18/05/2024 By admin Off

What is Glass Spacer Fabrication?

Glass spacer fabrication refers to the process of creating glass spacers, which are essential components used in the construction of insulating glass units (IGUs). These spacers are placed between two or more panes of glass to maintain a uniform distance and create an air or gas-filled cavity, which improves thermal and sound insulation properties. Here’s an overview of the process and its importance:

Components and Materials

  1. Spacer Bars: Typically made from materials like aluminum, stainless steel, or composite materials. These bars are hollow and often contain desiccants to absorb moisture.
  2. Sealants: Used to bond the spacer to the glass and to seal the edges of the IGU, preventing gas leakage and moisture ingress.
  3. Desiccants: Placed inside the spacer bars to absorb moisture and prevent condensation within the IGU.

Fabrication Process

  1. Cutting and Bending: Spacer bars are cut to size and bent to form the perimeter shape of the IGU. This can be a simple rectangular shape or custom shapes depending on the design of the window.
  2. Desiccant Filling: The hollow spacer bars are filled with desiccant material. This step is crucial for preventing moisture buildup inside the IGU.
  3. Application of Primary Seal: A primary sealant is applied to the surface of the spacer that will be in contact with the glass. This ensures an initial bond and provides structural integrity.
  4. Assembly: The spacer bar is positioned between two glass panes, and the assembly is pressed together to form a tight bond.
  5. Secondary Sealing: A secondary sealant, often a more robust material like silicone or polysulfide, is applied around the perimeter of the spacer and glass assembly. This secondary seal provides additional strength and durability, ensuring the longevity of the IGU.
  6. Gas Filling: In some cases, the cavity between the glass panes is filled with an inert gas like argon or krypton, which enhances the thermal insulation properties.

Importance of Glass Spacers

  • Thermal Insulation: Spacers help in reducing heat transfer between the inside and outside environments, improving energy efficiency.
  • Sound Insulation: The air or gas-filled cavity created by spacers also contributes to soundproofing, reducing noise from outside.
  • Condensation Prevention: The desiccants in the spacers absorb moisture, preventing condensation inside the IGU.
  • Structural Integrity: Spacers maintain the correct distance between glass panes, ensuring the structural integrity of the IGU.

Types of Spacers

  • Warm Edge Spacers: Made from materials with low thermal conductivity, these spacers reduce thermal bridging and improve the energy efficiency of windows.
  • Flexible Spacers: These are typically made from foam or rubber and provide better performance in terms of thermal insulation and flexibility.


Glass spacer fabrication is critical in the production of windows and doors for residential and commercial buildings. It plays a significant role in modern architecture’s focus on energy efficiency and sustainability.

Overall, glass spacer fabrication is a specialized process that combines precision engineering and materials science to enhance the performance and longevity of insulating glass units.