3M SCOTCH-SEAL 800 (5-oz-Tube)

3M™ Scotch-Seal™ Industrial Sealant 800

Overview

3M™ Scotch-Seal™ Industrial Sealant 800 is a brushable nitrile-based industrial sealant designed to provide flexible, durable sealing against water, oils, and fuels. Air drying to a resilient elastomeric seal, it offers excellent adhesion to a wide variety of metallic surfaces while maintaining flexibility over a broad temperature range. The sealant is suitable for aerospace, industrial, transportation, and general manufacturing applications requiring long-lasting environmental sealing and fluid resistance.

Key Technical Characteristics

• Product Type: Brushable industrial sealant
• Base Chemistry: Nitrile rubber
• Appearance: Reddish brown
• Consistency: Heavy syrup
• Solvents:
  • Methyl Ethyl Ketone (MEK)
  • Methyl Isobutyl Ketone (MIBK)
• Solids Content: 50�59% by weight
• Viscosity: 25,000�45,000 cP
• Operating Temperature Range: -54�C to +93�C (-65�F to +200�F)
• Tack-Free Time: 5�10 minutes
• Complete Dry Time: 1�3 days
• Coverage:
  • 1/8 in. bead: Approximately 1,500 linear ft./gal.
  • 1/4 in. bead: Approximately 375 linear ft./gal.

Core Performance Benefits

• Forms a flexible, durable seal after air drying
• Excellent resistance to water, oils, and fuels
• Strong adhesion to a wide variety of metallic surfaces
• Maintains flexibility across a broad operating temperature range
• Fast tack-free time improves production efficiency
• Good weathering resistance for long-term service
• High elongation accommodates joint movement
• Suitable for brush, caulking gun, and pressure dispensing applications

Typical Applications

• Aircraft sealing applications
• Industrial equipment assembly
• Metal panel sealing
• Automotive and transportation manufacturing
• General-purpose maintenance sealing
• Fuel and oil resistant sealing applications
• Metal fabrication and assembly
• Industrial repair and overhaul operations

Material Engineering & Design Features

Scotch-Seal™ 800 utilizes a nitrile rubber formulation that air cures into a flexible elastomeric seal capable of resisting water, fuels, oils, and environmental exposure. The sealant maintains adhesion and flexibility even after prolonged exposure to elevated temperatures and weathering conditions.

Typical cured performance includes:

• Tensile Strength: 180�215 psi (depending on conditioning)
• Elongation: 750�1370%
• Moisture Vapor Transmission: 3.1 g/m�/24 hr (0.035 in. film)
• Low-temperature flexibility maintained to -55�F (-48�C)

The cured sealant remains flexible after accelerated weathering and prolonged outdoor exposure while continuing to provide effective environmental sealing.

Installation & Handling

• Ensure surfaces are clean, dry, and free from oil, grease, and contaminants
• Clean substrates using approved solvents such as isopropyl alcohol, MEK, or acetone where appropriate
• Apply using:
  • Brush
  • Hand caulking gun
  • Pressure dispensing equipment
  • Flow gun systems
• Surface becomes tack-free within approximately 5�10 minutes
• Allow 1�3 days for complete curing depending on temperature and air circulation
• Clean equipment immediately after use with approved solvents

Environmental & Compliance Notes

• Store in original unopened containers
• Recommended storage temperature: 16�C to 27�C (60�F to 80�F)
• Shelf Life: 15 months from shipment when properly stored
• Lower storage temperatures may temporarily increase viscosity
• Rotate inventory using first-in, first-out (FIFO) practices
• Consult the Safety Data Sheet (SDS) before handling
• Use appropriate ventilation and eliminate ignition sources during application

Key Advantages

• Excellent resistance to water, fuel, and oil exposure
• Flexible seal accommodates movement without cracking
• Strong adhesion to metallic substrates
• Wide service temperature range for demanding environments
• Fast tack-free time improves assembly efficiency
• Compatible with multiple application methods
• Excellent long-term weathering performance
• Suitable for aerospace, industrial, transportation, and manufacturing applications