Loctite 401 vs Loctite 406
General-purpose cyanoacrylate vs low-viscosity grade for plastics and rubber.
// Key differences
- Substrates: 401 bonds metals, wood, porous and acidic surfaces; 406 is optimised for plastics and elastomers (EPDM with primer).
- Viscosity: 406 is thinner and wicks into tight gaps; 401 fills slightly larger gaps.
Choose Loctite 401 for:
Mixed or porous materials, metal parts.
Choose Loctite 406 for:
Rubber O-rings, plastics, close-fitting parts.
Full specification comparison
| Parameter | Loctite 401 | Loctite 406 |
|---|---|---|
| Manufacturer | Henkel (LOCTITE) | Henkel (LOCTITE) |
| Category | Adhesives & Threadlockers | Adhesives & Threadlockers |
| Temperature range | -40°C … +120°C | -40°C … +120°C |
| Standards / approvals | NSF P1 | ISO 10993 |
| Chemistry | Ethyl cyanoacrylate | Ethyl cyanoacrylate |
| Operating temperature | -40°C … +120°C | -40°C … +120°C |
| Strength | Shear 18–26 N/mm² (steel) | Very fast on plastics/elastomers |
| Fixture time | 5–20 s | <10 s (EPDM) |
| Viscosity | 70–110 mPa·s | 12–22 mPa·s |
| Specification | NSF P1 | ISO 10993 |
| TDS & quote | TDS & quote |
Data compiled from manufacturer data sheets — confirm critical values with the official TDS.
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