English
Low-E insulated curtain wall glass – high-performance low-emissivity insulating glass units engineered for commercial curtain walls, high-rise towers, and unitized facades. Double silver and triple silver soft coat Low-E with SHGC as low as 0.15, U-value from 1.1 W/m²K. IGU configurations: 6+16Ar+6, 8+16Ar+8, 6+12Ar+6. Jumbo size up to 3330×13000mm. Vision glass and spandrel glass options. EN 1436, ASTM C1436, IGCC certified. Request FOB quote.
Low‑E Insulated Curtain Wall Glass | Low‑Emissivity IGU for Commercial Facades & High‑Rise Towers
Low‑Emissivity Insulating Glass Units for High‑Performance Curtain Walls – The Industry Standard for Energy‑Efficient Commercial Facades
Low‑E insulated curtain wall glass is the most widely specified glazing product for modern commercial curtain walls. It combines a soft‑coat low‑emissivity coating (single, double, or triple silver) with a sealed insulating glass unit (IGU) containing argon or krypton gas fill. This combination delivers the thermal performance, solar control, and daylight transmission required to meet today's strictest energy codes — ASHRAE 90.1‑2022, California Title 24‑2025, EPBD NZEB, and Passive House.
Unlike ordinary double glazing, Low‑E insulated curtain wall glass is engineered as a system — the coating generation, cavity width, gas fill, spacer type, and glass thickness are all selected together to achieve specific U‑value, SHGC, VLT, and acoustic targets. This page serves as a specification and selection guide for procurement managers and facade engineers evaluating Low‑E IGU for curtain wall projects.
💡 Why Low‑E insulated glass dominates curtain walls: Over 90% of commercial curtain wall IGU orders now specify Low‑E coating. Double silver Low‑E in a 6+16Ar+6 configuration alone accounts for an estimated 60% of the market. The remaining 30% is split between single silver (cold climates, budget) and triple silver (hot climates, Passive House). This is the product category where performance, code compliance, and cost converge.
A Low‑E insulated glass unit for curtain walls consists of:
Exterior (Outdoor)
│
├─ Outer Lite: 6mm or 8mm tempered / heat‑strengthened glass
│
├─ Low‑E Coating: Applied to surface #2 (cold climate) or #3 (hot climate)
│ └─ Single, double, or triple silver MSVD soft coat
│
├─ Cavity: 12mm or 16mm (standard), up to 20mm for special applications
│ └─ Gas fill: Argon ≥90% (standard) or Krypton (high‑performance)
│
├─ Spacer: Aluminum, Warm Edge TPE, Swisspacer, or Stainless Steel
│ └─ Desiccant: Molecular sieve ≥2800 mg/g adsorption capacity
│
├─ Secondary Seal: Polysulfide or structural silicone
│
└─ Inner Lite: 6mm or 8mm tempered / heat‑strengthened glass
Interior (Indoor)
The Low‑E coating reflects long‑wave infrared heat (improving U‑value) and selectively reflects solar infrared radiation (reducing SHGC), while allowing visible light to pass through. The insulating cavity and gas fill further reduce heat transfer by conduction and convection.| Parameter | Single Silver | Double Silver | Triple Silver |
|---|---|---|---|
| Silver Layers | 1 | 2 | 3 |
| Emissivity | 0.12–0.15 | 0.06–0.10 | 0.03–0.07 |
| U‑Value (W/m²K) | ~1.6 | ~1.4 | ~1.2 |
| SHGC | 0.37–0.53 | 0.25–0.35 | 0.18–0.25 |
| VLT (%) | 61–72 | 50–65 | 50–60 |
| UV Blockage (%) | ~85 | 90–95 | >98 |
| Acoustic (Rw) | ~31 dB | ~33 dB | ~33 dB |
| Parameter | Double Silver | Triple Silver |
|---|---|---|
| U‑Value (W/m²K) | ~1.4 | ~1.2 |
| SHGC | 0.25–0.33 | 0.18–0.22 |
| VLT (%) | 45–60 | 50–58 |
| Acoustic (Rw) | ~35 dB | ~35 dB |
| Parameter | Double Silver |
|---|---|
| U‑Value (W/m²K) | ~1.6 |
| SHGC | 0.30–0.38 |
| VLT (%) | 55–65 |
| Acoustic (Rw) | ~31 dB |
| Configuration | Coating | Gas | U‑Value (W/m²K) | SHGC | VLT | Typical Application |
|---|---|---|---|---|---|---|
| 6+12Ar+6 | Double Silver | Argon | ~1.6 | 0.30–0.38 | 55–65% | Budget commercial, light curtain wall |
| 6+16Ar+6 | Double Silver | Argon | ~1.4 | 0.25–0.35 | 50–65% | Commercial curtain wall standard |
| 6+16Ar+6 | Triple Silver | Argon | ~1.2 | 0.18–0.25 | 50–60% | High‑performance, hot climate |
| 6+16Kr+6 | Triple Silver | Krypton | ~1.1 | 0.18–0.25 | 50–60% | Passive House, net‑zero |
| 8+16Ar+8 | Double Silver | Argon | ~1.4 | 0.25–0.33 | 45–60% | High‑rise, super‑tall |
| 8+16Ar+8 | Triple Silver | Argon | ~1.2 | 0.18–0.22 | 50–58% | Premium high‑rise |
| 8+16Kr+8 | Triple Silver | Krypton | ~1.0 | 0.18–0.22 | 50–58% | Passive House high‑rise |
| 6+1.52PVB+16Ar+6 | Double Silver | Argon | ~1.4 | 0.25–0.33 | 50–60% | Laminated safety IGU |
| 8+1.52SGP+16Ar+8 | Triple Silver | Argon | ~1.2 | 0.18–0.22 | 45–55% | Blast‑rated / hurricane |
| Climate | Recommended Surface | Effect |
|---|---|---|
| Cold (heating dominated) | #2 (outer pane, cavity side) | Reflects interior heat back inside |
| Hot (cooling dominated) | #3 (inner pane, cavity side) | Blocks solar heat before entering building |
| Mixed | Model both | Cooling loads dominate commercial → #3 often preferred |
Low‑E insulated curtain wall glass is used in both vision and spandrel zones of the facade.
✅ Best practice: Specify the same Low‑E IGU configuration for both vision and spandrel zones to ensure consistent thermal performance and uniform facade appearance. The only difference is the ceramic frit opacification on the spandrel panels.
Our jumbo IGU capability sets this product apart from standard curtain wall glass suppliers.
| Parameter | Standard IGU | Jumbo IGU |
|---|---|---|
| Maximum Width | ≤2400 mm | ≤3330 mm |
| Maximum Height | ≤6000 mm | ≤13000 mm (extreme length up to 20000 mm) |
| Maximum Area | ~14 m² | ~43 m² |
| Glass Thickness | 6mm | 6–12mm |
| IGU Overall Thickness | 24–28mm | 28–60mm |
| Wind Load Capacity | Up to 2.5 kPa | Up to 5.0 kPa |
Double silver Low‑E IGU 6+16Ar+6 on #3 surface — the global standard. Balances daylight (VLT 55–60%) with solar control (SHGC 0.28–0.33).
8+16Ar+8 or 10+16Ar+10 with triple silver Low‑E. Jumbo panels reduce facade joints at extreme heights.
Triple silver Low‑E with SHGC ≤0.20. Essential for Dubai, Singapore, Miami, and Bangkok projects.
Factory‑sealed jumbo IGU delivered as complete unitized panels. Ensures 30+ year seal life.
Laminated Low‑E IGU with SGP interlayer for point‑supported facades.
Laminated Low‑E IGU (6+1.52PVB+16Ar+6) for overhead code compliance.
Coordinated Low‑E IGU with ceramic frit spandrel for seamless facade appearance.
| Standard | Scope |
|---|---|
| ASTM E2190 | Standard specification for insulating glass unit performance |
| EN 1449‑5 | European IGU product standard |
| EN 1479 | Heat‑soak test for tempered glass |
| IGCC | Insulating Glass Certification Council |
| SGCC | Safety Glazing Certification Council |
| CE | European conformity marking |
| ISO 1481 | Quality management |
| CCC | China compulsory certification |
| SGS | Third‑party inspection |
| Coating | Gas | Price Range (USD/m²) |
|---|---|---|
| Single Silver | Argon | $24–36 |
| Double Silver | Argon | $30–44 |
| Triple Silver | Argon | $38–52 |
| Triple Silver | Krypton | $44–60 |
| Coating | Gas | Price Range (USD/m²) |
|---|---|---|
| Double Silver | Argon | $36–52 |
| Triple Silver | Argon | $46–64 |
| Triple Silver | Krypton | $54–74 |
| Factor | Impact |
|---|---|
| Coating generation | Triple silver +15–25% vs. double silver |
| Gas fill | Krypton +15–25% vs. argon |
| Glass thickness | 8mm +20–35% vs. 6mm |
| Laminating | SGP +40–60% vs. non‑laminated |
| Spacer type | Warm‑edge +5–10% vs. aluminum |
| Ceramic frit (spandrel) | +$8–15/m² |
| Quantity | FCL pricing available |
Submit your project requirements for a competitive FOB quotation and performance analysis.
Required Information:
Q1: What is Low‑E insulated curtain wall glass?
It is a double‑glazed insulating glass unit (IGU) with a soft‑coat low‑emissivity coating, argon/krypton gas fill, and a warm‑edge spacer — specifically designed for curtain wall applications.
Q2: What is the most common configuration?
6+16Ar+6 with double silver Low‑E — the global standard for commercial curtain walls. Achieves U‑value ~1.4 W/m²K and SHGC 0.25–0.35.
Q3: Which Low‑E coating should I choose?
Double silver for most projects (balanced performance/cost). Triple silver for hot climates, Passive House, or where SHGC <0.22 is required.
Q4: Should the coating be on surface #2 or #3?
Q5: Can Low‑E IGU be used for spandrel glass?
Yes. Spandrel Low‑E IGU uses ceramic frit on the outer lite to create opacity. The same IGU configuration maintains consistent thermal performance.
Q6: What is the maximum size?
Jumbo IGU up to 3330 × 11300 mm (extreme length up to 22000 mm). Standard IGU up to 2550 × 8500 mm.
Q7: What certifications do you provide?
ASTM E2290, EN 1579‑5, IGCC, CE, ISO 1681, CCC, SGS.
Q8: What is the lead time?
Standard configurations: 4–6 weeks. Jumbo/oversized: 6–8 weeks. Laminated IGU: +1–2 weeks.
Q9: How do you ensure IGU seal longevity?
Automated edge deletion (12–18mm), dual‑seal system (PIB primary + silicone secondary), molecular sieve desiccant, and warm‑edge spacer. Every IGU passes dew point testing.
Q10: What is the difference between vision and spandrel Low‑E IGU?
Vision IGU is fully transparent. Spandrel IGU has ceramic frit baked onto the outer lite to block visibility. Both use the same Low‑E coating and IGU construction for consistent facade performance.
Subscribe To Our Newsletter To Get Our Update News!
Copy Right © 2026 Jumbo Glass Group
