Cyanoacrylate Glues

Examples:
Methyl 2-cyanoacrylate and ethyl-2-cyanoacrylate which are commonly known as SuperGlue and Krazy Glue
N-butyl cyanoacrylate, a veterinary glue
2-octyl cyanoacrylate is a medical grade glue

Often referred to as 'instant glues', and commonly know as super glue or Krazy Glue, cyanoacrylates are better used with non-porous materials and where there is a bit of moisture. Medical grade CAs have been used instead of sutures, often causing less scarring. Non-medical cyanoacrylates have also been used but this can be dangerous if over used.

Cyanoacrylates, in the presence of moisture turn into a polymer(plastic). Depending on the quality of the glue it can set anywhere from a second or two to a minute. Full cure time can be as much as several hours. Industrial grade cyanoacrylates will dry clear and flexible though most superglue and Krazy Glue will dry brittle. Sometimes these glues are referred to as anaerobic - meaning they react when the oxygen is taken away but this is incorrect. They actually react to the presence of water.

In addition to the presence of moisture, CAs need a very tight bond. They do not fill gaps. Fillers can be used successfully to fill gaps. Put a small bit of powder such as baking soda in a spot and add a few drops of cyanoacrylate and it will go very hard very quickly. Most of these fillers will not be waterproof though.

Caution: Although non toxic and biodgradable many can become sensitized to the fumes of cyanoacrylates. They are classed as an irritant. Use in a well ventilated area. Also, CAs will react with cotton producing an exothermic reaction which can burn. So, don't wear cotton gloves while using this type of glue.

Acetone is a solvent for Cyanoacrylates. If you use a nail polish remover make sure it is acetone based.

Cyanoacrylates were invented by mistake in 1942 by two gentelmen working for Eastman Kodak. They were trying to create a clear plastic suitable for gun sights. The glue was first marketed as Eastman 910.

Some of the better consumer products that you will find are Max One, Miracle Glue, The Last Glue and our very own Mister Glue

Other pages/articles that may interest you:
Types of Glue
Crafts and Models
Removing Super Glue