Insulating Glass Product Standards

Uncoated Insulating Glass

Minimum Size	Maximum Size
Annealed
8" x 18" (203 mm x 457 mm)	84" x 144" (2134 mm x 3658 mm)
Heat processed
12" x 12" (305 mm x 305 mm)	84" x 144" (2134 x 3658 mm)

Minimum Size	Maximum Size
Annealed
8" x 18" (203 mm x 457 mm)	84" x 144" (2134 mm x 3658 mm)
Heat processed
12" x 12" (305 mm x 305 mm)	84" x 144" (2134 mm x 3658 mm)

Premium over-sized maximum: 84" x 165" (2134 mm x 4191 mm) or 96" x 144" (2438 mm x 3658 mm). Premium over-sized maximum for silk-screened glass and for heat-soaked glass is 84" x 165" (2134 mm x 4191 mm). A technical reiew is required for all over-sized requests.

1. In some cases, insulating glass units may require heat processing. Refer to heat processing comments on page 14 for further product information.

2. Coated Glass Inspection Guidelines. Viracon's coated glass products comply with ASTM Standard C 1376.
Pinholes-Inspect glass from a distance of 10 ft. (3 m) in transmission, at a viewing angle of 90° to the specimen, against a bright uniform background. If a pinhole is readily apparent, the following criteria apply: Pinholes larger than 1/16" (1.6 mm) in diameter are not allowed in 80 percent of the central glass area. Pinholes larger than 3/32" (2.4 mm) are not allowed in the outer 20 percent of the glass area. No more than two readily apparent blemishes are allowed in a 3" (75 mm) diameter
circle and no more than five readily apparent blemishes are allowed in a 12" (300 mm) diameter circle.
• Uniformity-When viewing coated glass from a minimum distance of 10 ft. (3 m), color variation may occur from one unit to another. This can be caused by variations within the float glass substrate and normal production variations, and this is not considered a defect. All Viracon commercial glass products conform to industry color standards.
• Distortion-Various factors involved in heat processing, insulating air spacers and frame binding may distort reflected objects viewed on the glass surface. These are not considered defects of the coated glass or the final fabricated product.
• Scratches-Inspect glass from a distance of 10 ft. (3 m). Scratches up to 2" (50 mm) are allowed in 80 percent central glass area, and scratches up to 3" (75 mm) are allowed in the outer area. Concentrated scratches or abraded areas are not allowed.

Solarscreen Insulating Spandrel Glass

Minimum Size	Maximum Size
12" x 36" (305 mm x 914 mm)	84" x 144" (2134 mm x 3658 mm)

Minimum Size	Maximum Size
12" x 12" (305 mm x 305 mm)	84" x 144" (2134 mm x 3658 mm)

Premium over-sized maximum: 84" x 165" (2134 mm x 4191 mm). A technical review is required for all over-sized requests.

1. Viracon designs its spandrel glass for glazing against a uniform, opaque background. We do not recommend its use in transoms, partitions or other areas where a uniform, opaque background is unavailable.

2. Viraspan Spandrel Glass Inspection Guidelines
• View spandrel glass from a distance of 15 ft. (4.6 m) under natural daylight conditions. Color and reflectance may vary when viewed under a uniform, opaque background. This is not considered a defect.
• When viewing spandrel glass under similar conditions, reflected pinholes and scratches are not considered defects if they are unobtrusive.

3. You can use Viraspan in structurally glazed applications. However, a clear edge may be visible. Contact Viracon's Architectural Inside Sales Department for more information.

4. Viracon reserves the right to change substrate glass suppliers. As a result, this may affect perceived colors of our Viraspan samples. Approval of all glass colors is based on 12" x 12" (305 mm x 305 mm) samples, which are ordered for each project.

Heat-Processed Glass (Heat Strengthened and Tempered)
1. Glass cutting and fabrication is completed prior to heat processing.

2. Viracon's two types of heat-processed glass comply with ASTM Standard C1048. Surface compression of heat-strengthened glass with thicknesses of 1/4" (6 mm) and less is 4,000-7,000 psi. Surface compression for 5/16" (8 mm) and 3/8" (10 mm) heat-strengthened glass is 5,000-8,000 psi.* For fully-tempered glass, the minimum surface compression is 10,000 psi. It also complies with ANSI Z97.1 and CPSC 16 CFR 1201 safety glazing standards.
*Because of reader repeatability and instrument tolerances, Viracon's tolerance for heat-strengthened glass surface compression is +/- 1,000 psi.

RECOMMENDED CLEARANCES

Note: The maximum sizes listed are shown to illustrate production limits. These sizes are unavailable as finished products. Maximum piece size for annealed glass under any condition is 50 sq. ft. (4.65 sq.m.) Maximum size for heat-treated glass under any condition is 65 sq. ft. (6.04 sq.m.) Maximum unit weight is 750 pounds (340 kg). The premium over-weight maximum is 2000 pounds (907 Kg). A technical review is required for all over-weight requests.

For more information on insulating glass or additional literature, call 800-533-2080 or e-mail us