Product Name
Permabond Cyanoacrylate 791 Instant Adhesive-for Difficult Plastics & Rubbers
Brief Description
Permabond 791 is a low-viscosity, ultra-fast setting cyanoacrylate adhesive specifically engineered for surface-insensitive bonding. It excels at rapidly bonding a wide array of materials, including challenging plastics, rubbers, and acidic surfaces such as wood and plated metals. This single-component, solvent-free adhesive cures quickly at room temperature upon contact with surface moisture and is compliant with MIL-SPEC standards.
Popular Applications & Uses
- Post-assembly bonding and micro-crack sealing- High-speed production lines- Precision bonding applications- Rapid repairs for industrial tools and machinery- Automotive, medical device, and electronics assembly- O-ring bonding and general product assembly
Industries that Commonly Use It
- Aerospace/Defense (due to MIL-SPEC compliance and aerospace-grade fastening)- Automotive Service/Repair (for automotive assembly)- General Manufacturing (for high-speed production and various bonding needs)- LED/Electronics (for electronics assembly and processes like wave soldering)- Medical Device/ Prosthetics (for medical device assembly)- Metal Fabrication (for bonding various metals)- Plastic Fabrication (for bonding a wide range of plastics, including difficult ones)
Special and Unique Features
- Ultra-fast setting time, achieving fixture strength in 2-3 seconds- Rapid development of high bond strength- Ease of use, requiring no mixing or heat cure- Surface-insensitive formula, capable of bonding acidic and difficult-to-bond surfaces- Low-viscosity with excellent wicking action, ideal for penetrating tight-fitting parts and post-assembly bonding- 100% solids and solvent-free, making it eco-friendly with no VOCs- MIL-SPEC compliant (MIL-A-46050C Type II, Class 1 and CID A-A-3097 Type II, Class 1)- Minimizes frosting and fogging
Key Properties
- Chemical Composition: Ethyl cyanoacrylate- Appearance: Colourless- Viscosity @ 25°C: Low, 15-50 mPa.s (cP) or 30-50 mPas- Specific Gravity: 1.1- Maximum Gap Fill: 0.1 mm (0.004 in) to 0.5 mm (0.02 in)- Fixture/Handling Time: 2-3 seconds (on steel, Buna-N rubber, phenolic)- Full Cure Time: 24 hours- Shear Strength (ISO 4587): Steel: 18-22 N/mm² (2600-3200 psi); ABS: >6 N/mm² (870 psi)- Temperature Resistance: -55°C to 82°C (-65°F to 180°F) for continuous use; can withstand brief higher temperatures (e.g., paint baking, wave soldering)- Chemical Resistance: Withstands solvent wash; not recommended for strong oxidizing materials and polar solvents- Oil Resistance: Motor oil resistance
Surface Compatibility
- Plastics (including difficult plastics like ABS, phenolic)- Rubbers/Elastomers (including Buna-N rubber)- Wood- Plated Metals- Ceramics- Steel- For polypropylene, polyethylene, PTFE, or silicone, Permabond Polyolefin Primer (POP) is recommended for optimal bonding
Known backups / known substitutes
- Loctite® 401- 3M™ Scotch-Weld™ CA40H- Permatex® Surface-Insensitive Super Glue- Infinity Bond CA 100 RP
Comparison Note
Permabond 791 offers an ultra-fast, high-strength bonding solution, distinguishing itself with its surface-insensitive properties and rapid cure speed, making it highly suitable for high-speed production environments and challenging substrates where other adhesives might struggle.
