Capacitor production humidity requirements specification

What humidity is required for a film capacitor?

humidity of 50 % ± 2 % are mandatory. Regarding solderability, our products comply with “IEC 60384-1” and the additional type specifications. For all capacitors, we refer to the paragraph “Soldering Conditions” in the type specifications. For more detail, we refer to the document “Soldering Guidelines for Film Capacitors”:

What is the relative humidity coefficient of a capacitor?

βc The values of given in table are valid for a relative humidity range of 50% to 95%. At relative humidity below 30%, the humidity coefficient is relatively low. Wide variations are to be expected at relative humidity above 85%. Figure 11 shows typical capacitance/humidity characteristics of different capacitor styles.

How does humidity affect the capacitance of a plastic film capacitor?

The capacitance of a plastic film capacitor will undergo a reversible change of value in relation to any change in the ambient humidity. Depending on the type of capacitor design, both the dielec-tric and the effective air gap between the films will react to changes in the ambient humidity, which will thus affect the measured capacitance.

How does humidity affect a capacitor?

The absorption of moisture increases the number of permanent dipoles inside the capacitor, pro-ducing reversible effects on capacitance, dissipation factor and insulation resistance, which are treated in the respective sections. These occur for relative humidity less than 93%, applied for a limited time, and can be reversed by a drying process.

How does temperature and humidity affect K1 of a film capacitor?

TABLE 4. Capacitance loss parameters of film capacitor samples. k1 increases with the increasing temperature and humidity due to the acceleration of the electrochemical corrosion of electrodes and more sufficient moisture. The effects of temperature and humidity on k1 could be analysed by Peck's model [ 16 ].

Does humidity affect the capacitance of polypropylene capacitors?

Irreversible effects due to humidity are described in section 4.3. As figure 12 shows, in polypropylene capacitors (PP MKP, MFP), the capacitance remains vir-tually unaffected by frequency up to 1 MHz. In polyester capacitors (PET MKT) and especially in PEN capacitors (polyethylene naphthalate, MKN), the effect of frequency is more noticeable: