• Item Name: PERMABOND® HM128
• Manufacturer: Permabond
• Technologies: Methacrylate esters, anaerobic adhesive
• Color: Red
• Cure Type: Anaerobic, room temperature
• Package Size: Contact to Techniq VN for details.
• Shelf Life: Contact to Techniq VN for details.
PERMABOND® HM128 is a high-strength anaerobic threadlocker designed for permanent assembly of threaded fasteners. It prevents vibration loosening, provides corrosion protection, and cures to a tough thermoset plastic at room temperature in the absence of air and in contact with metal. It is tested against MIL-S-46163A Type I Grade K and ASTM D5363 standards, making it suitable for demanding industrial and military applications.
Permanent locking of bolts, studs, and cap screws.
Machinery, equipment, and electric motor manufacturing.
Replacement for lock washers and mechanical threadlocking methods.
Use in environments exposed to vibration, chemicals, and temperature fluctuations.
| Property | Value |
|---|---|
| Chemical composition | Methacrylate esters |
| Appearance | Red |
| Viscosity @ 25°C | 500 mPa·s |
| Specific gravity | 1.09 |
| Maximum gap fill | 0.15 mm (0.006 in) |
| Maximum thread size | M20 (¾”) |
| Handling time (steel) | ~15 minutes |
| Full strength | 24 hours |
| Property | Value |
|---|---|
| Torque strength (ISO 10964, M10 steel) | Break: 31 N·m (275 in·lb) Prevail: 40 N·m (350 in·lb) |
| Shear strength (ISO 10123, steel collar & pin) | 17 MPa (2500 psi) |
| Coefficient of thermal expansion | 90 × 10⁻⁶ /°C |
| Thermal conductivity | 0.19 W/(m·K) |
| Dielectric strength | 11 kV/mm |
| Electrical resistance | 10¹⁷ Ω |
| Temperature resistance | -55°C to ~150°C continuous; brief exposure higher |
| Chemical resistance (340h at 75°C) | Water: 98% Butyl alcohol: 94% Toluene: 98% Motor oil: 100% Hydrocarbon fluid: 96% JP4 jet fuel: 100% JP5 jet fuel: 90% Ethylene glycol: 96% |
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