CRL Tremco POLYshim II 1/8" x 3/8" Black Butyl Sealant Tape

• Continuous integral EPDM shim
• 100% solids pre-shimmed butyl tape
• Designed for compression glazing systems (curtain wall, unitized, punched, ribbon, sloped glazing)
• Meets AAMA 800-92: 804.3, 806.3, and 807.3
• Black color

CRL Tremco® POLYshim™ II Tape (SKU: 7241XC3) is a 100% solids, highly adhesive, elastic, cross‑linked preformed butyl tape designed as a continuous rubber shim for compression glazing. Ideal for curtain wall and unitized curtain wall glazing, punched and ribbon window systems, and sloped glazing, POLYshim™ II prevents sealant squeeze‑out and eliminates pressure points that can cause glass breakage—removing the need to pre‑shim each lite. This pre‑shimmed butyl tape offers strong adhesion, heat resistance, sealant compatibility, and long‑term weathering resistance for high‑performance glazing applications.

Typical Physical Properties:
Base Polymer: cross‑linked butyl rubber (polyisobutylene). Solids Content: 100% by weight. Hardness: 57 durometer Shore "00". Temperature Range: Application 20°F (−7°C) to 120°F (49°C); Service −65°F (−54°C) to 200°F (93°C). Weathering: Unaffected by ultraviolet through glass; remains flexible at low temperatures.

Applicable Standards:
Meets AAMA 800‑92 specifications 804.3, 806.3, and 807.3.

Limitations and Product Warning:
Not for use in joints subjected to continuous water immersion or temperatures exceeding 200°F (93°C). Do not compression glaze glass with POLYshim™ II Tape having less than a 1/8" (3 mm) shim.


For reliable compression glazing performance and simplified installation with a continuous pre‑shim, order POLYshim™ II Tape (SKU: 7241XC3) today.