Sika — Sealants & Adhesives
Sikaflex-221
Versatile, high-elasticity single-component polyurethane sealant.
- Joints & Cracks
- General Construction
Technical Overview
- Product Type
- Polyurethane Adhesive Sealant
- System
- One-component
- Cure Mechanism
- Moisture-curing
- Application
- Gun-applied (cartridge)
- Suitable Surface
- Metal, Painted Surfaces, Ceramics, Plastics
- Primary Use
- Multi-purpose Bonding & Sealing
- Environment
- Interior / Exterior
About This Product
Sikaflex-221 is a one-component polyurethane adhesive and sealant built for a wide adhesion range — metals, painted surfaces, ceramics and plastics — without needing a primer on most substrates. It's a moisture-curing formulation intended for permanent elastic seals rather than rigid, non-moving joints.
System Role
Multi-purpose adhesive sealant
A general-purpose sealing layer for joints and fixings across mixed substrates, where broad adhesion matters more than a specific chemistry match to one material.
Typical Applications
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