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Annealed, Tempered, and Chemically Strengthened Glass - What's The Difference?

Learn about the difference between annealed, tempered, and chemically strengthened glass. I explain each one and how it impacts the optical properties of glass, specifically first surface mirrors, beamsplitter mirrors, and anti-reflective glass. Every week, we bring our subscribers new lessons based off of our expertise in the optical glass and mirrors. If you’d like to learn more about our products, you can find a lot more information on our website twowaymirrors.com Glass is used all around us in our everyday lives. Our cups, lightbulbs, car windows, phone screens, and even skyscrapers are composed of glass, but is it all the same? Glass is produced and treated in many different ways depending on what it is going to be used for. Let’s start by talking about annealed glass, also known as standard or float glass. The term “annealed” is generally referring to the cooling process of the glass. Once limestone, soda ash, and several other things are melted at 2,700 degrees fahrenheit, the liquid mixture is floated on a pool of molten tin. This is where the term “float glass” comes from! After this process, the glass is slowly cooled and stretched, which helps reduce internal stress that could cause breakage. When glass is annealed properly, it’s less prone to shattering or breaking. This being said though, annealed glass is thin and flexible enough that it can be cut, drilled, polished, or whatever else you may need to do to it without breaking. If and when annealed glass DOES break, it can shatter into long sharp pieces, which is why annealed glass isn’t known as safety glass. I’ll go over the benefits of tempering and laminating glass to improve safety. When it comes to optical mirrors, both glass first surface mirrors and dielectric beamsplitter mirrors are typically supplied as annealed. They score and break just like standard glass and no further safety is needed. Additionally, annealed glass is extremely flat which makes it ideal for making mirrors without distortion. Next we have tempered glass. Tempered glass is most commonly used in car windows, shower doors, screen protectors for your smartphone, and is even a component in bulletproof glass. It is also known as safety glass. Tempered glass starts off as annealed glass. Before you put the glass into the furnace to be tempered you need to cut down the glass to the exact size you need. Then it is put into a tempering furnace. At the end of the process it is blasted with cool air in a process called quenching. This causes the outer layer to cool quicker than the inner layer, which causes tension within the glass, making it 10 times stronger. Because of the tension within the tempered glass, it cannot be cut or drilled without shattering it entirely. That is why you need to cut it to the size you need before tempering it. It’s common for us to supply tempered anti-reflective glass and beamsplitter mirrors for applications where the optical properties are not as crucial as the safety factor. Anti-reflective glass is commonly used in science & engineering, museums, storefronts, display cases, architecture, and luxury homes. Tempered beamsplitter mirrors are used for digital signage mirrored displays, pepper’s ghost theater productions, and for mirror illusions in public spaces. // QUESTIONS // Leave us a comment below or shoot us an email! // SUBSCRIBE // http://www.youtube.com/subscription_c... 🤗Parts for a DIY Teleprompter: 🤗 16"x16" Beamsplitter Mirror w/Rounded Corners https://telepromptermirror.com/glass- Neewer Heavy Duty Light Stand https://amzn.to/3rV8yKf Neewer 15 Pieces 1/4" 3/8" Metal Threaded Screw Converter Adapter https://amzn.to/3rTgmvX Nikon 7070 Binocular Window Mount https://amzn.to/3cSvXGb Laptop Tray (On-Stage MSA5000) https://amzn.to/3cErVAN Tray Attachment (On-Stage MSA9508) https://amzn.to/3eJ8Z6P Tray Adapter (On-Stage Music Accessory (MM01)) https://amzn.to/30OmjOZ Table for Larger Screens (PylePro PLPTS2) https://amzn.to/3lpYdUq Phone Clamp (That Rotates) https://amzn.to/3rP8jjU 😏Studio Tools:😏 Canon 1DX Mark III - https://amzn.to/3eQQihH Canon Ultra Wide Angle Zoom Full Frame Lens - https://amzn.to/3vtFGLn Drones - DJI Inspire 2 Done - https://amzn.to/3eFu2XU DJI Spark, Portable Mini Drone, Alpine White - https://amzn.to/3vraRqR DJI Zenmuse X5S Camera for DJI Inspire 2 - https://amzn.to/3to5Mxy Corsair Pro used for Video Editing - https://amzn.to/3rUHLOn Neewer Mono Microphone for Camcorder and DSLR Camera - https://amzn.to/2QbUFJO Neewer Heavy Duty Light Stand for Video - https://amzn.to/3eHuQeV Epidemic Sound: https://www.epidemicsound.com/referra... Gimbal - https://amzn.to/3qMa0xi DJI Mobil 2 Handheld Smartphone Gimbal - https://amzn.to/3tuk2EO