As building energy efficiency standards continue to rise, Vacuum Insulated Glass (VIG) has become the material of choice for high-end windows and curtain wall projects due to its superior thermal and acoustic insulation properties. The quality of VIG directly impacts a building's long-term energy performance and occupant comfort. From factory production to on-site installation, how can we assess its quality scientifically and accurately? This guide provides an in-depth analysis of VIG quality control, focusing on welding/sealing processes, vacuum leak rates, and on-site inspection methods.

Q1: How to evaluate the quality of VIG after installation?

A: After installation, VIG quality can be assessed through the following two methods:

1. Visual Inspection:

You can directly identify VIG failure through two visible signs:

Dislodged Support Pillars: The micro-pillars inside the vacuum layer are critical for maintaining the structural integrity of the VIG. If the vacuum layer fails, the atmospheric pressure balance is disrupted, causing the pillars to lose their tension and dislodge. This can be identified by observing shifted or fallen pillars on the glass surface.

Condensation: The core function of the vacuum layer is to block heat transfer. If the vacuum seal fails, air and moisture penetrate the interlayer. When a temperature difference exists across the glass, moisture will condense into water droplets or fog on the inner surface. This is a tell-tale sign of vacuum failure.

2. Professional Instrument Testing:

We are currently developing a portable VIG testing device capable of measuring the U-value on-site, providing a reliable quantitative assessment of the glass quality.

Q2: What is the target leak rate for LandVac Ti-VIG?

A: Leveraging the patented FLAS flexible titanium metal sealing technology, LandVac vacuum insulating glass achieves exceptional vacuum integrity, strictly controlling the leak rate to below 100 ppm (parts per million).

Q3: How is the welding quality of VIG inspected?

A: The quality of the VIG seal (welding) can be inspected through two approaches:

Manufacturing Side: Utilising specialised industrial equipment to conduct rigorous testing of the sealing quality during the production process.

Inspection Side: Indirectly verifying sealing quality by measuring the U-value of the finished vacuum glass unit.