Product Name
Permabond MT3821 Medium Set 10 - 20 min Modified Two Component Epoxy Black Cartridge And Accessories
Brief Description
Permabond MT3821 is a 2:1 ratio, two-part, modified epoxy adhesive engineered for sealing, bonding, and encapsulation applications. It cures to a soft, flexible, rubber-like finish, offering outstanding adhesion to a wide variety of substrates including plastics, composites, and metals. This thixotropic paste formulation allows for non-sag vertical applications and cures efficiently at room temperature.
Popular Applications & Uses
- Sealing and bonding metal, composite, and plastic housings.- Electronic component encapsulation and vibration damping.- Creating flexible structural joints in equipment and machinery.- Potting small electronic modules.- General industrial maintenance and assembly bonding.
Industries that Commonly Use It
- Aerospace/Defense- Automotive Service/Repair- Construction/ Building Services- Electrical Services or Products- Energy (e.g., Wind Turbines)- Fabrication- General Manufacturing- LED/Electronics- Marine (e.g., Boat Building)- Metal Fabrication- Plastic Fabrication- Transportation/ Specialty Vehicle (e.g., Trains, Trams, Specialty Vehicles)
Special and Unique Features
- Cures to a soft and flexible film, ideal for vibration damping and stress absorption.- Offers outstanding adhesion to diverse substrates, including various plastics, composites, and metals.- Achieves full cure at room temperature, simplifying integration into production processes.- Features a non-sag, thixotropic consistency, making it suitable for vertical and overhead applications.- Provides excellent peel and impact resistance.- Exhibits good chemical and moisture resistance, suitable for harsh environments.- Is non-corrosive and electrically insulating, making it ideal for sensitive electronic assemblies.- Complies with RoHS and REACH regulations.- Formulated for low outgassing.
Key Properties
- **Product Type:** Two-part, modified epoxy adhesive.- **Mix Ratio (by volume):** 2:1 (Resin:Hardener).- **Appearance (Mixed):** Black.- **Viscosity @ 25°C:** Thixotropic paste (Component A: 200,000 cP, Component B: 100,000 cP).- **Pot Life @ 25°C:** 10–20 minutes.- **Handling Time:** 60–90 minutes.- **Full Cure @ 25°C:** ≥72 hours.- **Maximum Gap Fill:** 5 mm (0.2 in).- **Shear Strength (Aluminum):** 6–8 N/mm² (900–1200 psi).- **Elongation at Break:** 100–150%.- **Hardness:** 55–85 Shore A / 20–30 Shore D.- **Peel Strength (Aluminum):** 140–160 N/25 mm (31–36 PIW).- **Temperature Range:** -40°C to +120°C (short-term higher).- **Impact Strength (ASTM D-950):** 30-40 KJ/m².
Surface Compatibility
- Nylon- ABS- Polycarbonate- PVC- FRP (Fiber Reinforced Plastic) and Carbon Fiber Composites- Aluminum and Aluminum alloys- Mild Steel- Stainless Steel- Copper and Copper alloys- Acrylic (PMMA)- PEEK
Known backups / known substitutes
- Permabond MT382 (a related, potentially lower viscosity version).- Other two-part modified epoxy adhesives with similar flexibility and adhesion characteristics.- Silicone-modified epoxy potting compounds, such as GS Polymer SM 1001-3FR or SM 2000-1, for specific potting and encapsulation needs.- Other structural adhesives like polyurethanes or methacrylates, depending on the required flexibility, strength, and cure speed.- 3M Scotch-Weld epoxies (as a general category of two-part epoxies).
Comparison Note
Permabond MT3821 is distinguished as a modified two-part epoxy that uniquely combines strong adhesion across diverse substrates (metals, plastics, composites) with a soft, flexible cured state. This inherent flexibility is critical for applications demanding vibration damping, stress absorption, and superior peel/impact resistance, setting it apart from more rigid structural epoxies. Its thixotropic nature further enhances its utility for vertical and overhead applications where sag resistance is paramount.
