3M 7100200230 Polyurethane Sealant 540 Gray

Product Description

The 3M 7100200230 is a one-component, moisture-curing polyurethane sealant in gray, sold as a single unit. It cures on contact with ambient moisture to form a permanently elastic bond suitable for sealing, joining, and caulking applications across a wide range of substrates. The fully cured bead remains flexible, making it effective in assemblies subject to vibration, thermal cycling, or minor structural movement. Installers in HVAC, construction, marine, and general fabrication trades reach for this product when a durable, weatherable seal is required on mixed-material assemblies.

This sealant is suited for applications involving dissimilar materials where differential expansion is a concern. It bonds directly to plastics, fiberglass-reinforced plastic (FRP), sheet molding compound (SMC), aluminum, steel, coated metals, and wood without requiring a separate primer in most cases. Typical use cases include sealing panel joints, perimeter seals around penetrations, and fabrication bonds in both residential and light commercial construction or equipment assembly environments.

Key Features

• One-component formula — no mixing required, ready to apply directly from the cartridge
• Moisture-cure chemistry allows cure in place without heat or UV exposure
• Permanently elastic bond accommodates vibration and thermal movement after cure
• Adheres to plastics, FRP, SMC, aluminum, steel, coated metal, and wood
• Gray color blends with metal and composite substrates common in mechanical and construction applications

Compatibility

Designed for bonding and sealing applications on plastics, FRP, SMC, aluminum, steel, coated metal, and wood surfaces. Verify substrate preparation requirements per the manufacturer data sheet before application on low-surface-energy plastics or heavily contaminated surfaces.

Installation Notes

Application is performed using a standard caulk or sealant gun sized for the cartridge format. Clean and dry all mating surfaces before applying the sealant bead; contamination from oil, dust, or moisture will reduce adhesion. Allow full cure before placing the assembly into service — cure rate depends on ambient temperature and relative humidity. Consult local building codes and the manufacturer data sheet for guidance on joint design and sealant depth-to-width ratios.

Technical Specifications

• Weight: 11.89 pounds
• Color: Gray
• Cure Type: One-component moisture cure
• UOM: Each
• UPC: 50021200490625

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100200230