What is frit? Frit is an industry term for the paint that is applied around the perimeter of the car glass parts. One of the key ingredients in frit is a glass ceramic particle bryanston glass that joins 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 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 obscure 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 not finished areas of the car. Secondly, the frit suppresses UV wreckage 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 confronted with sunlight for prolonged time frames, it will yellow and turn chalky. Presence of the frit will extend the lifetime of the urethane adhesive system.
How a number of frit are there? There are hundreds of types of frits developed for car glass applications. The most common car glass frits we use are black, greyish 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 gravy is developed for the specific furnace time and temperature variables used to fabricate parts at a manufacturing location. It is not uncommon for a glass manufacturing unit to work with several different frit pastes.
How is frit applied to the glass? Frit is applied to the glass running a egypt screen method. It is very similar to the method used to egypt screen T-shirts. An image of the frit design is developed for the glass in the tendency or curled shape. Then the image is unwrapped and compressed. A egypt screen was created to allow the frit to pass through openings in the screen. The openings correspond to the final design image. The frit is a thick gravy that is put onto the screen. Squeegees are used to push the frit gravy through the screen openings and onto the glass. Frit is applied to the glass even as it is in the flat position before it is processed through the furnace. The furnace helps to cure the frit and to fuse it to the glass surface. Every part with each different design has a unique egypt screen. Egypt screens are constantly being maintained throughout the life of a part. Because of the fragile nature of the screens, they will tire and commonly need to be remade throughout the lifetime of a part in production.
What is Group glass? Group 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 24×7, every day of the year, the raw materials are added as needed in batches. To mention that a glass is group glass, it demonstrates there is not any post manufacturing materials, i. e. a film or coating, applied to the glass. Group glass gets all its characteristics from the raw materials that are used to make the glass. In the case of privacy or solar group glass, the dark colorants and UV inhibitors are mixed in with the original ingredients in the group to make the glass.
What is Move glass? Move glass refers to the glass manufacturing process. The raw components of glass are melted in a furnace between a temperature array of 240OF to 2850 F. A continual process is established as the molten glass is moved from the furnace to the jar bath where it is supported on molten jar so that the glass cools from the slurry state to a temperature where the glass becomes solid. The move process was created by Pilkington during 1950’s and is now considered the primary state of the art process for manufacturing car and system glass.
What is the jar side and what is the air side of glass? As mentioned earlier, the move glass process involves hovering molten glass on. molten jar. The molten jar is smooth enough to give glass its flat surfaces. The jar and glass are like oil and water, they don’t mix. However, the side of glass that is in contact with jar during the move process does pick up a microscopic layer of jar. This is definitely the jar side of move glass. The top side of glass is called the air or atmosphere side. To detect the jar side of glass, hold an UV light at an angle to the glass surface. The jar side will sparkle and the air side will not.
What is Soft-Ray and what is Solar-Ray’? Soft-Ray and Solar-Ray are GM Trademarks 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 Tint Solar-Ray is another GM hallmark that appears on dark colored solar control parts.