Butyl Mastic Sealant Tape

Butyl mastic sealant tape is a self-adhesive, non-hardening butyl rubber tape placed under aluminum cladding overlaps to create a permanent airtight and watertight seal. It fills gaps in uneven laps on outdoor jacketing and acts as a gasket between cladding sheets.

Butyl mastic sealant tape is rated for continuous use from -30°C to +90°C. Because it sits between cladding sheets, on the outer face of the insulation, this range suits most outdoor jacketing. Keep it away from direct contact with hot pipe surfaces.

No, butyl mastic sealant tape is non-hardening and stays flexible and tacky for life. It needs no curing, so the seal is effective as soon as the cladding lap is closed, and it continues to follow thermal movement of the cladding.

Butyl mastic sealant tape is available in 12 mm, 19 mm, 25 mm and 50 mm widths, in 1.5 mm, 2 mm and 3 mm thicknesses, and in 10 m or 15 m rolls. Thicker tape fills larger gaps in uneven overlaps; wider tape suits broader laps on vessels and ducts.

Butyl mastic sealant tape is pressed onto a clean, dry cladding edge, then the overlapping sheet is closed over it and fixed with Self-Tapping Screw or Insulation Band & Buckles. The compression spreads the mastic into the gap, sealing the lap against water and air.

Butyl Mastic Sealant Tape is used inside cladding overlaps, where it stays soft and needs no curing, while Silicone Sealant is gunned onto exposed joints, penetrations and flashings and cures to a flexible rubber. On outdoor cladding the two are often used together.

Yes, butyl mastic sealant tape is fully waterproof and forms a permanent seal. Keeping water out of cladding laps is important because wet insulation loses thermal performance and can contribute to corrosion under insulation, especially on outdoor lines and vessels.

Butyl mastic sealant tape is declared under HS code 39199090, for other self-adhesive plates and tape of plastics, butyl-based in this case. For technical reference, the tape is referenced to ASTM D1970 as a butyl adhesive standard.

Yes, butyl mastic sealant tape is packed as boxed rolls and can go in the same container as Aluminum Cladding Sheet & Coil, screws, bands and insulation. Shipments leave from Nhava Sheva (JNPT) or Mumbai, FCL or LCL. In your enquiry, give the width, thickness, roll length and number of rolls.