How tubular electric resistances are manufactured

The particular attention that GNALI BOCIA factories place in building tubular electric resistances is one of the key factors that guarantees long service life. 
The other important aspect is the right choice of materials constituting the tubular electric resistance which must resist against time and stresses due to intermittent operation. 
The starting component is the copper tube with a purity greater than 99% which is annealed in order to have a good heat deformability. The electric heating element which is the heart of tubular electric resistance and which defines the thermal power is placed inside. Remember that the items in the catalogue have power ratings ranging from 1000 to 3000 watts. 
The next step is to isolate the heater from the copper tube and this is carried out by the compacted magnesium oxide which fills all the spaces. The whole is then closed by sealing and fixing the heater tube to the flange. 
Sealing is important for a good lifespan of tubular electric resistances because it preserves the state of the insulating powder and prevents infiltration and moisture absorption, which lead to an increase in its electrical conductivity by creating a bridge between internal and external parts, thus dispersing electric current and inevitably triggering the safety switches of the household installation. 
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