Low-E coated, argon-filled double glazed units for thermal and acoustic insulation. ECBC 2017 compliant. 12,500 sqm/month capacity, processed in Bangalore.
Karnataka Metal Company assembles double glazed glass (also called DGU or insulated glass units) at its Nelamangala plant in Bangalore with 12,500 sqm/month capacity and Low-E coatings for ECBC 2017 compliance. For a detailed comparison of all glass types, read our glass selection guide.
Karnataka Metal Company processes double glazed glass in multiple configurations based on glass type, coating, and gas fill.
The inner pane is always clear; the outer pane can be clear, tinted, soft coat, or hard coat, separated by a dehydrated air cavity. U-value varies by combination. Cost-effective for residential and light commercial applications.
Low-E coated panes with argon gas fill; U-value below 2.0 W/sqm.K.
Combines DGU insulation with acoustic laminated glass for superior sound reduction. For buildings near airports, highways, and dense urban areas.
Karnataka Metal Company processes toughened glass in-house, offers laminated glass through quality-tested service providers, and supplies aluminium framing sections and profiles for curtain wall and window systems, all from a single source in Bangalore.
| Configuration | U-value (W/sqm.K) | SHGC | VLT | Best For |
|---|---|---|---|---|
| Clear + Air + Clear | 2.7 to 2.8 | 0.70 to 0.75 | 0.75 to 0.80 | Residential, light commercial |
| Tinted + Air + Clear | 2.7 to 2.8 | 0.45 to 0.55 | 0.40 to 0.60 | Solar control without coating (lower SHGC, less glare) |
| Clear + Argon + Low-E (Soft Coat) | 1.6 to 1.8 | 0.25 to 0.40 | 0.55 to 0.70 | ECBC compliant commercial |
| Clear + Argon + Low-E (Hard Coat) | 1.8 to 2.0 | 0.35 to 0.50 | 0.60 to 0.72 | Moderate performance, exposed edges |
| Clear + Argon + Double Silver Low-E | Below 1.6 | 0.20 to 0.27 | 0.35 to 0.55 | Maximum solar control, hot climates |
| ECBC Parameter | Requirement | How DGU Meets It |
|---|---|---|
| U-factor (thermal) | Less than or equal to 3.0 W/sqm.K (lower means better insulation) | Standard DGU achieves 2.7 to 2.8; Low-E DGU achieves below 2.0 |
| SHGC (Solar Heat Gain Coefficient) | Less than or equal to 0.27 (lower means less solar heat enters) | Double Silver Low-E DGU achieves 0.20 to 0.27 |
| VLT (Visible Light Transmittance) | Greater than or equal to 0.27 (higher means more natural light) | All DGU configurations meet this requirement |
| Energy Star / GRIHA / IGBC | Points awarded for glazing performance | Low-E DGU contributes to green building certification |
| Dimension | Specification |
|---|---|
| Maximum DGU size | 3,600 x 1,950 mm |
| Maximum total unit thickness | Up to 50mm |
| Standard spacer widths | 6, 8, 10, 12, 14, 15, 16, 18, 24, 27mm |
| Gas cavity options | Dehydrated air (standard, kept dry by desiccant in the spacer), Argon gas (enhanced performance) |
| Minimum order | No rigid minimum; single unit to full project quantities |
| Process | Capability | Notes |
|---|---|---|
| DGU assembly | Robotic sealing system | Spacers fixed manually; robotic sealant application and edge sealing |
| Low-E coating options | Soft Coat (sputtered), Hard Coat (pyrolytic), Double Silver Low-E | Lowers U-value and solar heat gain (SHGC) |
| Gas filling | Argon gas injection | Reduces thermal conductivity of the gas cavity by approximately 34% vs air |
| Spacer type | Aluminium spacer | Aluminium spacer bar maintains a uniform cavity and houses the desiccant that keeps the gas dry |
| Toughened DGU panes | In-house tempering, 25,000 sqm/month | One or both DGU panes can be toughened for safety compliance |
| Laminated DGU panes | Lamination through quality-tested service providers | For acoustic DGU or overhead DGU requiring safety glazing |
| Quality testing | GASP, Merlin Lazer | GASP: Stress testing, Merlin Lazer: measures the thickness of the DGU, Manual tests: for seal integrity, Butterfly test: to test the sealant mixing, Other: Bow and edge lift tests |
Double glazing is specified wherever thermal insulation, energy efficiency, or acoustic performance is required. In India's hot climate, DGU with Low-E coating is the most effective way to meet ECBC 2017 requirements.
Our DGU line uses a robotic sealing system: spacers are fixed manually, then the robot applies the sealant and seals each unit. Robotic sealing ensures consistent seal integrity and reduced risk of argon gas leakage.
We process DGU with Soft Coat (sputtered), Hard Coat (pyrolytic), and Double Silver Low-E options. Every Low-E type available to match your project's ECBC, SHGC, and VLT requirements.
Both panes of a DGU can be toughened in-house, with lamination handled through quality-tested service providers. Our tempering produces some of the flattest glass in the industry, reducing the risk of bubbles and delamination in the finished product.
Equipment includes GASP (non-destructive stress testing), Merlin Lazer, and seal integrity testing. Every DGU batch verified for thermal performance, seal quality, and optical clarity before dispatch.
Source your double glazed units and aluminium profiles for curtain wall mullions, transoms, and window frames from a single supplier. One purchase order, one delivery schedule, less coordination on site.
We supply the Low-E DGU configuration specified for your energy target and pass on the glass manufacturer's (Guardian, Asahi, Saint Gobain) published thermal performance data, including U-value, SHGC, and VLT figures, for your ECBC 2017 and IGBC/GRIHA certification submissions.
Looking for double glazed glass suppliers in Bangalore? Contact us for Low-E coating selection and project-specific DGU glass pricing. Processed double glazed units delivered to your project site across South India.
