- ClearPoint™
   - CyberShield™
   - Insulating
   - Insulating Laminated
   - Laminated Insulating
   - Double Laminated Insulating
   - Monolithic
   - Triple Insulating

   - Coatings
   - Glass Substrates
   - Heat Treatment
   - Spacer
   - Silicone
   - Interlayer

   - Argon
   - DigitalDistinctions™
   - Edgework
   - Holes
   - Notches
   - Silk-screen
   - Spandrel

   - Solar
   - Acoustic





Silk-screening ceramic frit onto glass lets a designer create a subtle or bold look for a building-using patterns and color. Silk-screened glass improves solar control performance and can be combined with clear or tinted glass substrates, as well as with high-performance coatings to reduce glare and decrease solar transmission.

The first step in silk-screening involves washing the annealed glass. Then, the ceramic frit paint is applied to one side of the glass. Next, it is fired within a tempering furnace to create a permanent coating. The glass is always either heat strengthened or fully tempered to prevent glass breakage due to thermal stresses under sunlit applications.

When designing with silk-screen patterns, it is important to select the pattern (screen), select the color for the pattern and identify the pattern orientation.

Silk-screen Patterns
Viracon offers a variety of standard Viraspan™ Design patterns as well as the ability to customize a façade using your own Viraspan Design – Original.

Viraspan™ Design

Viraspan Design - Original
Borders, graduations or custom patterns you design.

Viraspan™ Color Options
Viracon uses only lead free ceramic frit paints, which are environmentally friendly, to apply the silk-screen pattern onto the glass surface. A proven performer, Viraspan ceramic frit paints are the product of choice for color consistency, durability, cost control and long life. For silk-screen applications, Viracon offers translucent and opaque (when viewed in reflection with an opaque uniform background) ceramic frit color options.


Silk-screen Orientation
Pattern placement, aka orientation, must also be considered when specifying silk-screened glass and should be included in the drawings if you are using a line pattern or for all other patterns if a specific orientation is required.


Silk-screen Performance
Viracon recommends applying the silk-screen pattern to the second (#2) surface for optimum solar performance. The Low-E or reflective coating can be applied to the same surface as the silk-screen pattern.


Specifying Silk-Screened Glass
When specifying silk-screened glass, include the pattern, color and orientation in the overall glass composition. If it is not practical to describe the orientation in the specification, a drawing should be referenced to clearly identify orientation.

Specification Example

Silk-screen Design Guidelines
Silk-screen patterns may be applied to any surface except the exterior (#1) surface. Viracon recommends applying the silk-screen pattern to the #2 surface for optimal performance. See silk-screen performance for additional information.

1/16” minimum dot, pixel or space

For coverage options, refer to ceramic frit coverage rules below

Dual Surface Patterns

  • Due to moiré pattern potential and manufacturing tolerances, dual surface silk-screen patterns (typically requested as #2 and #3 surface) are not recommended.
  • The following double patterns are specifically problematic and will not be supplied.
    • Both patterns utilize the same ceramic frit color.
    • One pattern is an exact inverse of the other. Ex: 60% coverage 1/8” holes on one surface and 40% coverage 1/8” dots on the other. These patterns will not line up and will create an uneven appearance or a moiré pattern.
  • Viracon's Dual Surface Silk-screen Pattern Disclaimer must be signed before Viracon is able to provide any dual surface pattern samples.
  • A full size mock-up or Viracon's Signed Mock-up Waiver is required before glass is ordered.
  • Any other requests for a dual surface pattern must be reviewed by Viracon’s Technical Services and Manufacturing Departments.


Ceramic Frit Coverage Rules
All maximums listed are for any one square foot area of a glass unit.
Ceramic Frit Chart
**Not available for interior applications and not available with coatings on the same surface. Also, when translucent frit is used as full coverage, inherent characteristics may make this product unsuitable for vision areas. These characteristics include slight variations in color and uniformity, pinholes or streaks.

Ceramic Frit Inherent Characteristics

When considering translucent frits for spandrel applications note that these areas may be prone to condensation formation on interior glass surfaces. Over time, this may result in a visible film formation. Therefore, consideration must be given to the suitability of these products in spandrel applications. For these applications, the translucent frit may only be applied to non-exposed surfaces. See silk-screen inspection guidelines and manufacturing tolerances in the quality section for additional information.

Moiré Pattern
Moiré is an optical phenomenon that may present itself as a “wavy, rippled or circular” pattern under certain conditions. Moiré patterns can be created whenever one semi-transparent object with a repetitive pattern is placed over another. The moiré pattern is not a glass defect, but created when the images do not align. For additional information, please review Viracon’s Moiré Pattern Tech Talk.