Sag bending is a glass processing method that involves heating the glass to a specific temperature and then bending it to a desired shape using a mold. For laminated windshields, this process is done at a lower temperature range to prevent the plastic interlayer from melting or degrading. Typically, the sag bending process is done at around 550-630°C for a few minutes until the glass reaches the desired shape. The exact temperature range and duration of the process can vary depending on the specific type of glass and the desired shape.

What is Sag Bending

What is Sag Bending

During sag bending, an enamel paint is used to help maintain the glass’s shape. This type of paint can adhere to the glass at the temperature at which it is shaped in the mold and hardens as it cools. Enamel paint is typically applied to the glass surface using a serigraphic printing process. The thickness of the enamel layer can vary depending on the thickness and shape of the glass being processed. However, the enamel layer is generally around 27-40 microns thick.

After being sag bent, glass is chemically toughened and laminated.

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Tailored to meet essential requirements, our heavy metal-free enamels for automotive glass sag bending processing offer a broad firing range, superior gloss, optimal opacity, and the deepest possible shade of black.