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 vehicle glass parts. One of the key ingredients in frit is a glass ceramic particle bryanston glass that combines 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 incomplete areas of the auto. Secondly, the frit checks UV destruction 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 come across sunlight for prolonged periods of time, it will yellow and turn chalky. Presence of the frit will extend the lifetime of the urethane adhesive system.

How many types of frit are there? There are hundreds of types of frits developed for vehicle glass applications. The most common vehicle glass frits we use are black, overcast 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 sauce is developed for the specific furnace time and temperature boundaries used to fabricate parts at a manufacturing location. It is not uncommon for a glass factory to work with 12 different frit pastes.

How is frit applied to the glass? Frit is applied to the glass with a a silk duvet screen method. It is very similar to the method used to a silk duvet screen T-shirts. An image of the frit design is developed for the glass in the misshapen or tendency shape. Then the image is unwrapped and squashed. A a silk duvet screen is enabled to allow the frit to pass through openings in the screen. The openings correspond to the final design image. The frit is a thick sauce that is put onto the screen. Squeegees are used to push the frit sauce through the screen openings and onto the glass. Frit is applied to the glass while 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 a silk duvet screen. A silk duvet screens are constantly being maintained throughout the life of a part. Because of the fragile nature of the screens, they will wear out and commonly need to be remade throughout the lifetime of a part in production.

What is Plate glass? Plate 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 convey that a glass is plate glass, it shows that there is not any post manufacturing materials, i. e. a film or coating, applied to the glass. Plate glass gets all its characteristics from the raw materials that are used to make the glass. In the case of privacy or solar plate glass, the dark colorants and UV inhibitors are mixed in with the original ingredients in the plate to make the glass.

What is Drift glass? Drift glass refers to the glass manufacturing process. The raw components of glass are melted in a furnace between a temperature choice of 240OF to 2850 F. A continual process is established as the molten glass is moved from the furnace to the container bath where it is supported on molten container through to the glass cools from the slurry state to a temperature where the glass becomes solid. The drift process was made by Pilkington during 1950’s and is now considered the primary state of the art process for manufacturing vehicle and industrial glass.

What is the container side and what is the air side of glass? As mentioned earlier, the drift glass process involves going molten glass on. molten container. The molten container is smooth enough to give glass its flat surfaces. The container and glass are like oil and water, they don’t mix. However, the side of glass that is in contact with container during the drift process does pick up a microscopic layer of container. This is the container side of drift glass. The top side of glass is called the air or atmosphere side. To detect the container side of glass, hold an UV light at an angle to the glass surface. The container side will ambiance 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 brand that appears on dark colored solar control parts.

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