Product Name
- Permabond 737 Instant Adhesive-Black Magic Toughened & Flexible Temp-Resistant Gel-Gap Filling- Also known as 'Black Magic' or 'C737'.
Brief Description
Permabond 737 is a high-performance, toughened, flexible, and temperature-resistant ethyl cyanoacrylate (CA) instant adhesive. It is specifically formulated as a black gel for gap-filling applications, offering improved impact, peel, and shear strength compared to conventional cyanoacrylates. It cures rapidly at room temperature without mixing or heat.
Popular Applications & Uses
- Bonding rubber anti-fatigue mats.- Assembly of vehicle boarding steps in buses and military vehicles.- Bonding antenna cables.- Automotive applications such as steering wheels and pedals.- Firework sealing.- Agricultural applications.- Bonding magnets.- Speaker assembly, including bonding the speaker surround to the cone and the cone to the spider.- General industrial bonding, gluing, adhering, encapsulating, joining, attaching, and assembling.- Small joint assembly.- Bonding dissimilar surfaces due to its flexibility.- Filling gaps and repairing damaged areas where a strong, flexible bond is needed.
Industries that Commonly Use It
- Aerospace/Defense- Automotive Service/Repair- Construction/Building Services (for specific component assembly and repair)- Electrical Services or Products- Fabrication (metal, plastic, rubber)- General Manufacturing- Government & Military- Industrial Supply- LED/Electronics- Marine- Medical Device/Prosthetics (for non-critical components, similar toughened CAs are medical grade)- Metal Fabrication- Plastic Fabrication- Transportation/Specialty Vehicle
Special and Unique Features
- **Toughened Formula:** Offers significantly improved impact, vibration, and peel resistance compared to standard cyanoacrylates.- **Flexible:** Provides maximum flexibility, making it ideal for bonding dissimilar surfaces and resisting thermal shock or differences in substrate expansion/contraction.- **Temperature Resistant:** Withstands higher temperatures (up to 120°C / 250°F) than typical CAs.- **Gap Filling:** Capable of filling gaps up to 0.5mm (0.02 inches).- **Black Color:** Jet black appearance, making it suitable for dark substrates and providing a clean finish.- **Fast Curing:** Cures in seconds, enabling fast handling times and high-speed production lines.- **Single Component:** No mixing required, easy to dispense by hand or automated equipment.- **100% Reactive:** Contains no solvents.
Key Properties
- **Chemical Composition:** Ethyl cyanoacrylate.- **Appearance:** Black gel.- **Viscosity:** High viscosity, gel-like consistency.- **Gap Fill:** Up to 0.5mm (0.02 inches).- **Temperature Resistance:** Up to 120°C (250°F). Minimum operating temperature -55°C (-65°F).- **Peel Strength:** High, typically 40-60 N/25mm.- **Impact Strength:** High, typically 5-10 kJ/m².- **Fixture/Handling Time:** Varies by substrate; e.g., 10-15 seconds for rubber, 5-10 seconds for plastics, 15-20 seconds for metals.- **Full Cure:** Achieved in 24 hours.
Surface Compatibility
- **Excellent adhesion to:** - Rubbers (especially suitable for rubber bonding) - Metals (aluminum, steel, zinc-plated steel) - Plastics - Composites- **With Permabond POP Primer:** Bonds very well to PTFE, PP, PE, and silicone.- **Surface Preparation:** Surfaces should be clean, dry, and grease-free. Degreasing with solvents like acetone or isopropanol is recommended. Light abrasion may benefit some metals like aluminum and copper.
Known backups / known substitutes
- **3M™ Scotch-Weld™ Rubber Toughened Instant Adhesives (e.g., RT5000B):** Similar toughened, high-viscosity, black cyanoacrylate adhesives designed for impact, vibration, and peel resistance.- **Loctite Toughened Instant Adhesives (e.g., Loctite 435, Loctite 411):** Offer high impact resistance, peel strength, and temperature resistance, with some being medical device grade or general-purpose gap-filling.- **Born2Bond Repair / Born2Bond Structural / Born2Bond Flex / Born2Bond Ultra:** High-viscosity, gap-filling cyanoacrylate adhesives, some of which are machinable, drillable, and paintable.- **Insta-Cure+™ (Gap Filling CA Glue):** A higher viscosity CA designed for loose-fitting joints and gap filling, often used in woodworking and hobby applications.
Comparison Note
Permabond 737 stands out among cyanoacrylate adhesives due to its unique combination of rubber toughening, flexibility, and high-temperature resistance, which are not typical characteristics of standard, more brittle CAs. Its black color and gel consistency for gap-filling further differentiate it, making it a robust solution for demanding industrial applications where shock, vibration, thermal cycling, and imperfect fit are concerns. While other brands offer toughened or gap-filling CAs, Permabond 737's specific blend of properties makes it a go-to for challenging bonding scenarios, especially involving rubber, metals, and plastics.
