Cyanoacrylate adhesives are solvent-free, one-part formulations that cure rapidly when pressed into a thin film between two substrates. Cyanoacrylate adhesives are generally methyl or ethyl cyanoacrylate-base, single component liquids. Cyanoacrylate adhesives bond well to many substrates. When bonding metals and other rigid surfaces, methyl cyanoacrylate bonds are stronger and more impact resistant than ethyl cyanoacrylate bonds. However, on rubber or plastic surfaces, ethyl cyanoacrylate is preferred.
RESULTING PROPERTIES
Cyanoacrylate adhesives cure rapidly at room temperature to form rigid thermoplastics with excellent adhesion to most substrates. Cyanoacrylates typically reach handling strength within one minute at room temperature and achieve full strength in 24 hours. A typical formulation for an ethyl cyanoacrylate adhesive is shown in the above table. Typically unmodified cyanoacrylate adhesives have a high lap shear strength, on the order of 2000-3000 psi, on most substrates. Typical bond strenght to low surface energy plastics are shown below.
