Products

3M™ Scotch-Weld™ Epoxy Adhesive EC-3531 B/A FR

Brand: 3M™ Scotch-Weld™

Package Sizes:

  • Cartridges:
    • 1.64 fl oz (48.5 mL)
    • 6.76 fl oz (200 mL)
  • Bulk Containers:
    • 10 gallons (37.85 liters)

Shelf Life: 15 months

Product Description

3M™ Scotch-Weld™ Epoxy Adhesive EC-3531 B/A FR is a self-extinguishing, two-part flame retardant epoxy adhesive. This adhesive meets the 14 CFR 25.853(a) Burn Test requirements and has a work life of 4 to 8 minutes after mixing. It is ideal for applications requiring a self-extinguishing structural epoxy adhesive system.


Key Features

  • Flame Retardant: Meets 14 CFR 25.853(a) Burn Test requirements.
  • Fast Cure Time: Work life of 4 to 8 minutes; handling strength achieved in approximately 30 minutes.
  • Convenient Application: Available in various cartridge sizes for minimal waste and easy application.
  • Versatile Bonding: Effective on metals, plastics, rubber, and glass.
  • No Added Halogens: Does not contain intentionally added brominated or antimony-based flame retardants.

Recommended Applications

  • Bonding metals, plastics, rubber, and glass in aerospace interiors.
  • Applications requiring compliance with flame retardancy standards.
  • Structural bonding where a fast cure and strong adhesion are needed.

Typical Uncured Physical Properties

Property Value
Color Base: Off-White; Accelerator: Black
Viscosity Base: 80,000 – 160,000 cP; Accelerator: 80,000 – 160,000 cP
Mix Ratio 1:1 by volume
Work Life 4 to 8 minutes after mixing
Time to Handling Strength Approximately 30 minutes
Full Cure Time 24 to 48 hours at 73°F (23°C)

Typical Cured Physical Properties

Property Value
Color Black
Shore D Hardness 80
Tensile Strength 3,500 psi
Elongation at Break 1%
Glass Transition Temperature (Tg) 60°C (140°F)

Performance Characteristics

Overlap Shear Strength

Substrate Value (psi)
Aluminum 3,500
Stainless Steel 3,500
Polycarbonate 1,000
ABS 1,000

Tested at 73°F (23°C) after 7 days of curing.

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