• Working with ACRYLITE®
  • Test Data Results
  • Fire Test Performance
  • Equipment Materials and Suppliers
  • Product Properties
  • Care & Maintenance
  • Application Advice
  • Cementing
  • Glazing
  • General Reference Documents
  • Acrylic vs Glass


Sealant Recommendations

Sheet Size Recommended Sealant
Up to 36" x 36" Gun grade acrylic latex caulk allowing ± 15% movement.
Dry gaskets (EPDM, Santoprene, or Closed-cell Neoprene)
Up to 96" x 96" High performance Silicone, Polysulfide, or Polyurethane allowing ±25% movement.
Dry gaskets (EPDM, Santoprene, or Closed-cell Neoprene)
Up to 96" x 144" High-performance Silicone, Polysulfide, or Polyurethane allowing ±50% movement
Dry gaskets (EPDM, Santoprene, or Closed-cell Neoprene)

Sealant Systems

These systems have been tested and work if properly installed. Contact manufacturers for limitations and recommendations. There are two types of system installations: elastomeric or butyl tape. Elastomers are gunnable elastic rubber-like substances including high-performance silicone sealants, polyurethane sealants, and high-performance polysulfide sealants. Butyl tapes are synthetic rubber supplied in roll form. Always specify a primerless system when using ACRYLITE® premium sheet.

Elastomeric System Installation

Place ACRYLITE® Premium (FF) sheet directly into the sash or on setting blocks. Attach a removable stop.

Place the continuous non-oily filler tape in the channel to a depth of 1/4" or 3/8" below the sight line (top edge of sash). This depth should be equal to the required sealant depth shown below.

Refer to dimension S in the following drawings:

Thickness Long Dimension Polysulfide, Silicone, or Polyurethane Sealant Dimensions   Filler Tape Dimensions  
    Depth (S) Width (T) Depth (W) Width (T)
3/16" 72-108" 1/4" 3/8" 3/4" 3/8"
1/4" 72-108" 1/4" 3/8" 3/4" 3/8"
1/4" 108-144" 1/4" 1/2" 7/8 1/2"
3/8" 72-108" 1/4" 3/8" 3/4" 3/8"
3/8" 108-144" 1/4" 1/2" 7/8" 1/2"
1/2" 108-144" 1/4" 1/2 7/8" 1/2"
  • Apply sealant with a caulking gun. Follow manufacturer's recommendations.
  • If you use other filler materials such as neoprene foams, butyl foams, or glazing tapes, contact manufacturers regarding compatibility with sealing compound.

Butyl Tape System Installation

This system offers advantages: the tape is premolded and fully cured; its seal performs well; you can install exterior and interior beads from the inside; you needn't prime or clean. Coordinate channel, shim, and tape dimensions - see the chart below under "Procedures". To work, the tape must be slightly compressed when the removable stop is in place.


  • Adhere 1" long spacer shims (SP) every 12" around the fixed stop's perimeter. Use at least two shims per edge. Shim thickness and width are critical. The following table has required dimensions. See the following drawing.
  • Leave release paper in place. Apply butyl tape (TW) to the fixed stop on the sash's perimeter; position the tape 1/16" below the sight line (top edge of sash). Overlap the tape at least 1/8"at corners and splices.
  • Remove release paper.
  • Place the ACRYLITE® premium sheet panel directly in the sill or on setting blocks. Center it in the sash and press firmly against the tape. Maintain correct head and jamb clearance.
  • Position spacer shims on removable stops opposite those on fixed stops.
  • Apply butyl tape to removable stops and cut flush with the stops' ends. Remove release paper, press stops in place, and attach to the fixed stop.

The rabbet width must equal twice the final tape thickness (2xTT) plus the sheet thickness. See the Equipment and Materials Sources listing at the end of this brief for sources.

Long Side Of Panel Tape Width (TW) Compressed Tape Thickness (TT) Use Tape Size Spacer Width (SP)
36" 3/8" 3/16" 1/4" 1/4"
48" 3/8" 3/16" 1/4" 3/8"
60" 3/8" 1/4" 5/16" 3/8"
72" 1/2" 1/4" 5/16" 3/8"
96" 1/2" 5/16" 3/8" 1/2"

Provide a spacer shim 1/32" thinner than SP. Compress butyl tape when removable stop is attached.

Go back

Related articles

ACRYLITE® acrylic products that meet Federal Motor Vehicle Safety Standard for Safety Glazing (FMVSS 205) (utilizing ANSI Z26.1) ACRYLITE® acrylic products that meet or Federal Motor Vehicle Safety Standard 302, Flammability of Interior Materials How do I figure out expansion and contraction of acrylic for a glazing application?