The Loctite 229812 4981 is a medium viscosity, one-part, room temperature cure instant adhesive designed to resist thermal cycling and humidity. It bonds thermoplastics, thermoset plastics, metals, and elastomers, including rubber, and is ISO-10993 biologically tested for medical device use.

Loctite 4981 is a transparent, colorless to pale yellow ethyl cyanoacrylate liquid adhesive suitable for applications requiring heat resistance. It is formulated to resist thermal cycling and exhibits superior resistance to humidity. Suitable for use in the assembly of disposable medical devices, it has been qualified to Henkel's ISO 10993 Protocol.