GlueA glue it’s a product that is used for agglutinate and achieve the accession from one object to another. What the glue does, therefore, is paste. For instance: “I’m going to buy glue to fix the shoes.”, “The glue did not work: I could not join the pieces of the pot”, “If you don’t want to make a hole in the wall, you will need a good glue to adhere the painting by the window”.

The purpose of a glue is to make things stick together once their surfaces come into contact. This means that the objects in question they are neither crossed nor assembled, but are linked only thanks to the cap of glue.

Glues, on the other hand, may be intended for use in the home or have an industrial purpose. In the first case, mention can be made of the glues that children use in the school or office workers to paste papers. The industrial gluesOn the other hand, they allow to make more solid joints, which are very difficult to break.

Among the components that allow to create glues, are the rubber of natural origin, various polymers and even substances derived from dairy, corn and potatoes (or potato).

There are a wide variety of types of glue, some of which are listed below:

Glue* wet: only apply on one of the parts to be glued, having previously fixed both in the position adequate. This type of glue acts as soon as the solvents evaporate (there are, on the other hand, the so-called glues without solvents, which have water as a substitute for them). For best results, it is recommended to use porous materials, since they favor the drying process;

* contact: Unlike the previous type of glue, it must be applied to the two parts to be glued. To achieve adhesion, apply strong pressure and wait for the solvents to evaporate. Once this point is reached, the effect is immediate, in addition to producing a Union resistant to loads in a short time;

* reagents– Offered in one- or two-component versions, they act when a fault occurs. reaction that makes them harden, which can be physical, catalytic or chemical.

+ one-component reagents: the reaction occurs with oxygen in the air (aerobic), metal ions (anaerobes; It is used when the glue cannot come into contact with the air), the humidity present in the air or UVA rays. This kind of glue should only be applied to one of the faces that want to adhere and the reaction is instantaneous, once the second one acts. component, which can be one of those mentioned above;

+ two-component reagents: these do not depend on the environment, like the first, but are sold with two pasty, powder or liquid components that must be mixed in a certain proportion and manipulated within the indicated time (which is known as useful life) since they begin to harden immediately. It is necessary to hold the parts until they have fully adhered. The time that the process takes depends on the components and the environmental conditions;

* hot melt: They are sold in sheet, powder, granulate, net, stick or cartridge form. They generally do not require any extra steps (such as mixing) and do not contain solvents. To work, this type of glue must be subjected to high temperatures (from 110 ° C to 220 ° C, depending on the product) and can be applied with the help of a spray gun;

* self-adhesive: they maintain their adhesion capacity permanently and are used when a finish that lasts a long time is not desired. Some of the ways they are marketed, such as single or double sided tape, are very popular in educational and business settings.