The following materials are currently used in the manufacture of brushes:
1) natural bristles (swine);
2) natural hair (horse, of the marten, badger, with an ox, coward, squirrel, the bears, goat);
3) fiber fibers;
4) artificial bristles (polyester, nylon, a pearl);
5) …
A different solution from the one discussed above are the multi-plane dampers. They allow the use of knees, arches and offsets right behind the hatch. However, pay attention, that the multi-blade fire dampers currently available on the Polish market are made of steel sheet. In relation with …
Wooden cubes in the outer area.
Wooden paving stones to be placed outside the building are distinguished as square and round. The square block consists of sections of rectangular beams or sleepers. The round cube is made of machine-peeled softwood logs.
WITH …
Hardened PVC is often used for the production of plastic windows and gutters. What coating materials can be applied to this material? What requirements should these coatings meet?
The following materials are suitable for rigid PVC components, giving coatings o …
Warm airtight walls are the first link in the technological chain, the basis of the Passive House concept is the saving of thermal energy, which is easiest to implement thanks to well-chosen construction material and well-insulated external walls of the building. The U heat transfer coefficient for such a wall should be smaller …
Within plastics, a distinction is made:
1) plastomery – termoplasty i duroplasty (thermosetting and chemically setting);
2) elastomery.
The production of plastics is based on two types of chemical reactions. As a result of them, macromolecules are formed from small monomer molecules. What are these …
Wooden window profiles should be made in a way that ensures water drainage. What minimum angle of inclination is required here?
The minimum angle of inclination of the window profiles is 15 °, an angle of 30 ° is preferred.
To ensure a sufficiently thick layer of coating on the edges of window profiles, all …
Sand-lime brick
What properties should a lime brick wall have–sand, if it is intended to be covered with a permanent coating?
The substrate should be firm, clear, with no scratches, seek, free of efflorescence and foreign bodies.
What are the disadvantages of a sand-lime brick facade? …
Brick and clinker
What is the difference between clinker and ordinary brick?
Bricks are made of clay and loam, with or without slimming admixtures, and then burns out. A distinction is made between the facing brick and the brick used on the inside. Only facing brick …
Previously painted steel doors in stock are to be repainted. The old coating is made of lacquer on alkyd resins. The study showed, that approx. 65% the coating comes off. Please list and justify the necessary painting activities.The steps are as follows:…