Take care that the tip of solder iron will only contact pins or leadframe of the capacitor to avoid any possible damage of the capacitor.
Do not wash the assembled capacitors with the following cleaning agents:
•petroleum system solvents: may cause degeneration of the rubber seal material
•alkali system solvents: may cause corrosion and dissolve of the aluminum case
•halogenated solvents: may cause corrosion and failure of the capacitor
•acetone: component marking may be erased
•xylene: may cause deterioration of the rubber seal material
Verify the following points when washing is are applied to capacitors:
•Please monitor conductivity, ph-value, specific gravity and the water content of cleaning agents. Contamination adversely affects these
•Be sure to not expose the capacitors under solvent rich conditions or keep capacitors inside a closed container. In addition, please dry the
solvents on the PCB and the capacitor sufficiently with an air knife (temperature should be less than the maximum rated category tempe-
rature of the capacitor) for 10 minutes.
•Capacitors can be characteristically and catastrophically damaged by halogen ions, particularly by chlorine ions. The degree of the dama-
ge mainly depends upon the characteristics of the electrolyte and rubber seal material. When halogen ions come into contact with the in-
side of the capacitors, the foil may corrode, when a voltage is applied. This corrosion causes an extremely high leakage current, which re-
sults in venting and an open circuit defect.
All other cleaning processes and cleaning agents are not approved by Würth Elektronik eiSos. All cleaning methods need to be tested and vali-
dated by the customer.
1.12 Adhesives and Coating Materials
The usage of any adhesive or coating material, which is containing halogenated solvents, is not allowed.
Before applying adhesives or coating materials, make sure that the following points are fulfilled:
•Take care that the surface and capacitor is dry and clean before applying adhesive or coating, to avoid any contamination with flux residu-
es or cleaning solvents.
•Assure that no flux residue or spot is left between the rubber seal material of the capacitor and the PCB.
•Do not fully cover the entire rubber seal surface with adhesive, coating or molding materials. Otherwise the covering of the full rubber seal
surface may restrain the natural diffusion of hydrogen gas. Block maximum 80% of the sealed section of a capacitor.
•If the used adhesive, coating or molding material is containing halogen ions in a large amount, the halogen ions can diffuse and creep into
the capacitor and can damage the capacitor. Both above explained circumstances can result in serious failures.
•Follow the specified heating and curing instructions given by supplier of the used adhesive or coating material. Avoid excessive pressure
or heat on the capacitor by applying coating or adhesive.
•Take care that hardening of adhesive, coating material was correctly done, so that no solvents do remain.
•Be aware, that used solvents within adhesive and coating materials can damage the sleeve of the capacitor and can result in changes of
the appearance of the sleeve (color, shine and marking).
1.13 Mechanical Stress on lead wire and terminal
Do not stress the capacitor with the following actions:
•Applying any excessive force to the lead wire or terminal.
•Move or turn the capacitor after soldering to the PCB.
•Bending pins after soldering.
•Carrying the PCB by picking / holding the board via a capacitor.
1.14 Operation and Usage of the Capacitor
In operation and usage take care about the following points.
Do not use the capacitor within the following environmental conditions:
•Environment with high mechanical stress / shocks or vibration (please see this specific datasheet for permitted limits).
•Environment with high amount of damp condensation, water or types of oil.
•Direct sunlight, ozone, any kind of radiation or ultraviolet rays.
•Toxic gases (e.g. ammonium, chlorine and compounds, bromine and compounds, hydrogen sulfide, sulfuric acid).
User should never touch the terminals of the capacitor directly.
Avoid short circuit between terminals with any kind of conductive material (e.g. metal, fluid, acid, alkaline solution).
For industrial applications it is recommended to perform periodic inspections. Power supplies shall be turned off before inspection to dischar-
ge the capacitor. Check the following points in case of an inspection:
•Visual inspection of the capacitor to see, if the vent operated for pressure relief and if any leakage of electrolyte has taken place.
•Measurement of electrical characteristics of the capacitor (according to datasheet, especially leakage current, capacitance and dissipati-
In case of deviation or failure according to the specified characteristics, take care to start appropriate actions (e.g. replacement of capacitor).
I Cautions and Warnings (2):
The following conditions apply to all goods within the product series of WCAP-ATUL
of Würth Elektronik eiSos GmbH & Co. KG:
This electronic component has been designed and developed for usage in general electronic equipment only. This product is not authorized for use in equipment where a higher safety standard and reliability standard is especially required or where a failure of the product is reasonably expected to cause severe personal injury or death, unless the parties have executed an agreement specifically governing such use.
Moreover Würth Elektronik eiSos GmbH & Co KG products are neither designed nor intended for use in areas such as military, aerospace, aviation, nuclear control, submarine, transportation (automotive control, train control, ship control), transportation signal, disaster prevention, medical, public information network etc.. Würth Elektronik eiSos GmbH & Co KG must be informed about the intent of such usage before
the design-in stage. In addition, sufficient reliability evaluation checks for safety must be performed on every electronic component which is used in electrical circuits that require high safety and reliability functions or performance.