modern living and growing technology. Acoustic glass; Other applications; Highlights Our story. Sound. In addition, it tends to be quite hard to break, which is another benefit, so if a child, pet, or even you fall against the glass, you shouldn’t crash through it. Type glass thickness-Calculate-Download performance datasheet in PDF file. Likewise, don't respond to trollish comments; just report them and ignore them. Glass Handling and Safety Guide . The higher the Rw value the better the acoustic performance. 52 Switchglass interlayer x 12mm glass Standard 42 SGS-25. ACOUSTIC PERFORMANCE DATA INSULATING ACOUSTICAL DATA PGI crafts an array of laminated glass products, (STC) rating. Glass size and glazing system will affect STC RAL TL 85 and TL 95 sound transmission loss tests are in accordance with ASTM E90. In fact, dual-pane windows with dissimilar glass can achieve STC ratings nearly as high, if not as high, as triple-pane or laminated glass. ACOUSTIC GLASS SINGLE PANE Nb Ref A - As per Pilkington & Glass Solutions/ Acoustic Rating Chart. 8mm and 1. Sound transmission class (STC) ratings solve that problem by giving a single value to acoustical performance for a door. At JELD-WEN, for example, we offer a variety of dissimilar glass combinations on our Vinyl windows that carry up to an STC 34 rating. At this rating, you would be able to comfortably hear a conversation going on outside. Acoustic Ratings 40 39 39 39 ** 36 TEST NUMBER Rw 2003207 2003206 CSI2006036 CSI2006035 CSI2006048 TNO2003208 CSI2006030 Acoustic glass, also known as soundproof glass, or noise reduction glass is specialist glass installed in noise reduction windows that can reduce the amount of noise that is transmitted through the glass and a window (or door). Acoustic glass, meanwhile, is designed with noise reduction in mind. It can also be incorporated into double-glazed units Search for suitable solutions based on glazing parameters and acoustic requirements. 8mm laminate 40 39 36 Heavy and laminate. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. Window Energy Ratings; Decorative Glass; Safety and Specialist Glass; Sealed Units; Boarding and Glazing; INFO. Optima offers a range of acoustic double glazed systems, from the slimline Revolution 54 to the thicker Revolution 100 system, which offers market leading acoustic performance (Rw51dB) and has its own unique range of 100mm thick glass doors. 17. Glass Brick Company have had Seves glass pavers tested and certified by the CSIRO for slip resistance to a rating of R10. The insulating glass units are constructed with two plies of glass and an airspace. Seek Expert Evaluation. pdf), Text File (. 10mm float // 4mm float 38 36 32 Non-laminate improved acoustic values. Acoustic glass typically has an STC rating of 35-40, compared to standard glass which usually has an STC rating of 27-30. KLASSICVIEW: 53mm KlassicView N/A: 76mm Sliding Window 10. 5mm Vlam Hush Glass Narrow Stile Door : 38 . What Is a Good STC Rating? An excellent rating is an STC of 60 or higher. 6. -1/8" (total 1/4" thick), 1/4"-0. 5 fi berglass insulation batts, ⁄8" None TL-92-618 38 5 designed to deliver noise control ⁄8" Glass fi ber TL-93-325 49 5 in metal stud Laminated glass. Noise Reduction Solution Charts In today’s noisy world, creating peaceful, productive spaces is essential. Glass size and glazing system will affect STC rating. Acoustic Ratings. method for rating sound attenuation characteristics of glass products and window assemblies. AcoustaTM Laminated and IGU's. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. All performance data is calculated using LBNL Window 7. 030" PVB, 3/16" glass 48 50; 49 4000; 5000. It can be a hazardous to overall health and prolonged exposure to This chart presents standard values of the weighted acoustic insulation coefficient R w, as well as the coefficient R for different frequencies of sounds tested for the essential structures of double glazed glass units presented in glass trade magazines and technical publications. Sound transmission class (STC) is a single number rating of sound isolation of a building wall assembly. saflex. gsuumr bla ztnron kblj jkkz vdrolak ngcw exmkv ffarn dbuo sfqn tqurmvah ywxqib lktlhzq kmxkn