Stc rating laminated glass. -1/4" AS(2)-1/8" (SEALED) RAL-TL95-296 .

Stc rating laminated glass To find out the best windows and their glass STC rating chart, contact the best window company in Toronto such as Vinyl Light. txt) or read online for free. Keep in mind that the STC and OITC rating numbers equate to how many decibels of noise are Our insulating glass units are meticulously assembled with two panes of glass, separated by an air space, to ensure superior sound insulation. Laminated Glass encompasses two pieces of glass that are permanently bonded together with an interlayer type including polyvinyl butyral (PVB), Sentry Glass (SGP), and ethylene vinyl acetate (EVA). OITC STC is Sound Transmission Class which is a single number rating derived from individual transmittance losses at specified test frequencies. Laminated and double-glazed glass both hold STC ratings of 40, but anything higher typically calls for a combination of the two. Except for the acoustic properties, light properties, energy properties, thermal properties, safety properties, and even thickness & weight included in the file. 52 mm + 11. 3mm thick monolithic glass, glass STC is only 30Dbs,when glass thickness was increased to 12mm thick,glass STC can reach 36Dbs,whether it’s single piece monolithic glass,laminated glass,or insulated glass,the thicker total glass thickness,the better sound Oldcastle STC Data Laminated Glass: Sound Transmission Loss Data (1) 1/3 Octaveband (HZ) STC. That is why designers must look at other more effective options to improve the acoustical performance of window systems. Should breakage occur, all layers are held together, instead of shattering into Acoustical Ratings: 1/4" = STC 29 1/2" = STC 34 LAMINATED GLASS 1/4" Thick Laminated Architectural Glass Comprised of Two Plies of Glass and a . Jeff says: May 25, 2016 at 7:12 am. It is a logarithmic scale and ranges from 18 to 50 for windows. The use of high acoustic functioning laminated glass can help protect people from NanaWall opening glass walls can be specified with various acoustic glass options from monolithic to sound enhanced laminated to double IGU to meet noise-reduction requirements. Costing more than other materials, this is used mainly for exterior applications. 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. Both STC and OITC ratings inform your window or door selection based on sound insulation method for rating sound attenuation characteristics of glass products and window assemblies. 030"-Lami; Laminated Insulating Glass: Sound Transmission Loss Data(1) 1/3 Octaveband (HZ) STC. How does dissimilar glass compare to triple-pane windows or windows with laminated glass? Let’s start with triple pane windows. Example:6mm clear tempered glass Laminated Glass: Laminated glass consists of multiple layers of glass with an interlayer, usually made of polyvinyl butyral (PVB). Single-Pane 27 Decibels. Reduces UV radiation by 99% reducing fading up to 8. 1/ 0. Laminated glass can also increase STC rating. Higher ratings mean better sound The American Society for Testing and Materials (ASTM) developed the sound transmission class rating (STC) to describe the sound isolation performance of materials. Glass also exhibits increased sound insulation performance with thicker dimensions, although it starts with a higher STC rating than plexiglass acrylic at the same thickness. This type of glass is highly effective in reducing noise and is 1/4" glass = STC 31 1/2" glass = STC 36 I'm not trying to be insulting, but as a matter of curiosity I googled "glass STC" and the very first page had that data. It includes the Sound Transmission Class (STC) rating and Outside-Inside It’s a type of laminated glass that includes a layer of acoustically-insulated layer to absorb sound waves and reduce noise transmission. Sound Transmission Loss (dB) 43 Insulating Laminated Glass Construction. Choose from clear and low-iron varieties of tempered or laminated glass in ¼” (6 mm), ⅜” (10 mm), or ½” (12 mm) thicknesses. 38mm laminate 30db 7. 70 60 --STC38 stc_rating_chart. 1) - PVB 34 8. A rating increase from 24 to 33 Laminated Glass Stc Rating Manufacturers, Factory, Suppliers From China, We've been prepared to cooperate with company friends from at your home and overseas and produce a wonderful future with each other. High The answer to a noise concern is not less glass, but the use of innovative laminated safety glass made with Saflex™ Acoustic PVB interlayer. It is measured in watts over m2 per degree Celsius (w/m2°C). The STC (Sound Transmission Class) rating is a single-num ber rating system for interio r build ing partitions and viewin g STC window rating depends upon several factors – glass thickness, laminated glass, the airspace between panes, and how and what the frame is constructed of. While there may be more effective options (such as laminated glass), window inserts are a good compromise between performance and At 1/4 inch thickness, it has an STC rating of 31. 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. Cardinal's laminated glass offers sound dampening, reducing audio decibel levels in high-noise areas. STC For better sound reduction, we also offer laminated glass with an STC of 38, which further lowers the sound level to 22dB, making it perfect for focused work or private meetings. The glass types listed below are included in the Laminated Glass offering. The higher the STC value, the better its insulation. Hi, Laminated Glass Details and Applications While the primary focus is on residential applications, much of the information can be used to gain a better understanding of glass performance in all types of buildings. The STC Rating ranges from 25 (no soundproofing) to 65 (completely soundproof). TD-128 - Laminated Glass - Thermal and Optical Properties Offers performance tables for selected laminated Vitro Glass products; TD-129 - Temporary Protective Overcoat Discusses the acoustical properties of glass, methods of rating, such as STC and OITC, applicable standards and the relationship between glass and other glazing components in LAMINATED GLASS Technical Specifications • Safety, Shatter-resistant, retains fragments when broken • Sound Insulation (STC Rating), 35-45 dB • UV Blocking, Up to 99% • Light Transmission, 70-90% (depending on glass type and interlayer) • Impact Resistance, Conforms to EN 356 (P1A to P8B ratings) Laminated glass consists of two or more layers of glass that are permanently bonded together with one or more polymer interlayers using heat and pressure. OITC* Frequency (Hz) 100 125 160 200 250 315 The OITC/STC ratings improve with the addition of more lites, sealed airspaces, and laminated lites. Figure 1. pdf), Text File (. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. Laminated glass is like the windshield of your car. This is, of course, dependent on factors such as what type and thickness of laminate are used, the thickness of the glass pieces used, and the overall thickness of the finished glass. The performance data below applies to an insulating unit constructed with two plies of glass and an air or argon filled space. OITC; Rw. 1/4" Lam. Laminated glass has a better STC rating than unlaminated glass, and double pane The STC (Sound Transmission Class) is a rating system for interior building partitions and viewing windows used to . 35 The Pros and Cons of Laminated Safety Glass. which is a great acoustic insulator. Laminated glass, due to its unique structure STC is a widely recognized measure for sound insulation in windows and doors, focusing on human speech frequencies. 030" PVB Interlayer Manufactured in USA NOT Fire-Rated STC 35 Rating POLYCARBONATE HIGH IMPACT Impact Safety Rating Information Complies With IBC Requirements for Use in Doors. VLam™ Hush is a laminated Grade A safety glass. The STC (Sound Transmission Class) is a The STC rating for glass is particularly important in applications such as recording studios, concert halls, conference rooms, and healthcare facilities, where maintaining a quiet and acoustically controlled environment is E413-87 in an acoustica l wall. By selecting the proper STC stands for Sound Transmission Class. Sound Transmission Class (STC)—measures sound transmission of interior spaces with frequencies ranging from 125 to 4000 Hz; higher STC numbers mean less sound is transmitting beyond an interior space. As discussed in Section 2, STC ratings and the Rw for most glass configurations are equal. It is made of two or more plies of glass with a vinyl interlayer between (sandwiched, if you will, as in a car’s windshield). Seals and Gasketing: Even the highest-rated door will perform poorly without effective seals. Types of Acoustic Glass Laminated Acoustic Glass. Get the look + light transmission of glass walls with improved acoustic performance for privacy. Doubling the mass of glass may also be impractical. values of insulating glass constructions. Laminated Glass for Sound Control Glass lamination consists of bonding two or more lites of glass together with one or more layers The STC value for a monolithic 6mm glass is 31, for an insulated 24mm glass is 35 and for a 13. 11F P. Thicker glass and interlayers tend to block more noise. How to Calculate the Glass STC - Free download as PDF File (. Special acoustic grades of laminated glass are available, which comprises two glass sheets with a layer of acoustic resin. In the past, STC was used as a preliminary comparison of various glazing materials. As you can see, 1” dual-pane glass has the same STC rating as a single pane of acoustic glass. 030"/ 3. It gets a better STC rating than triple pane glass, but it also costs more so you’ll need to weigh the options. A typical dual-pane window has an STC rating of 25-30. In Here we introduce a simple formula to calculate the glass STC-sound transmission class. A window’s STC rating varies based on the thickness of glass, a gas fill between the panes, and a window’s air tightness. V. Glass thickness and type & the STC rating is the last figure 4mm clear 29db 5mm clear 30db 6. OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500. STC Decorative laminated glass promotes productivity, natural light, and enhanced Sound Transmission Class (STC) ratings, along with unparalleled aesthetics for display cases, modular walls, dividers, and partitions within 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. 030 P. The STC (Sound Tranmission Class) performance of a sample range of glass. -1/8" (total 1/4" thick), 1/4"-0. Glass lamination encompasses adhering two panes of glass together with a special adhesive that adds strength and blocks soundwaves. It’s actually 2 pieces of glass with a piece of plastic in the middle. ) based on its ability to reduce sound coming through it. JEB Acoustic Partition & Door Catalogue 2023. the thickness of the glass, and how airtight they are. 500 630 800 1000 1250 1600 2000 2500. DIRTT's Double Pane Glass Wall delivers without compromise. The four-point increase in STC rating is the resuH of dampilg provided by the PVB intedayer used in the laminated glass. An STC label delineates how partitions and walls effectively block sound and reduce noise. 5lgM+13 R:Monolithic glass STC M:Glass density. * * [The data and information set forth are based on samples tested and are not guaranteed for all samples or applications. Laminated glass has proven to be an excellent barrier to noise, having a higher sound reduction index than monolithic glass of Acoustic laminates. -1/4" (total 1/2" thick), In terms of reducing sound transmission, the higher the STC or OITC rating number, the better the product. Polycarbonate. The best for its size is dual-pane acoustic glass, as this combines STC Ratings Updated : 01/18/2022 by K. This is produced with two pieces of regular or tempered glass sandwiched between clear plastic resin—polyvinyl butyral (PVB). *OITC is estimate d base d on this test. The rating covers the sound sources generated in building interiors such as However, it is important to note that different glass options and the use of combination units may affect the sound abatement performance of the unit. Type glass thickness-Calculate-Download performance datasheet in PDF file. This ‘dip’ means more noise is let through at these frequencies Double-glazed glass can also achieve an STC rating of up to 40. 200 250 315. One of the features of glass is sound proof,whether it’s single glazing, laminated glass,insulated glass or even laminated Laminated Glass. The two product graph lines follow each other closely but the ordinary laminated glass dips significantly, close to 10dB. We measure STC as a whole number – a higher number means better soundproofing. 1 / 7 2 / 7 3 / 7 4 / 7 Constructed with laminated or insulated glass, their soundproofing improves, and STC ratings range from 28 to 60+. Glass siz e and glazing system will a˜ect STC rating. Additional advantages of laminated glass include: Figure 1: shattered laminated glass to provide conservative estimates of required STC or Rw ratings to be used by the building designer as a planning tool for window glazing. What Does an STC Rating for Windows Mean for Your Home or Office? Sun and Sound Windows’ soundproof laminated glass window inserts have an STC rating of 42 if you have a single-pane window and 48 You can sometimes get the desired effect on windows by retrofitting with sheets of laminated safety glass on top of a dual pane window. Phone:0086-400-089-8280; The higher the STC number, the better the glass keeps out unwanted noise. If sound -114• glass) with an STC rating of 34. A detailed discussion of the methodologies and supporting analytical rationale are provided in Section 4. Consider that an average exterior wall of a stick-built home has an STC STC. The acoustical properties of glass is an important consideration when designing a wall in a conference room, corridor, or other space with a lot of glass which must achieve a specific STC rating. 160. Selectivity – Glass selectivity is an index that reports the relationship between visible light transmission (VLT) and solar heat gain (SHGC). In addition, the thickness of the glass and the type of interlayer used can also affect the sound transmission properties of laminated glass. As with any design issue, it is critical to establish the requirements of the system. A higher STC rating indicates a greater sound dampening effect. An STC rating of 45 is the generally accepted minimum standard, but 50 is considered decent soundproofing for a building. Laminated Glass Applications A brief review of acoustic ratings. However, depending on the goals for acoustical attenuation, it may be benefi cial to test the Sample STC 3. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to STC. STC rating (Sound Transmission Class rating) is a score given to a building’s surface (wall, ceiling, window, etc. Reply. An extra pane of glass can give a dual pane window a rating between 26 and 33. Achieving a high STC rating is crucial for spaces where privacy and noise control are significant, such as offices, conference rooms, healthcare facilities, schools, and libraries. -1/4" AS(2)-1/8" (SEALED) RAL-TL95-296 . It is a non-linear scale. Glass Kits: If your door includes glass panels, the type and thickness of the glass will affect the STC rating. Rw: 1/4" RAL-TL85-169 ; 31 ; 29 . 1mm Glass 29 7mm Laminated (3. Save as PDF 800 Park Drive , Owatonna , MN 55060 US | (800) 533-2080 Sound Control Laminated Glass Tel 604 882 3513 Fax 604 882 3510 TF 888 391 1166 Alberta Distribution Centre 6 - 4315 61 Avenue SE, AB T2Z 1Z6 Canada Tel 403 984 6573 STC rating may only be assigned to specimens tested in a laboratory setting. The final STC/OITC rating U Value – Measurement rate of heat gain or loss through the glass due to environmental differences between outdoor and indoor air. ] 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 Thinner glass has a low STC rating because sound travels through it easily. laminated units are available for increased performance. pdf - Free download as PDF File (. Glass Appearance: Clear. The STC rating measures how well a material can reduce the transmission of sound through a partition or wall. laminated glass n n 5/2011 S. STC ratings are a logarithmic scale similar to the earthquake Richter Scale, which means each escalating number is significantly higher in performance than the previous number. Hermetically sealed IG units paired with laminated glass perform well in ASTM sound transmission ratings. It lists the construction details and thickness of single laminated glass, laminated insulating glass, airspaced glass, monolithic glass, and various wall constructions. 24 mm) 1/8" 0. 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. Outside-Inside Transmission Class (OITC)—measures sound transmission of low- to mid-frequency noises through exterior In both laminated and double-glazed glass, the STC rating is 40, but anything higher calls for a combination of both. STC rated windows can increase to a 39-45 rating with the addition of window inserts such as Indow Acoustic Grade SF6 the overall STC rating of the glass can be improved by as much as 3 points. This can even go a step further with double-laminated insulated glass, which has two laminated panes of glass and an air space between. Thicker glass and laminated options typically offer better sound insulation properties. A double-pane window with at least one laminated lite will provide the greatest degree of noise insulation. OITC* Frequency (Hz) 100 125. Widely used STC (Sound Transmission Class) measures frequencies from 125 Hz Oldcastle BuildingEnvelope ® offers a comprehensive line of laminated glazing solutions including security glazing. (OITC, Rw, or STC) ID/City/Country/Glass Usage/Type (Performance Target Laminated Glass Laminating glass is a popular way to increase an STC rating. Increasing glass thickness is the most important measurement. It also can be used to reduce sound. Ratings are determined by broadcasting a specific auditory tone near the material, and measuring dB on bothsides. 1. OITC, on the other hand, covers a broader frequency range (80 to 4000 Hz), including lower frequencies often associated with external noise. It is manufactured by permanently bonding two or more lites of glass with layers of polyvinyl butyral (PVB) interlayer, under heat and pressure, to create a single construction. 030" P. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and Single & Laminated Glass Data. Windows with dissimilar glass typically have an STC rating around 34 which is similar to the STC rating of standard exterior walls. STC. 11. Laminated glass The document provides acoustic performance data tables for insulating glass, triple insulating glass, monolithic glass, and laminated glass constructions. The glass will tend to stay together and case one in is broken – thus qualifying as a safety glazing material. Glass Type and Typical STC Value. These are: Acoustic glass typically has an STC rating of 35-40, compared to standard glass which usually has an STC rating of 27-30. All laminate The enclosed STC and OITC data is for insulating glass constructions only. You should be aware that an increase by 10 in the STC rating means that the noise is reduced by half, which is the case here. 32 : 1/2" RAL-TL85-198 ; 36 ; 33 . B. Laminated glass increases the STC rating of a window and diminishes unwanted outside noises. Mass is for low frequencies, offset angles for high. 5 times over normal glass. Similarly, a ½” sheet of laminated glass has an STC rating of 38. Laminated acoustic glass consists of two or more layers of glass bonded together with a PVB interlayer. 2 L aminated Glass is a multifunctional glazing material that can be used in a variety of applications. Laminated panes’ STC ratings typically provide and STC rating reaching as high as 40 depending on the thickness of the glass and adhesive. The higher the STC rating, the more sound will be dampened. Double-Pane (insulating) 28 Decibels. What Is a Good STC Rating for Windows? As an example, STC rating of 22 to 24 with gaining two points, shows a 90% reduction in noise. play a significant role in determining STC. 37 : Lami-0. Designer Pack. STC and OITC are standards that measure sound attenuation. Glass thickness. Selecting a System to Match Your Space Planning Considerations HSW60 is an acoustic stacking glass door tested and rated up to unit STC 43. Pim Foam or Dura**** 3/32 3/32 - 28 23 4/19/99 TL99-145 1/8 1/8 - 30 24 4/28/98 TL98-188 1/8 3/16 1/8 5/32 3/16 1/8 5/32 1/8 Operating Style Series Numbers Glass 1 Glass 2 Spacer STC File Name: STC Ratings - Style Line | V250 Due to continual product research and development, details listed are subject Factors that affect glass STC. 8mm Sea-Storm Laminated glass is commonly used in coastal windows and where safety glass is needed, but these are not its only applications. Laminated glass is Single-pane windows can have an STC rating around 25. Product Sheet. OITC. Asia Pacific, Europe, South Africa, USA, Canada, Mexico and the Middle East. Laminated panes’ STC ratings typically provide and STC rating reaching high 30s depending on the thickness of the glass and adhesive. While increases may seem small, each increase of 10 in an STC rating halves the sound. I think the best bang for your buck were the alternating thickness A common way to accomplish this is to use laminated glass. Properly installed acoustical gasketing and thresholds are The STC rating is the average amount of noise stopped at 18 different frequencies, measured in decibels. 52 mm Laminated Tempered Glass STC 44; Tempered Glass (10 mm/12 mm) or Laminated Glass (5 + 5 mm/6 + 6 mm) options; Available In . 400. At 1/8 inch thickness, it has an STC rating of 30. 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. 52mm laminated glass is 39. Additionally, our COMO Glass Panel is an excellent choice The higher the STC and OITC ratings, the better the glass is at reducing sound transmission. Laminated glass with an air pocket is often recommended for better soundproofing. . Sound Transmission Class Sound Transmission Class (STC) is a single-number rating system that assigns a value to a product to indicate how well that product insulates against unwanted noise Most laminated glass will have an STC rating of around 40. If the dissimilar glass is your choice, that's a great solution as well, since it has an average rating of 34. The materials are tested in controlled conditions at frequencies ranging from 125 Hz to 4000 Hz and the performance is then converted into an STC rating. One US glass manufacturer who has the sound transmission class rating (STC) to describe the sound isolation performance of materials. Securing a higher STC rating than this is possible but impractical because it is STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 STC rating by increasing the air space alone. (STC) rating: 37-46 ; SCS Indoor Advantage The STC rating, or Sound Transmission Class rating, is a way to know how well a window reduces sound through absorption or by reflecting sound waves. -1/8" (total 3/8" thick), 1/4"-0. Oldcastle BuildingEnvelope ® offers a variety of glass products to meet your architectural glazing design needs. 38mm laminate 36db IGU 3mm clear/8mm air/4mm clear 28db Innovative acoustic interlayer for laminated glass. Laminated 35 Decibels ©2024 Andersen Corporation. Monolithic glass Formula: R=13. A clear single glazed window has an STC of around 25, and a standard clear double glazed window will be around 33-35. The STC ratings are for glass only in a fullview glass panel. Laminated glass increases the STC rating of a window, diminishing unwanted outside noises. The other key advantage to Laminated glass: 35-38: Noises can be barely heard. achieve a single number rating of 50 weighted reduction (Rw) or sound transmission class (STC) in comparison to ~30 Rw or STC for an insulating glass unit with 4 mm glass [12 mm air space] 4 mm glass. 060" PVB, 1/4" glass Laminated Glass Construction STC OITC 100 125 160 00 2 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 Frequency (Hz) Sound Transmission Loss (dB) LAMINATED ACOUSTICAL DATA 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. Laminated & Double-Glazed Glass. At 3/8 inches in thickness, it has an STC rating of 34. Laminated Glass Construction. 1/8" 35 35 Graph 1 shows the sound transmission loss of glass across a low to high frequency range, comparing ordinary laminated and Acousta™ laminated glass. The higher the rating, the better the window controls the sound. Contractors spec sheets should be able to give you the STC rating of their packages. The higher the STC or OITC rating means the higher the sound attenuation properties of the window. Please contact Oldcastle BuildingEnvelope ® for product availability and A sheet of laminated glass that is ¼” thick will have an STC rating of 35, nearly the same as regular glass that’s twice as thick. When combined with a hermetically-sealed IG unit, the acoustical benefits to your windows ¼-inch glass yields an STC rating of about 31; 3/8-inch glass yields an STC rating of about 34; 1/2-inch of acoustic laminated yields an STC rating of about 38-39; Regardless of the selected soundproofing materials chosen, in general, all glass and glazing solutions adhere to five principles for the best outcome. Sound Transmission Loss (dB) Laminated Glass Laminating glass is a popular way to increase an STC rating. The combination of thicker glass and laminated lites containing acoustic grade polyvinyl Tested under ASTM E90, laminated outside pane consisted of either 1/8"-0. Glass laminati on encompasses adhering two panes of glass together with a special adhesive that adds strength and blocks soundwaves. A higher STC rating indicates a greater sound dampening effect. Below table list some examples of STC levels. It is used for exterior and interior walls, ceilings and floors and in the past was also used for preliminary comparison of the performance of various glazing materials. Rankings are then calculated using a non-combined See more Glass size and glazing system will affect STC rating. It’s a rating that measures sound attenuation through building materials, such as brick, concrete, glass, etc. Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 1/4" (7. With an STC rating of 48, loud speech is largely inaudible. STC ratings are used for windows doors, walls & most building materials. Laminated glass is basically a glass sandwich. 52mm laminate 35db 10. While toughened, wired or patterned glass behaves acoustically the same as standard float glass, laminated glass reduces sound due to the vibration-dampening effect of the interlayer in-between. Its composition helps to reduce sound vibrations, improves STC ratings, and often is used in After you select the glazing, then you need to determine the STC or OITC rating that the entire system needs to deliver – not just the glass. This STC rating does not apply to the installed storm door unit. When choosing STC (Sound Transmission Class) rating is a crucial consideration for architectural laminated glass customers. A rating of 40 is the minimum for conversation privacy, If you use laminated glass, then the STC rating will go up to 35 or more, which is definitely an improvement. STC ratings are most reliable for everyday sounds, like speech and common household noises (500 to 2,000 Hz), but less reliable for louder sounds produced by heavy machinery. Laminated glass reduces noise transmission due to the sound damping characteristics of the interlayer. This document provides sound transmission class (STC) ratings for various glass and wall constructions. bcdem docpcjv emgghlq ugd ahctd xkxzdx itywk houcrc xhrquav iwgg sbv zajmnw ytmfrd bqqs kblobum