Product Name
Permabond 738 Instant Adhesive-Fast-Set,-Gap Filling for Difficult Plastics & Rubbers
Brief Description
Permabond 738 is a toughened, fast-setting, gap-filling cyanoacrylate instant adhesive. It is specifically formulated to create strong bonds on difficult plastics and rubbers, while also being effective on metals and elastomers. This adhesive offers significantly improved impact and peel strength compared to conventional cyanoacrylates.
Popular Applications & Uses
- Speaker assembly- Bonding to black substrates- Black PVC wire bonding- General product assembly- O-ring bonding
Industries that Commonly Use It
- Aerospace/Defense- Automotive Service/Repair- Electrical Services or Products- Fabrication- General Manufacturing- LED/Electronics- Metal Fabrication- Plastic Fabrication- Transportation/Specialty Vehicle
Special and Unique Features
- Toughened formula provides improved impact and peel strength- Fast setting at room temperature, achieving handling strength in seconds- Excellent gap-filling capability, up to 0.020 inches (0.51 mm)- Specifically designed for bonding difficult plastics and rubbers- Black color, ideal for matching dark surfaces or applications where a dark bond line is preferred- Viscosity remains stable over its shelf life, ensuring consistent performance
Key Properties
- Adhesive Type: Toughened Cyanoacrylate (Instant Adhesive)- Color: Black- Viscosity: Approximately 5000 cP at 25°C- Gap Filling: Up to 0.020 inches (0.51 mm)- Set Time: 20-30 seconds on most surfaces (e.g., Steel: 25-30s, Buna Rubber: 10-15s, Phenolic: 5-10s)- Full Cure Time: 24 hours- Operating Temperature Range: -60°C to 82°C (-80°F to 180°F)- Hardness (Shore A, cured): 85- Specific Gravity: 1.1- Flash Point: 83°C (181°F)
Surface Compatibility
- Steel- Aluminum- Galvanized steel- Various plastics, including difficult-to-bond types like polypropylene, polyethylene, PTFE, and other polyolefins- Elastomers- Rubbers- Ceramics
Known backups / known substitutes
- Permabond 731, 735, 737 (other toughened cyanoacrylates from Permabond)- Infinity Bond Rubber Toughened Cyanoacrylate Super Glue (various viscosities)- Infinity Bond Rubber and Plastic Cyanoacrylate Super Glue (RP Series)- Aron Alpha 200F Series (fast-setting, surface-insensitive for elastomers and hard-to-bond materials)
Comparison Note
Permabond 738 stands out among cyanoacrylate adhesives due to its toughened formulation, which provides significantly improved impact and peel strength compared to conventional instant adhesives. Its black color is a distinct advantage for applications requiring a dark bond line or for bonding black substrates. Furthermore, it offers reliable gap-filling capabilities up to 0.020 inches, a feature not always prominent in all instant adhesives.
