For the usual activated products, this content is of the order of 0.6 to 0.3 mol water per mol alumina and their specific surface, measured' by nitrogen adsorption at-l95' according to the BET. method, attains 200 to 250 sq. meters per gram, which corresponds to an excellent activity.
Octyl cyanoacrylate was developed to address toxicity concerns and to reduce skin irritation and allergic response. Cyanoacrylate adhesives are sometimes known generically as instant glues, power glues or superglues (although Super Glue is a trade name). The abbreviation CA is commonly used for industrial grades.
Currently, there are five basic types of glue. 1  Solvent glues comprise an adhesive base mixed with a chemical solvent that makes the glue spreadable; the glue dries as the solvent evaporates. 2  Water-based glues use water as a solvent instead of chemicals. Two part glues include epoxy and resorcinol, a crystalline phenol that can be synthesized or made from organic resins. One part contains the actual glue; the other part is a catalyst or hardener. Animal hide glues are useful for woodworking and veneer work.