Fasto - SA26 - Structural Adhesives

Fasto SA 26 – High Impact Structural Adhesive for Rigid Metal Bonding

Fasto SA 26 is a high-viscosity, anaerobic structural adhesive based on polyurethane-modified acrylate chemistry, designed for bonding rigid components where high impact strength and durability are essential. The adhesive cures in the absence of air when confined between close-fitting metal surfaces, forming a tough, flexible, and solvent-resistant bond.

Fasto SA 26 is widely used in high-strength metal bonding applications, including bonding of magnets in DC motors, where resistance to vibration, heat, and chemicals is critical.

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Key Features

  • Anaerobic Structural Adhesive Technology
    Cures only between metal surfaces for controlled bonding.
  • High Viscosity (~11,000 mPa·s)
    Ideal for vertical surfaces and gap filling without run-off.
  • High Impact & Tensile Strength
    • Tensile strength: 34 N/mm²
    • Lap shear strength (steel): ≥15.2 N/mm²
  • Excellent Solvent & Chemical Resistance
    Resists motor oil, petrol, ATF oil, phosphate ester, and humidity.
  • Wide Temperature Resistance
    Continuous service from -54°C to +130°C.
  • Good Gap Filling Capability
    Fills gaps up to 0.5 mm.
  • Fast Initial Strength Build-Up
    Initial solid time: ~5 minutes.

Benefits

  • Provides strong, durable structural bonds for metal assemblies
  • Ideal for DC motor magnet bonding and high-impact applications
  • Performs reliably under thermal cycling and vibration
  • Reduces reliance on mechanical fastening
  • Ensures long service life in demanding industrial environments
Primary Application Sub-Applications Functional Purpose Key Performance Advantage
High-Strength Metal Bonding Rigid metal-to-metal assemblies Structural bonding under load High tensile & lap shear strength
Magnet Bonding in DC Motors Permanent magnet fixing in motor housings Secure retention under vibration & heat High impact strength with solvent resistance
Rigid Component Assembly Precisely fitted mechanical components Permanent structural bonding Anaerobic cure ensures controlled strength
High-Impact Load Assemblies Components exposed to shock & dynamic stress Prevent joint failure Excellent elongation with toughness
Close-Fit Structural Bonding Assemblies with minimal clearances Reliable bonding without mechanical fasteners High viscosity prevents run-off
Industrial Equipment Assembly Motors, actuators, mechanical sub-assemblies Long-term structural integrity Stable performance across temperature range
Solvent-Exposed Structural Joints Assemblies exposed to oils & industrial fluids Maintain bond durability Good resistance to oils, fuels & solvents

Surface Preparation

  • Ensure bonding surfaces are clean, dry, and free from oil, grease, dust, and contaminants.
  • Proper surface cleanliness is critical for achieving maximum strength and consistent curing.

Application Method

  1. Apply Fasto SA 26 to one or both bonding surfaces.
  2. Assemble parts immediately to exclude air from the bond line.
  3. Maintain alignment until the adhesive reaches initial solid strength.
  4. Wipe off excess adhesive from the outside of the joint.

Curing Guidelines

  • Initial solid time: ~5 minutes @ 25°C
  • Full strength: 24 hours @ 25°C
  • Maximum recommended gap: 0.5 mm

Additional Notes

  • Not recommended for pure oxygen or oxygen-rich systems.
  • Should not be used as a sealant for chlorine or strong oxidizing materials.

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