What is the recommended pretreatment of an aluminum substrate?
The aluminum substrate can be pretreated by:
1) manual cleaning with nitro thinner, and then wiping with an abrasive fleece;
2) manual cleaning with a cold preparation, then rinsing with hot water and wiping …

Please list the causes of problems with the adhesion of coatings to zinc and galvanized steel substrates.:
1. The new zinc surfaces are smooth, oily or greasy, …

Wooden paving stone is a versatile floor covering. It consists of rectangular or round blocks, which, juxtaposed with each other, create a floor surface with extraordinary load capacity (high abrasion resistance). The faces of the blocks are pointing up.
The use of a wooden cube is possible in …

Spring-operated "separate function" control mechanism, used in fire ventilation cut-off dampers – current impulse control

In this type of mechanisms, the transition to the safety position is initiated by an electromagnetic release that releases the bolt of the spring drive of the damper., while moving to an item …

During normal operation of ventilation and air conditioning systems, fire dampers remain open, Fire ventilation cut-off dampers, however, remain closed. During the normal operation of the facility, both cut-off fire dampers and fire ventilation cut-off dampers, so they remain in a waiting position. …