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Low-E storefront glass – low-emissivity coated glass panels for energy-efficient retail storefronts, shop windows and commercial entrances. Passive Low-E (hard coat) for cold climates retaining interior heat; Solar-Control Low-E (soft coat) for hot climates rejecting solar heat. Available on clear, low-iron and tinted substrates in tempered, laminated and IGU configurations. U-values from 1.0 W/m²K (double Low-E argon) to 0.5 W/m²K (triple Low-E krypton). Manufactured to EN 1096, EN 673, ASTM C1376 and applicable building energy codes. Factory-direct B2B supply for glazing contractors, facade engineers and energy-conscious retail developers. Request FOB quote for your Low-E storefront glass project.
Low-Emissivity Coated Glass for Energy-Efficient Retail Storefronts, Shop Windows & Commercial Entrances – Passive Heat Retention, Solar Heat Rejection, Year-Round Energy Savings
Low-E storefront glass (low-emissivity coated glass) has a microscopically thin metallic oxide coating applied to the glass surface that selectively controls the transmission of radiant heat energy. The coating reflects long-wave infrared radiation (heat) while allowing short-wave visible light to pass through – effectively trapping interior heat in winter while rejecting solar heat in summer, depending on the coating type selected.
For glazing contractors, facade engineers, energy consultants, retail developers, architects, and procurement managers supplying the European, North American, Australian and global commercial construction market, Low-E storefront glass represents the active thermal performance layer within an insulating glass unit – the coating technology that transforms a standard double-glazed unit into a high-performance energy-saving assembly.
💡 Why Low-E coating matters for storefronts: A retail storefront is a large vertical expanse of glass that acts as a thermal bridge between interior and exterior environments. Without Low-E coating, even a double-glazed unit loses significant heat through radiative transfer – the warm interior surface radiates heat to the cold glass, which then conducts it outside. Low-E coating blocks this radiative heat transfer by reflecting long-wave infrared radiation back into the building. The result: (1) interior glass surface stays warmer in winter, reducing condensation and improving comfort, (2) heating energy consumption drops by 30–50% compared to uncoated double glazing, (3) in summer, solar-control Low-E reflects solar infrared radiation, reducing cooling loads, and (4) UV transmission is reduced by up to 99%, protecting displayed merchandise from fading.
Low-E coated glass is available in two primary families – Passive (Hard Coat) and Solar-Control (Soft Coat) – each suited to different climate zones and performance objectives.
This comparison helps procurement managers understand the value of investing in Low-E coating.
| Feature | Low-E Storefront Glass | Uncoated Storefront Glass |
|---|---|---|
| U-value (double IGU) | 0.8–1.4 W/m²K | 2.7 W/m²K |
| Winter heat loss reduction | 30–50% vs uncoated double | Baseline |
| Summer cooling load reduction | 20–40% (solar-control type) | Baseline |
| Interior surface temperature (winter) | Warmer – less condensation | Colder – condensation prone |
| UV transmission | <1% (solar-control) | ~60% |
| Merchandise protection | ✅ Excellent – reduced fading | ❌ Poor |
| Cost premium vs uncoated IGU | +15–30% | Baseline |
| Payback period | 2–5 years (energy savings) | N/A |
| Application | Recommendation | Reasoning |
|---|---|---|
| New-build retail (most jurisdictions) | Low-E required | Energy codes mandate minimum U-value |
| Cold climate (heating dominated) | Passive Low-E | Maximise heat retention |
| Hot climate (cooling dominated) | Solar-control Low-E | Reduce cooling load |
| Sun-exposed west/south façade | Solar-control Low-E | Prevent overheating |
| Luxury retail with valuable merchandise | Solar-control Low-E | UV protection for goods |
| Budget-sensitive project (mild climate) | Uncoated acceptable | Lower upfront cost |
SUNLIGHT (Visible + IR) INTERIOR HEAT (Long-Wave IR)
│ │
▼ ▼
┌──────────────────────────────────────────────────────────┐
│ OUTER PANE │
├──────────────────────────────────────────────────────────┤
│ Low-E COATING LAYER │
│ ┌────────────────────────────────────────────────────┐ │
│ │ Reflects long-wave IR back into building (winter) │ │
│ │ Reflects solar IR away from building (summer) │ │
│ │ Passes visible light through │ │
│ └────────────────────────────────────────────────────┘ │
├──────────────────────────────────────────────────────────┤
│ GAS-FILLED CAVITY │
├──────────────────────────────────────────────────────────┤
│ INNER PANE │
└──────────────────────────────────────────────────────────┘| Property | Passive Low-E (Hard Coat) | Solar-Control Low-E (Soft Coat) | Dual/Triple Silver Low-E |
|---|---|---|---|
| Coating method | Pyrolytic (applied during float process) | Magnetron sputtering (applied after cutting) | Magnetron sputtering |
| Position in IGU | Surface #2 or #3 | Surface #2 | Surface #2 |
| Durability | ✅ Can be tempered, handled | ❌ Must be protected within IGU | ❌ Must be protected |
| U-value (double argon) | 1.0–1.4 W/m²K | 0.8–1.1 W/m²K | 0.6–0.9 W/m²K |
| SHGC range | 0.55–0.70 | 0.25–0.45 | 0.25–0.40 |
| VLT range | 70–80% | 60–75% | 55–70% |
| Selectivity (VLT/SHGC) | ~1.1 | ~1.5–2.0 | ~1.8–2.2 |
| UV rejection | ~70% | ~99% | ~99% |
| Best for | Cold climates | Hot/mixed climates | Premium performance |
| Surface Number | Position | Typical Coating |
|---|---|---|
| Surface #1 | Outer face of outer pane | Rarely coated (cleaning exposure) |
| Surface #2 | Inner face of outer pane | Most common – Solar-Control Low-E |
| Surface #3 | Inner face of inner pane | Passive Low-E (hard coat) |
| Surface #4 | Interior face of inner pane | Rarely coated |
| Configuration | Coating | Gas Fill | U-value (EN 673) | U-value (ASHRAE) |
|---|---|---|---|---|
| Double IGU | None | Argon | 2.7 W/m²K | 0.49 BTU/h·ft²·°F |
| Double IGU | Passive Low-E | Argon | 1.2 W/m²K | 0.28 BTU/h·ft²·°F |
| Double IGU | Solar-Control Low-E | Argon | 1.0 W/m²K | 0.25 BTU/h·ft²·°F |
| Double IGU | Dual-Silver Low-E | Argon | 0.8 W/m²K | 0.22 BTU/h·ft²·°F |
| Triple IGU | Dual Low-E | Argon | 0.7 W/m²K | 0.18 BTU/h·ft²·°F |
| Triple IGU | Triple Low-E | Krypton | 0.5 W/m²K | 0.15 BTU/h·ft²·°F |
| Coating Type | SHGC | VLT | Selectivity | Best Climate |
|---|---|---|---|---|
| No coating | ~0.70 | ~80% | 1.14 | Mild only |
| Passive Low-E (hard coat) | 0.55–0.65 | 70–78% | ~1.2 | Cold (heating dominated) |
| Solar-Control Low-E (single silver) | 0.35–0.45 | 65–72% | ~1.7 | Temperate / mixed |
| Solar-Control Low-E (dual silver) | 0.28–0.38 | 60–68% | ~1.9 | Hot (cooling dominated) |
| Solar-Control Low-E (triple silver) | 0.25–0.35 | 55–65% | ~2.1 | Extreme hot / passive |
| Climate Zone | Heating Degree Days | Cooling Degree Days | Recommended Low-E Type |
|---|---|---|---|
| Cold (Nordic, Canada, Northern US) | >4000 | <500 | Passive Low-E (maximise heat retention) |
| Temperate (UK, Central Europe, NE US) | 2000–4000 | 500–1500 | Solar-Control Low-E (balanced) |
| Hot (Southern Europe, SW US, Middle East) | <1000 | >2000 | Solar-Control Low-E (maximise heat rejection) |
| Mixed (coastal, variable) | 1000–3000 | 1000–2000 | Dual-Silver Low-E (best selectivity) |
| IGU Build-Up | Low-E Type | U-value | SHGC | Best For |
|---|---|---|---|---|
| 6T + 16Ar + 6T (Passive Low-E S3) | Passive hard coat | 1.2 W/m²K | 0.60 | Cold climate retail |
| 8T + 16Ar + 6T (Solar Low-E S2) | Solar-control soft coat | 1.0 W/m²K | 0.35 | Standard energy-code compliant |
| 8T + 20Ar + 6T (Dual-Silver Low-E S2) | Dual-silver soft coat | 0.8 W/m²K | 0.30 | Premium energy performance |
| 8LI + 16Ar + 6T (Solar Low-E S2) | Solar-control + low-iron | 1.0 W/m²K | 0.35 | Premium clarity + energy |
| 8T + 16Ar + 6.38Lami (Solar Low-E S2) | Solar-control + security | 1.1 W/m²K | 0.35 | Energy + security |
| 6T + 12Ar + 6T + 12Ar + 6T (Dual Low-E) | Dual passive/solar | 0.7 W/m²K | 0.35 | Triple-glazed maximum |
| Substrate | Compatibility | Typical Use | Link to Product |
|---|---|---|---|
| Clear Tempered | ✅ Yes (hard coat pre-temper / soft coat post-temper) | Standard Low-E storefront | View Tempered Glass → |
| Low-Iron Tempered | ✅ Yes | Premium display clarity | View Ultra Clear Glass → |
| Tinted Tempered | ✅ Yes (limited coating options) | Solar control + aesthetics | View Tempered Glass → |
| Laminated | ✅ Yes (inner pane, uncoated) | Security + energy | View Laminated Glass → |
| Activity | Passive Low-E (Hard Coat) | Solar-Control Low-E (Soft Coat) |
|---|---|---|
| Cutting | ✅ Can be cut after coating | ✅ Can be cut (coating on one side) |
| Tempering | ✅ Can be tempered after coating | ❌ Cannot be tempered – coating degrades |
| Edge deletion | Not required | ✅ Required (remove coating at edge for seal) |
| Handling | Normal care | Delicate – coating scratches easily |
| Storage | Standard | Coating must face inward in stack |
| Cleaning | Standard glass cleaner | Special care – avoid abrasive cleaners |
Step 1: Substrate Preparation
→ Cut, edgework, drilling (uncoated glass)
↓
Step 2: Tempering (if required)
→ For hard coat: coat first, then temper
→ For soft coat: temper first, then coat (by coater)
↓
Step 3: Low-E Coating Application
→ Hard coat: applied during float process
→ Soft coat: magnetron sputtering at coater facility
↓
Step 4: Edge Deletion (soft coat only)
→ Remove coating 8–10mm from edge for seal adhesion
↓
Step 5: Washing
→ Gentle wash to avoid scratching coating
↓
Step 6: IGU Assembly
→ Spacer, desiccant, primary seal
↓
Step 7: Gas Filling
→ Argon/krypton injection
↓
Step 8: Secondary Seal
→ Protective sealant around perimeter
↓
Step 9: Inspection
→ Coating quality / Gas fill verification / Dew point test| Parameter | Standard Capability | Jumbo Glass Capability |
|---|---|---|
| Max Panel Length | 3000 mm (118″) | ≤6000 mm |
| Max Panel Width | 1500 mm (59″) | ≤3300 mm |
| Max Panel Area | ~4.5 m² | ~20 m² |
| Coating Width Limit | 2540 mm (standard coater) | 3210 mm (wide coater) |
| Shape | Capability | Typical Application |
|---|---|---|
| Rectangle | ✅ Standard | Standard storefront panels |
| Square | ✅ Standard | Individual display windows |
| Trapezoid | ✅ Available | Angled storefront sections |
| Custom polygon | ✅ Available | Irregular storefront layouts |
| Standard | Market | Scope |
|---|---|---|
| EN 1096 | Europe / UK | Primary standard for coated glass |
| EN 673 | Europe / UK | Thermal performance calculation |
| EN 1279 | Europe / UK | Insulating glass units |
| ASTM C1376 | USA | Standard specification for coated glass |
| ASTM E2190 | USA | Insulating glass units |
| NFRC 100 | USA | U-factor determination |
| NFRC 200 | USA | SHGC determination |
| NFRC 300 | USA | Visible transmittance determination |
| AS/NZS 4666 | Australia / NZ | Insulating glass units |
Our Low-E storefront glass is manufactured to meet applicable coating quality, thermal performance and building code requirements for your target market, including EN 1096 and EN 673 for Europe, ASTM C1376 and NFRC ratings for North America, and AS/NZS 4666 for Australia and New Zealand. Coating durability, emissivity and selectivity values are verified by third-party testing. Compliance verification should be confirmed with local building authorities for each project.
| Application | Description | Recommended Low-E Configuration |
|---|---|---|
| Cold-climate retail storefront | Heating-dominated building | Passive Low-E (hard coat) + argon |
| Sun-exposed retail façade | West/south-facing storefront | Solar-Control Low-E (soft coat) + argon |
| Flagship brand store | Premium retail statement | Dual-Silver Low-E + low-iron substrate |
| Shopping centre atrium frontage | Large-format glazing | Solar-Control Low-E + laminated inner |
| Luxury retail (jewellery, fashion) | UV-sensitive merchandise | Solar-Control Low-E (99% UV rejection) |
| Passive house retail | Maximum energy efficiency | Triple-glazed + dual Low-E + krypton |
| Environment | Recommended Low-E Type | Notes |
|---|---|---|
| Cold climate (heating dominated) | Passive Low-E (hard coat) | Maximise heat retention, minimise condensation |
| Temperate climate (mixed) | Solar-Control Low-E (single/dual silver) | Balance heating/cooling performance |
| Hot climate (cooling dominated) | Solar-Control Low-E (dual/triple silver) | Maximise solar heat rejection |
| West/south-facing façade | Solar-Control Low-E | Manage afternoon solar gain |
| North-facing façade (shaded) | Passive Low-E or uncoated | Lower solar exposure |
| Low-E Type | U-value (Double Ar) | SHGC | VLT | UV Rejection | Cost Premium | Best Climate |
|---|---|---|---|---|---|---|
| None (uncoated) | 2.7 | 0.70 | 80% | ~40% | Baseline | Mild only |
| Passive (hard coat) | 1.2 | 0.60 | 75% | ~70% | +15% | Cold |
| Solar-Control (single silver) | 1.0 | 0.40 | 68% | ~99% | +20% | Temperate |
| Solar-Control (dual silver) | 0.8 | 0.30 | 62% | ~99% | +25% | Hot / mixed |
| Solar-Control (triple silver) | 0.7 | 0.28 | 58% | ~99% | +30% | Extreme hot |
Your Storefront Project Location?
↓
Determine Climate Zone:
Cold / Temperate / Hot / Mixed
↓
What is the Façade Orientation?
↓
North / South / East / West / Multiple
↓
What is the Local Energy Code Target U-value?
↓
Check code requirement (e.g., ≤1.2 W/m²K for EU Part L)
↓
Select Low-E Type:
↓
Cold Climate → Passive Low-E (Hard Coat)
Hot/Mixed Climate → Solar-Control Low-E (Soft Coat)
Premium Performance → Dual/Triple Silver Low-E
↓
Select Substrate:
↓
Clear / Low-Iron / Tinted
↓
Select IGU Configuration:
↓
Double / Triple
↓
Select Gas Fill:
↓
Argon / Krypton
↓
Select Inner Pane:
↓
Tempered / Laminated (if security required)
↓
VERIFY COMPLIANCE WITH LOCAL ENERGY CODE
↓
SUBMIT STOREFRONT SPECIFICATIONS FOR QUOTATIONQ1: What is Low-E storefront glass?
Low-E (low-emissivity) storefront glass has a microscopic metallic oxide coating that reflects infrared heat while transmitting visible light. It improves thermal performance by reducing heat loss in winter and heat gain in summer.
Q2: What is the difference between hard coat and soft coat Low-E?
Hard coat (pyrolytic) is applied during glass manufacturing and can be tempered afterwards. Soft coat (sputtered) is applied after cutting and must be protected within an IGU cavity. Soft coat generally achieves better U-values and solar control.
Q3: Which Low-E coating is best for my storefront?
Cold climate → Passive Low-E (hard coat). Hot climate → Solar-Control Low-E (soft coat). Mixed climate → Dual-Silver Low-E for best balance. The choice depends on your climate zone and façade orientation.
Q4: Can Low-E coating be applied to tempered glass?
Hard coat Low-E can be applied before tempering. Soft coat Low-E must be applied to already-tempered glass (or the glass is tempered before coating at a specialist coater).
Q5: Does Low-E coating affect the appearance of my storefront?
Passive Low-E has minimal visual impact. Solar-Control Low-E may have a very slight tint (neutral, blue or grey depending on the coating). Dual-silver coatings offer the most neutral appearance.
Q6: Does Low-E coating protect merchandise from UV fading?
Yes – significantly. Solar-Control Low-E coatings reject up to 99% of UV radiation, protecting displayed merchandise, fabrics and artwork from fading.
Q7: Can Low-E coating be combined with low-iron glass?
Yes. Low-iron glass with Solar-Control Low-E coating provides premium optical clarity combined with energy performance – ideal for luxury retail displays.
Q8: Can Low-E coating be applied to laminated glass?
Low-E coating is typically applied to the inner surface of the outer pane in an IGU. The inner pane can be laminated for security, but the coating itself is not applied to laminated glass.
Q9: How long does it take to produce Low-E storefront glass?
Standard Low-E IGU: 4–6 weeks. Custom Low-E (special coating, low-iron, laminated inner): 6–8 weeks.
Q10: How do I request a quotation for Low-E storefront glass?
Please provide: project location, climate zone, façade orientation, target U-value, substrate preference (clear/low-iron/tinted), IGU configuration, gas fill preference, and applicable standard.
Submit your storefront project specifications for a competitive FOB quotation.
Required Information:
With over 20 years of experience and expertise in glass manufacturing and processing, we are seasoned glass specialists, ready to answer your questions and provide guidance on product selection, installation, and maintenance.
