Understanding Glass Coatings and Insulated Glass Units IGUs
Glass Coatings and IGUs: What Changes for Vacuum Handling?
A glass pane can be coated, heat-treated and laminated before it becomes part of an insulating glass unit. These descriptions are useful, but they answer different questions. None of them, on its own, specifies the suction cup needed to move the workpiece.
For vacuum handling, begin with the glass that the equipment will actually contact: its surface, geometry, mass and condition at that stage of production. Then consider the movement and machine mounting. The distinctions below help turn a glazing description into usable handling information.
Glass labels describe different properties
| Descrição | What it tells you | What still needs to be established |
|---|---|---|
| Vidro revestido | A surface carries a functional coating. | Exact product, coating position and permitted contact and processing. |
| Heat-treated glass | The glass has undergone a specified heat-treatment process. | Dimensions, shape, contact condition and approved handling arrangement. |
| Vidro laminado | Glass layers are bonded with an interlayer. | Complete build-up and mass, external contact surface and processing stage. |
| Insulating glass unit (IGU) | Panes are separated and sealed around one or more cavities. | Each pane’s specification and the completed unit’s handling requirements. |
| Tinted, patterned or curved glass | Colour, surface geometry or overall shape differs. | Whether the actual contact face can support the selected vacuum interface. |
The labels can overlap. A coated laminated pane may be one component of an IGU; a finished unit may contain different pane thicknesses. Keep the full build-up on the drawing rather than reducing it to one product category.
Coating type does not determine every processing step
Pyrolytic and sputtered coatings are produced by different methods, but processing permission still belongs to the exact glass product. It is too broad to say that all sputtered coatings can only be cut or that they cannot be heat-treated.
For example, Şişecam’s processing guideline for heat-treatable coated glass includes thermal-treatment requirements. AGC’s Version 4.5 magnetron-coating guide distinguishes products with different heat-treatment requirements. Follow the applicable product instructions instead of assigning a universal process limit to the coating category.
Low-E and solar-control descriptions also do not identify an approved suction-cup contact face. Confirm the manufacturer’s product name, the supplied version and the coating position before selecting a contact material.
Read the complete IGU build-up
An insulating glass unit contains two or more panes separated by sealed cavities. A double-glazed unit and a triple-glazed unit therefore need different build-up descriptions. A laminated component can add further glass layers within one pane position.
Specify pane thicknesses, cavity widths, coatings, laminate details and gas filling where applicable. Thermal performance should come from the declared or assessed construction. Increasing cavity width is not a rule that guarantees better insulation, and acoustic performance should not be inferred simply from the word “IGU”.
For handling, distinguish the individual panes entering the line from the completed unit leaving it. This is particularly useful for conventional and thin-center-pane triple glazing. A description of the finished unit is not enough to approve the station that moves its thinnest pane.
Laminated glass does not automatically require a bellows cup
The interlayer sits within the laminate. The suction cup normally contacts an accessible outside surface, whose coating, flatness, cleanliness and geometry still need to be identified.
A flat, oval or bellows design should be considered in relation to that contact surface, the required positioning behaviour and the machine. The presence of an interlayer does not, by itself, prove that a flexible bellows cup is the right choice.
For an existing cutting line, use the laminated-glass cutting application and supply the installed part reference, dimensions and mounting details. Matching the outline alone leaves material, profile and installation questions unresolved.
Contact permission, surface quality and holding performance belong together
A clean surface is important, but it does not override a coating manufacturer’s restrictions. Identify which face is contacted before and after each operation, including any surface that will later be enclosed.
A cover may provide a useful interface on a suitable cup and workpiece. Its fit, retention, effect on holding performance and surface result still need assessment. A soft material, a “non-marking” label or a dimensional match is not universal approval for coated glass.
Use the Low-E contact review before IGU assembly for the detailed workflow and manufacturer-source scopes. Use the MTC cover page to review candidate dimensions and the information needed for an application enquiry.
Choose the next step by the task
- For a production station, go to IGU line suction cups or the glass processing applications.
- For a component comparison or replacement, go to industrial glass suction cups.
- For factory lifting of complete workpieces, go to glass vacuum lifters.
- For the connection between performance requirements and manufacturing, browse the glass manufacturing guides.
When sending an enquiry, include the full workpiece description, maximum and minimum dimensions, mass, contact face, handling direction and current equipment. Add drawings and photographs where available. These details are more useful for selection than a glass label alone.
Discuss your glass workpiece and handling task
Technical sources reviewed on 5 November 2026. Product-specific processing instructions remain the reference for the glass supplied.