Back-painted glass is glass coated with paint on its rear face, so the visible side remains a clean, durable glass surface. AGC’s glossy Lacobel T and satin/matt Matelac T ranges add a heat-treated option for specified interior and exterior applications, while the non-T Lacobel and Matelac ranges are identified as interior products.
The finish is only one design decision. A successful installation also depends on the exact application, substrate, heat-treatment sequence, permitted lamination, fixing method, water control and local product availability. Treat AGC’s named uses as manufacturer-identified applications, not automatic approval for every wall, façade or door assembly.
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What back-painted glass is and why the face looks different
In a back-painted panel, an opaque or translucent coating is applied to the face that will sit against the wall, frame or substrate. The opposite face is ordinary glass, so the viewer sees depth, reflection and a smooth surface rather than brush marks or exposed paint. The coating is protected by the glass during normal use, which is why the material can give a painted-color effect with a more architectural, reflective appearance.
AGC’s product description separates the visible effects into two families:
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- Lacobel T: a glossy surface with strong reflections and a polished appearance.
- Matelac T: a matt or satin surface that diffuses reflections and reads softer.
The 2017 Building Design + Construction article by Elizabeth Cotton, then AGC Glass North America’s Product Manager – Interior & Specialty Products, presents these benefits in a manufacturer-authored, promotional context. Its comments about durability, maintenance, low VOC emissions and Cradle to Cradle Bronze certification should not be treated as current, independent test results without checking the documentation for the product and market being specified.
There is no reliable, current color-count statistic established here. A statement in that 2017 article about ten colors describes a historical range, not a number that can be assumed for today’s catalog or for every country.
Which AGC range fits the project?
The letter “T” matters. AGC’s overview distinguishes interior-only Lacobel and Matelac from Lacobel T and Matelac T, which are heat-treated lines described for indoor and outdoor applications. The table below is a selection aid, not a substitute for an AGC specification or building-code review.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware match| Range | Appearance | Heat treatment and location | Uses identified by AGC |
|---|---|---|---|
| Lacobel | Glossy | Interior range; do not assume exterior suitability | Interior decorative surfaces, subject to the product specification |
| Matelac | Matt/satin | Interior range; do not assume exterior suitability | Interior decorative surfaces, subject to the product specification |
| Lacobel T | Glossy | Heat-treated; described for indoor and outdoor applications | Spandrels, splashbacks, wall cladding and other specified assemblies |
| Matelac T | Matt/satin | Heat-treated; described for indoor and outdoor applications | Spandrels, splashbacks, wall cladding and other specified assemblies |
AGC also identifies furniture, partitions, doors and façade cladding as applications in its product materials. Those labels indicate where the manufacturer sees the products being used; they do not establish that a particular thickness, fixing detail or local code accepts every one of those applications.
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Use Lacobel T when reflections and a high-gloss color field are part of the design. Choose Matelac T when glare control and a quieter, satin appearance are more important. Samples should be viewed under the project’s actual lighting: a matt face changes how bright points are scattered, while a glossy face can mirror windows, luminaires and movement.
Choose by the assembly, not by the color name alone
For a splashback, wall lining or furniture panel, confirm the substrate, support spacing, edge exposure and cleaning regime. For a spandrel or façade, confirm what sits behind the glass, how opacity is achieved and how the panel is drained and ventilated. An exterior installation requires the specific AGC fitting guidance for that configuration; the fact that a product is in a “T” range is not, by itself, an approval of your façade design.
Where the products can be used
Interior walls and coverings
AGC’s 2021 technical guide lists wall coverings among interior uses for Lacobel T and Matelac T. The glass can create a continuous color plane in lobbies, kitchens, bathrooms and retail interiors, provided the fixing system keeps water away from the painted side and prevents moisture from reaching the rear of the panel.
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The same guide names table tops and shelves. Design the support so loads are transferred without point stresses that exceed the glass specification. Edge treatment, corner radii and any holes must be agreed before tempering, because they cannot be added safely after the panel has been toughened.
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Doors, partitions and display cases
Fixed and sliding doors, partitions and display cases are listed interior applications. The hardware supplier and glass processor must coordinate clearances, holes, notches and edge protection. A door schedule should identify whether the painted face is exposed to a wet cleaning process or to standing water; permanent water exposure on that face is not permitted under AGC’s guidance.
Splashbacks
Splashbacks are a named application for the T lines. Seal junctions and penetrations so water cannot migrate behind the glass. A splashback beside a sink, hob or commercial wash area needs a detail that addresses movement, heat, cleaning chemicals and the joint between glass and worktop; do not rely on the paint layer as a waterproofing membrane.
Spandrels and wall cladding
AGC identifies spandrels and wall cladding among T-line uses. The brochure describes exterior spandrels on an opaque substrate and exterior wall cladding as possibilities. Confirm the exact substrate, cavity, drainage, wind loads, thermal movement, glass thickness, color and attachment method with AGC and the project engineer. Exterior use is a special installation case, not a generic extension of an interior detail.
Fabrication: the sequence that prevents irreversible errors
Heat treatment changes what can be done to the pane. AGC’s technical guide states: Any cutting, drilling and edge finishing must be done prior to tempering.
The processor should therefore freeze the fabrication drawing before the furnace stage.
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- Approve the design and dimensions. Confirm finished size, tolerances, visible edges, corner radii, holes, notches, cut-outs, labels and orientation of the painted face.
- Cut the glass. Straight and circular cuts are made before heat treatment. Check the template against the frame or substrate before proceeding.
- Finish the edges. Grinding and polishing requirements, including exposed edges, must be completed at this stage.
- Drill and notch. All hardware holes, slots and notches are produced before toughening. Their size and distance from edges must follow the processor’s limits for the selected thickness.
- Apply the specified paint and inspect it. Confirm color, opacity, orientation and any translucent effect. Crisp White is slightly translucent; AGC recommends Cool White instead where silicone fixing points could otherwise show through.
- Toughen in the required furnace. The manufacturer brochure states that toughening in a convection furnace is mandatory for these products. The processor should record the approved product, thickness and heat-treatment route.
- Laminate only as permitted. AGC lists PVB lamination options but specifies different permitted sides for Lacobel T and Matelac T. The processor must follow the current product guide rather than applying a generic laminated-glass assumption.
Once a pane has been tempered, drilling, cutting or edge reworking is not a field correction. If a hole is missing, the practical remedy is usually to remake the panel, not modify it on site.
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AGC describes two broad approaches: silicone adhesive and mechanical or point fitting. The choice affects the visible appearance, load transfer, movement allowance, serviceability and water control.
Silicone fixing
Use only a silicone system and color accepted for the product and application. The technical guide includes restrictions on silicone products and colors. Where a fixing point may be visible through a slightly translucent color, Cool White is preferred to Crisp White. The installer must prepare the substrate, apply the bead at the specified geometry and allow the adhesive to cure without trapping contamination or water.
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Mechanical and point fittings
Mechanical clips, channels and point fittings require accurately positioned holes and edge details made before tempering. Hardware should be isolated from damaging contact, allow for movement where required and avoid concentrating loads at a corner or unsupported edge. Obtain the fitting dimensions and load limits from the current AGC and hardware instructions.
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Water control
The painted side must not be permanently exposed to water, and water must not get behind the glass. This requirement governs more than the final bead of sealant: detail the perimeter, joints, penetrations, substrate, drainage path and cleaning practices. In wet rooms and exterior walls, provide a designed path for incidental moisture rather than sealing a cavity that can trap it.
Project workflow: checks to complete before ordering
- Define the visual target. Record gloss versus matt/satin, color, opacity and whether reflections are acceptable under daylight and artificial lighting.
- Classify the location. Mark each panel as interior or exterior and identify whether it is a wall covering, splashback, door, partition, table, shelf, display case, spandrel or cladding panel.
- Confirm the assembly. Identify the substrate, backing, cavity, support spacing, edge exposure, drainage and movement joints. For spandrels, state how the opaque backing is formed.
- Issue a fabrication drawing. Freeze all cuts, holes, notches, edge finishes, dimensions and orientation before the processor starts.
- Choose the fixing method. Obtain approval for silicone type and color or for the mechanical hardware. Check whether any fixing point could show through the selected color.
- Check lamination and heat treatment. Verify the product-specific PVB side, furnace requirement and processor capability.
- Verify regional supply. Ask an AGC representative or certified processor to confirm the current market, color, thickness and dimension availability. Brochure ranges should not be treated as local stock lists.
- Coordinate inspection and cleaning. Agree how the glass will be protected during construction, how sealant residue will be removed and which cleaning products are allowed.
Common failure modes and practical fixes
| Problem | Likely cause | Preventive action |
|---|---|---|
| Hole or cut-out is in the wrong place | Dimensions changed after tempering | Approve the final fabrication drawing before cutting and drilling; remake rather than modify toughened glass. |
| Silicone dots or beads are visible | Translucent color or unsuitable silicone color | Review a sample under project lighting and consider Cool White where AGC recommends it. |
| Painted back shows moisture damage | Permanent water exposure or water trapped behind the pane | Redesign perimeter, joints and drainage; keep the painted side dry in service. |
| Exterior panel performs unpredictably | Interior detail reused outdoors without project-specific guidance | Obtain AGC’s exterior fitting instructions and coordinate the façade engineer, substrate and attachment system. |
| Specified color or size cannot be supplied | Assumed brochure range equals local inventory | Check market-specific availability with a local AGC representative or certified processor before finalizing the schedule. |
Maintenance and handover
The exposed face is glass, so routine care should use the cleaning method approved for the product and installation. Protect panels from cement, grout, abrasive dust and metal swarf during construction; these contaminants can scratch or stain even when the paint is safely behind the glass. Keep labels on the panels until orientation and inspection are complete, then remove residue with the approved method rather than scraping the surface.
Handover documentation should identify the product range, color, thickness, processor, fixing system, sealants and cleaning instructions. Record which face is painted and where access panels or joints require periodic inspection. For exterior work, include the drainage and replacement strategy so a damaged pane can be replaced without improvising a new fixing detail.
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AGC’s published material supports the gloss-versus-satin distinction, the heat-treated T ranges, the pre-tempering fabrication sequence, silicone and mechanical fixing options, and the broad application list. It does not establish your local stock, project price, current color catalog, available dimensions or the suitability of a particular assembly under local regulations.
The safest specification is therefore conditional: select the appearance first, then have a certified processor and local AGC representative confirm the exact product, thickness, color, dimensions, heat treatment, lamination, fixing and installation guidance for the project’s market and exposure.
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