Description
Permabond MT3821 is a two-part, 2:1 modified epoxy adhesive engineered for sealing, bonding, and encapsulation applications requiring flexibility and environmental durability. It offers outstanding adhesion to a wide variety of substrates—including nylon, ABS, polycarbonate, metals, and composites—while curing to a soft, rubber-like finish that absorbs stress and vibration.
This thixotropic paste formulation allows for non-sag vertical applications, making MT3821 ideal for both manual assembly and automated dispensing systems.
Key Features & Benefits
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Soft and flexible cured film ideal for vibration damping
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Adhesion to diverse substrates including plastics, composites, and metals
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Room-temperature cure for easy integration into production processes
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Non-sag thixotropic consistency for overhead or vertical bonding
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Excellent peel and impact resistance
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Chemical and moisture resistance suitable for harsh environments
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Non-corrosive and electrically insulating, ideal for sensitive assemblies
Common Applications
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Sealing and bonding metal, composite, and plastic housings
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Electronic component encapsulation and vibration damping
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Flexible structural joints in equipment and machinery
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Potting small electronic modules
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Industrial maintenance and assembly bonding
Technical Specifications
| Property | Value |
|---|---|
| Mix Ratio (by volume) | 2:1 |
| Viscosity (A/B) | 200,000 / 100,000 cP (thixotropic paste) |
| 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) |
(Data from manufacturer technical datasheet.)
Compliance & Handling
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RoHS and REACH compliant
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Non-corrosive, low-outgassing formulation
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Safe for electrical and electronic assemblies
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Recommended storage: 5–25°C (41–77°F)
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Not recommended for use with strong oxidizers
Compatible Substrates
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Nylon, ABS, PVC, and Polycarbonate
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FRP and Carbon Fiber Composites
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Aluminum, Mild Steel, and Stainless Steel
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Acrylic, Wood, and Concrete
Packaging & Ordering
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Available in 50 ml and 400 ml dual cartridges (2:1 mix ratio)
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Compatible with static mixing nozzles and dispensing guns
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Bulk packaging options available for production use
Related Products
Get Expert Help
For help selecting the right modified epoxy for your bonding or potting application, contact Chemical Concepts at [email protected] or 800-220-1966.
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