What is Insulated Glass Unit (IGU)? A Complete Guide to Energy-Efficient Architectural Glass

I. Structure of Insulated Glass Units

ⅡKey Features

l Excellent Heat Insulation: Effectively reduces heat transfer, saving energy and protecting the environment.

l Good Soundproofing Effect: Capable of reducing noise by 25 to 40dB.

l Anti-Condensation: Sealed structure combined with dry air or inert gas prevents water vapor condensation.

l High Safety & Security: Customizable with tempered, laminated, or low-iron glass combinations to meet diverse safety requirements.

l Great Aesthetic Appeal: Offers a variety of glass combinations to satisfy diverse architectural design and appearance needs.

Ⅲ Common Insulated Glass Configurations

Configuration Example	Glass Combination	Air Layer	Features & Applications
5+12A+5	5mm Clear Glass + 12A + 5mm Clear Glass	12mm	Basic configuration, cost-effective, widely used for doors and windows
6+12A+6 Low-E	6mmLow-E Glass + 12A +6mm Clear Glass	12mm	Energy-saving and thermal insulation, suitable for high-rise buildings
8+16A+8 Low-E	8mmLow-E Glass +16Ar +8mm Clear Glass	16mm(Argon)	High thermal insulation, suitable for passive houses and energy-efficient buildings.
6+12A+6+12A+6	Double Insulated Glass Structure	12mm+12mm	Superior thermal and sound insulation, suitable for certain walls.
6+1.52PV6PVB+6+12A+6	Laminated +Insulatated Glass	12mm	Blast-Resistant Safety Glass — Designed for High-Security Environments.

Ⅳ. Core Material Analysis of Insulated Glass Unit

1. Spacer Bars

· Aluminum Spacer: Cost-effective & durable, widely used for standard doors & windows.

· Warm Edge Spacer: Reduces heat transfer and greatly improves the energy efficiency of the whole window.

2. Molecular Sieve Desiccant absorbs moisture inside the air cavity to keep the space dry, prevent internal condensation fogging, and extend the service life of the IGU.

3. Double-Seal Adhesive System

· Inner Butyl Sealant: Excellent air tightness, blocks moisture and inert gas leakage.

· Outer Silicone Structural Sealant / Polysulfide Sealant: High structural strength, outstanding weather resistance for long-term outdoor application.