Matters to Be Observed When Using This Product

■ This product is intended for standard general-purpose use in electronic equipment, and is not designed for use in specific

environments described below. Using the product in such specific environments or service conditions, therefore, may

affect the performance of the product. Please check the performance and reliability of the product first before using the

product.

(1) The product characteristics may deteriorate in environments where the product is exposed to water, oil, direct sunlight,

ozone, UV-rays, radiant rays, etc. Do not use the product in these environments.

(2) High-humidity environment: When the capacitor is used in a high-humidity environment for a long period, moisture

permeates its outer case reaching internal elements as time goes by.

This moisture oxidizes a film deposit or spraying of metal, thus causing the capacitor problems. As a result of moisture

absorption, some types capacitors may have their capacitances increased.

(3) High temperature: There are cases where oil leaks from an ECQUG type capacitor used under high-temperature

conditions (70°C or higher). However, it rarely happens and does not affect the quality and reliability of the capacitor

at all. Nevertheless, avoid such a configuration in which the product and a component that may have a contact failure

caused by oil are incorporated together in the same circuit set. If you have any question, please feel free to contact us.

(4) Gaseous atmosphere: Avoid using the capacitor in an oxidizing gas, such as a hydrogen chloride gas, hydrogen

sulfide gas, and sulfurous acid gas. Using the capacitor in such a gaseous atmosphere results in oxidized film deposit

(aluminum) or spraying of metal (zinc) that may cause an ignition or smoking incident.

(5) Resin coat: If you intend to coat the capacitor with a resin for the purpose of improving its resistance to moisture and

gas or fixing a component, make separate inquiries to us about the matter.

A chemical solvent included in the resin permeates the metal sprayed parts or electrode (film deposit), which may

cause the degradation of the capacitor characteristics. When curing resin, the resin generates chemical reaction heat

(curing heat), which may have a negative influence on the capacitor.

When embedding the whole capacitor completely with a resin, sufficiently analyze/assess the effects of the

thermomechanical stress created by thermal expansion/shrinkage.

(6) See to it that no dust gets deposited on the product. Dust deposition on the product causes current leakage, etc.,

leading to a degradation of the product characteristics.

■ The effects of cleaning processes on the capacitor vary widely, depending on its structure and materials. Generally

speaking, the capacitor is hardly susceptible to a CFC-based solvent and an alcohol-based solvent but is affected by

a solvent with high polarity in some cases. In many cases, the capacitor with leads is covered with an outer casing

made of an epoxy resin highly resistant to chemicals and is therefore barely affected by a cleaner. We nevertheless

advise you to clean the capacitor as quickly as possible. A chip-type laminated film capacitor (ECHU, ECWU, ECPU)

is not protected with an outer jacket. During cleaning processes, solder flux or a cleaner deposited on an element of

the capacitor, may be activated and flow into the capacitor, causing a problem.

■ Ultrasonic cleaning may cause some problems, depending on the cleaner used and ultrasonic power output.

Such problems include peeling of protective film, separation of an electrode due to resonance, and degraded

capacitor characteristics. Make sufficient examinations/confirmations before carrying out ultrasonic cleaning.

■ As a result of strict regulations on CFC-based and chlorine-based solvents, cleaners not containing such solvents

have come into wide use. Some such alternative cleaners are, however, still harmful to the chip-type laminated film

capacitor and could be harmful under improper cleaning conditions. Examine the cleaner sufficiently before using it.

If you intend to use an alternative cleaner, please contact us in advance. Cleaning methods using an alternative cleaner

include a method in which a high-pressure spray of cleaner (water) hits against the board.

In this case, the water pressure may cause the protective film to peel off from the element surface.

Research the cleaning method before executing it.

■ Dry the cleaned capacitor sufficiently so that no cleaner remains thereon. An insufficient drying process allows the cleaner

to remain on the element surface, in which case measurement of the insulation resistance of the capacitor may indicate

an apparent drop in the insulation resistance.

■ A recommended cleaner is isopropyl alcohol (IPA), which is a general industrial reagent. Recommended cleaning

conditions include a cleaning temperature of 50°C and a cleaning time of 5 minutes or shorter, which apply equally to

immersion cleaning, vapor cleaning, and ultrasonic cleaning.

■ A list of cleaners that can be or cannot be used to clean the capacitor is shown on the next page. See the list for your

reference. If you are not clear about whether or not a cleaner can be used to clean the capacitor, make sure to contact us.

23-Apr-25

　Use environments

　Cleaning conditions

Matters to Be Observed When Using This Product

(Film capacitor)