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Basic Technical Data For Capacitors

1.1 Classification by dielectric
The characteristics and application possibilities of film capacitors are affected so strongly by the dielectric used that capacitors are grouped and designated according to the type of dielectric. Short identification codes for the type of construction, describing the dielectric and the basic technology applied, are defined in standard DIN 41379.

The last character of the short code indicates the type of dielectric:
T=Polyethylene terephthalate (PET)
P=Polypropylene (PP)
N=Polyethylene naphthalate (PEN)
An M (=metallization) is prefixed to the short identification code of capacitors with metallized films.

Figure 1 Classification of film capacitors in DIN 41379
*) MFP and MFT capacitors are constructed using a combination of metal foils and metallized plastic films. They are not covered by DIN41379.

1.2 Classification by film and foil arrangements
For a better understanding of the differences in the internal structure of capacitors, figure 2 shows some typical film and foil arrangements.

Figure 2 Examples of typical film and foil arrangements

Figure 3 shows the relation between various film/foil arrangements and the capacitor types.

Figure 3 Schematic film and foil arrangements of various capacitor types

1.3 Classification by construction
Hengrong capacitors are produced using either winding methods.

1.3.1 Wound technology
In the conventional production process, capacitors are made by individually rolling the metallized films or the film / foils into cylindrical rolls and then covering them with an insulating sleeve or coating.

Figure 4 Conventional production process in wound technology

In the MKT, MKP and MFP type series, our production range includes capacitors with space-saving flattened wound bodies with insulating coatings or inside plastic casings, as well as cylindrical wound capacitors. Flat windings are produced by compressing the cylindrical rolls before they are placed in casings, so that the casing form is optimally used.