Product Description

LOCTITE® 401™ is a general-purpose ethyl cyanoacrylate instant adhesive built as a reliable default across a broad range of substrates, and it functions as the baseline reference point for the rest of the LOCTITE® cyanoacrylate family. Where LOCTITE® 406™ is tuned specifically for plastics and rubbers, and LOCTITE® 410™ trades speed for rubber-toughened gap-filling strength, 401™ handles difficult-to-bond materials that need uniform stress distribution and strong tension or shear strength across metals, plastics, and elastomers — while also bonding porous materials such as wood, paper, leather, and fabric. It's registered to NSF Category P1 for use as a sealant in food processing areas without direct food contact, a regional approval worth checking against your customer's specific market.

How It's Used

Bond areas should be clean and free from grease — a LOCTITE® cleaning solvent works well for prep. On low-energy plastic surfaces, a LOCTITE® primer can improve adhesion, and an activator can be used where cure speed needs a boost, though this can reduce ultimate bond strength. Adhesive is applied to one bond surface only, the parts assembled within a few seconds and accurately located, then held or clamped until the adhesive fixtures. Full service strength typically develops within 24 to 72 hours, depending on bond gap, materials, and ambient conditions.

LOCTITE® 401™ is not recommended for pure oxygen or oxygen-rich systems, or as a sealant against chlorine or other strong oxidizers.

Storage

Store in the original, unopened container in a dry location. Optimal storage is 2°C to 8°C — storage below 2°C or above 8°C can affect product properties. Material removed from the container should not be returned to it once it may have been contaminated during use.

Safety

This page summarizes performance data only. Consult the Safety Data Sheet (SDS) for full handling, storage, and safety information before use.

LOCTITE® is a trademark of Henkel Corporation in the U.S. and elsewhere.