Plastics react differently to solvents. What could be the influence of solvents on these materials?? By acting with a solvent on the plastic, you can them:
1) dissolve;
2) loosen;
3) unfold;
4) saturate with solvent, which will be absorbed by them …

Various species of exotic wood are not suitable for applying water-soluble coatings, as these coatings give the wood a yellowish tint. What kinds of wood are we talking about?? The staining of the wood by water-soluble paints occurs with the following types of wood: aphromosis, …

Solid wood

What humidity the wood can have when coating is applied? While painting, coniferous wood in the external elements should have a humidity of max. 12%. When painting interior parts, the wood humidity may be max. 10%, and in rooms with central heating it should not …

Copper

How patina is formed on copper?
Firstly, the copper surface oxidizes in air, forming a brown layer of copper oxide. Then, under the action of carbonic acid contained in the air, a water-insoluble copper carbonate is formed, that is, a patina of green color.

Why in polluted by …

The alkaline reaction of the concrete protects the reinforcing steel against corrosion. Where does this alkaline reaction come from??
During the hydraulic hardening of cement, which is a binder in concrete, a significant amount of calcium hydroxide is formed (lime lye). It is calcium hydroxide that is the source of the alkaline reaction of concrete.

What value should …

Inside the room, on a brick wall, dark joints are marked between the wall blocks.
What is a cause of it?
There are so-called. thermal bridges. Due to the insufficient thermal insulation properties of the wall, mortar joints are visible on it. Due to increased flow …