Glass Industry Terms – Everything You’ve Always Wanted to Know about Glass But Were Afraid to Ask
What is frit? Frit is an industry term for the paint that is applied around the perimeter of the motor vehicle glass parts. One of the key ingredients in frit is a glass ceramic particle that fuses to the glass surface making it a very durable and scratch resistant surface.
Why is frit (paint) on the glass? Frit serves two roles on bryanston glass the glass. First, it is a cosmetic feature that is used to hide interior trim and pinchweld details. Early model vehicles used wide moldings to unknown what would otherwise be exposed areas. As moldings became smaller to the point of nonexistence on several current models, the frit had a greater role in covering unfinished areas of your vehicle. Secondly, the frit inhibits UV degradation of urethane adhesives. While the frit will not completely block the Uv rays from passing through the glass, it does significantly reduce UV light transmission. Most urethanes are not UV stable. If urethane is left exposed to sunlight for prolonged periods, it will yellow and turn chalky. Presence of the frit will extend the duration of the urethane adhesive system.
How great diversity of frit are there? There are hundreds of types of frits developed for motor vehicle glass applications. The most common motor vehicle glass frits we use are black, dull and white although other colors are available. Frit pastes are developed to work in combination with the processing requirements needed for a specific part. Each stick is developed for the specific furnace time and temperature details used to fabricate parts at a manufacturing location. It is not uncommon for a glass manufacturing facility to work with a dozen different frit pastes.
How is frit applied to the glass? Frit is applied to the glass by using a cotton screen method. It is very similar to the method used to cotton screen T-shirts. An image of the frit design is developed for the glass in the bias or steep shape. Then the image is unwrapped and flattened. A cotton screen is made to allow the frit to pass through openings in the screen. The openings correspond to the final design image. The frit is a thick stick that is put onto the screen. Squeegees are used to push the frit stick through the screen openings and onto the glass. Frit is applied to the glass though it is in the flat position before it is processed through the furnace. The furnace helps to cure the frit and to merge it to the glass surface. Every part with each different design has a unique cotton screen. Cotton screens are constantly being maintained throughout the life of a part. Because of the fragile nature of the screens, they will exhaust and commonly need to be remade throughout the duration of a part in production.
What is Set glass? Set is a glass reference term that identifies a part of the manufacturing process. The raw components of glass are properly proportioned and mixed in batches for delivery to the furnace. Even though glass is made in a continual process that runs round the clock, every day of the year, the garbage are added as needed in batches. To state that a glass is set glass, it signifies that there’s no post manufacturing materials, i. e. a film or coating, applied to the glass. Set glass gets all its characteristics from the garbage that are used to make the glass. In the case of privacy or solar set glass, the dark colorants and UV inhibitors are mixed in with the original ingredients in the set to make the glass.
What is Float glass? Float glass refers to the glass manufacturing process. The raw components of glass are melted in a furnace between a temperature range of 240OF to 2850 F. A continual process is established as the molten glass is moved from the furnace to the tin bath where it is supported on molten tin before the glass cools from the slurry state to a temperature where the glass becomes solid. The float process was developed by Pilkington during fifties and is now considered the primary state of the art process for manufacturing motor vehicle and architectural glass.
What is the tin side and what is the air side of glass? As mentioned earlier, the float glass process involves suspended molten glass on. molten tin. The molten tin is smooth enough to give glass its flat surfaces. The tin and glass are like oil and water, they don’t mix. However, the medial side of glass that is in contact with tin during the float process does pick up a microscopic layer of tin. This is considered the tin side of float glass. The top side of glass is called the air or atmosphere side. To detect the tin side of glass, hold an UV light at an angle to the glass surface. The tin side will gleam and the air side will not.
What is Soft-Ray and what is Solar-Ray’? Soft-Ray and Solar-Ray are GM Art logos for the glass used in their vehicles. It identifies the type of glass used for construction and can appear on either laminated or tempered glass. LOF uses E-Z-Eye glass for the production of Soft-Ray parts and EZKool solar control glass for Solar-Ray parts. PPG uses Solex and Solar Green respectively. Deep Hue Solar-Ray is another GM trademark that appears on dark colored solar control parts.