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Sealer (Adhesive) - Types and Use of Sealer
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Types and Use of Sealer |
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Sealers can be categorized according to their ingredients, applications, hardening types, functions or effectiveness. There are three kinds of sealers (adhesive) used for car manufacturing. One type is a structural use, used for adhering structural components together that need a strong adhesion.
The second type is a non-structural use, used for adhering interior upholsteries, and the third type is a quasi-structural use, used to fill-in clearances between the body component parts. | |
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For quasi-structural use sealer, there is a mastic sealer that is used for improving panel rigidity, preventing vibration and noise, and a body sealer that is effective for preventing entry of water, dust and wind. | |
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Used to adhere the hood, trunk, door and roof with outer panels. It not only joins them together, but also contributes to increased rigidity of the panels, helping to prevent vibration and noise form the outer panels.
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Body Sealer (Paint Sealer):
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Applied to part contact surfaces to prevent entry of water and dust. It also has a rust-prevention effect for the edges of steel sheets and is used to improve exterior appearance.
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Glass Sealer (Urethane-based Sealer):
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For glasses and other external parts (including the side protector), a urethane-based sealer that is hardened at room temperature is used.
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The automobile window glasses are attached with a method called direct glazing, which directly adheres the laminated glasses onto the painted body.
In this method, one-component moisture-curing polyurethane type adhesive is used. The adhesion surfaces are a ceramic coated glass and painted steel panel. To improve the adhesion, primer is applied on both surfaces.
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Spot Sealer (aka Weld-Through Primer):
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Used to prevent rust on the mating surfaces of spot welds.
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Significantly reduces the amount of passenger compartment road noise when applied to close off body cavities.
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Separators are installed in between the panels of mass produced vehicles. Foam is generated around the separators by heat during paint baking process fill up body cavities. Some newer models use expandable foam applied through the inner panel holes for this same purpose.
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