Decoding 4SG: The Future-Proof Glass Revolution in Aluminum Window and Door Systems

Why Your Aluminum Casement Window Deserves 4SG Glass

Modern architecture thrives on floor-to-ceiling glazing—with aluminum casement windows now featuring 70%+ glass surfaces. This seismic shift demands smarter aluminum window and door systems that marry aesthetics with extreme thermal performance. Enter 4SG.

Part 1: The TPS Revolution

Pre-4SG Era:

Warm Edge Breakthrough: TPS (Thermoplastic Spacer) tech combined butyl sealants + molecular sieves to create uniform heat dispersion.

Dual-Seal Dominance: Double-sealed insulated glass became the gold standard, slashing energy bills by 30% vs. single-pane designs.

Evolving Timeline:

The development of hollow glass has roughly gone through three stages: blown hollow glass, welded hollow glass, and adhesive-bonded glass unit systems. The adhesive-bonded systems can be further divided into three developmental phases: single-seal systems, double-seal systems, and the double-seal TPS (Thermoplastic Spacer) system.

Part 2: 4SG Unmasked (Four Structural Glazing)

3rd-Gen Game Changer——4SG

It represents the third-generation long-lasting sealing spacer material following materials such as grooved aluminum cold edge spacers, rigid warm edge spacers, and composite warm edge spacers.

Outperforms aluminum spacers/composite strips with dynamic stress absorption.

Argon Guardian: 0.02% annual gas leakage rate (10x lower than TPS) via silicone-structural hybrid sealing.

Climate Warrior: Compensates for glass deformation from -30°C to 80°C, keeping aluminum window and door systems airtight.

Part 3: Why 4SG Reigns Supreme

Elastic Genius: 98% rebound rate vs. TPS’s 80%.   Unbreakable Bond: 3.5MPa adhesive strength (2x TPS) for aluminum casement windows.

Silent Performer: 45dB noise reduction in urban high-rises.

Industry Report: 4SG + structural silicone achieves: Lowest argon leakage (≤0.05%/yr) + Highest moisture blockage (<0.25g/m²/day)