Permabond 268 Instant Adhesive

Description

Permabond® 268 is a medium-to-high viscosity cyanoacrylate adhesive formulated for large gap-filling applications while providing fast set times. It bonds a wide range of substrates, including metals, ceramics, plastics, and elastomers, and is particularly effective on difficult-to-bond plastics such as polyacetals and passivated metal surfaces.

This single-component adhesive cures rapidly at room temperature when pressed into a thin film between parts. It meets MIL-SPEC MIL-A-46050C Type II, Class 3 (existing designs), ensuring compliance for military, aerospace, and industrial applications.

For customers looking for alternatives to Loctite® 380, 3M™ Scotch-Weld™ PR600, or Permatex® Black Super Glue, Permabond 268 provides an industry-leading high-strength bonding solution.

Key Features & Benefits

✅ Medium-High Viscosity for Controlled Application – Ideal for gap-filling applications up to 0.43 mm (0.017 in)
✅ MIL-SPEC Compliant – Meets MIL-A-46050C Type II, Class 3
✅ Fast-Setting Formula – Achieves handling strength in 5-10 seconds
✅ Bonds a Wide Range of Materials – Adheres to metals, plastics, ceramics, and elastomers
✅ Excellent Performance on Difficult Surfaces – Works well on polyacetals and passivated metals
✅ High Strength & Impact Resistance – Provides durable, structural bonds
✅ Single-Part, No Mixing Required – Easy-to-use for fast production
✅ 100% Solids, Solvent-Free – Eco-friendly with no VOCs

Technical Specifications

• Viscosity: 1,200-2,400 mPa.s (medium-high viscosity)
• Gap Fill: 0.43 mm (0.017 in)
• Fixture / Handling Time:
  • Steel: 5-10 sec
  • Buna-N Rubber: 5-10 sec
  • Phenolic: 5-10 sec
• Full Cure Time: 24 hours
• Shear Strength (ISO 4587):
  • Steel: 20-22 N/mm² (2900-3200 psi)
  • ABS: >6 N/mm² (>870 psi)** SF
  • PVC: >6 N/mm² (>870 psi)** SF
  • Polycarbonate: >5 N/mm² (>725 psi)** SF
• Impact Strength (ASTM D-950): 3-5 kJ/m² (1.4-2.4 ft-lb/in²)
• Temperature Range: -55°C to 82°C (-65°F to 180°F)
• Color: Clear

Applications

• Large gap-filling applications in industrial bonding
• Bonds passivated metal surfaces, polyacetals, and difficult-to-bond plastics
• Precision bonding in automated dispensing systems
• Medical device and electronic component assembly
• Military, aerospace, and automotive manufacturing

Directions for Use

1. Ensure surfaces are clean, dry, and grease-free. Use acetone or isopropanol for best results.
2. Apply Permabond 268 sparingly to one surface only.
3. Quickly align and press components together. Apply even pressure to ensure a thin, even adhesive film.
4. Hold in place for 5-10 seconds until initial bond forms.
5. Allow 24 hours for full strength development.
6. For difficult or porous surfaces, use Permabond CSA or QFS 16 Activator.

🔹 Note: For bonding polypropylene, polyethylene, PTFE, or silicone, use Permabond Polyolefin Primer (POP) before applying adhesive.