Aluminum Electrolytic Capacitors (Radial lead Type)

2.8 Circuit board cleaning

(1) Circuit boards can be immersed or ultrasonically cleaned using suitable cleaning solvents for up to

5 minutes and up to 60 ℃ maximum temperatures. The boards should be thoroughly rinsed and dried.

The use of ozone depleting cleaning agents is not recommended for the purpose of protecting our

environment.

【Target solvent】

Pine Alpha ST-100S, Aqua Cleaner 210SEP, Clean-thru 750H / 750L / 710M, Sunelec B-12,

Sunelec B-12, Cold Cleaner P3-375, Techno Cleaner 219, DK Be-clear CW-5790,

Telpene Cleaner EC-7R, Technocare FRW-17 / FRW-1 / FRV-1

(2) Avoid using the following solvent groups unless specifically allowed in the specification ;

(a) Halogenated based solvents ： may permeate the seal and cause internal corrosion.

Especially, 1-1-1 trichloroethane must not be used on any aluminum electrolytic capacitors.

(b) Alkaline based solvents ： may dissolve and react to the aluminum case.

(c) Petroleum based solvents ： may deteriorate the sealing rubber.

(d) Xylene

： may deteriorate the sealing rubber.

(e) Acetone

： may erase the markings.

(3) A thorough drying after cleaning is required to remove residual cleaning solvents that may be trapped

between the capacitor and the circuit board. Avoid drying temperatures, which exceed the upper category

temperature of the capacitor.

(4) Monitor the contamination levels of the cleaning solvents during use in terms of electrical conductivity,

pH, specific gravity, and water content. Inside the capacitor may corrode with high density of chlorine.

Control the flux density in the cleaning agent to be less than 2 mass%.

(5) Depending on the cleaning method, the marking on a capacitor may be erased or blurred.

※ Please consult us if you are not certain about acceptable cleaning solvents or cleaning methods.

2.9 Mounting adhesives and coating agents

When using mounting adhesives or coating agents to control humidity, avoid using materials containing

halogenated solvents. Also, avoid the use of chloroprene based polymers.

Cure or dry out the coating agents thoroughly, and do not leave any solvents. Make sure to dry out cleaning agents

completely immediately after washing the circuit board if the capacitors are mounted afterward, so that the solvents

are not left under the capacitor body. Also, leave more than 1/3 of the sealing portion open, and do not cover that

portion with any adhesives or coating.

2.10 Potting and molding

Potting and molding processes cannot be recommended. They have potential risks to change the capacitor’s

performance and reliability due to injection pressure, diffused material into the capacitor, as well as heat

accumulation by covered resin. Also, evaporated electrolyte may remain inside the resin, then turn to liquid, and

possibly short circuit PCB patterns.

2.11 Fumigation

In exporting electronic appliances with aluminum electrolytic capacitors, in some cases fumigation treatment

using such halogen compound as methyl bromide is conducted for wooden boxes.

If such boxes are not dried well, the halogen left in the box is dispersed while transported and enters in the

capacitors inside. This possibly causes electrical corrosion of the capacitors. Therefore, after performing fumigation

and drying make sure that no halogen is left. Don’t perform fumigation treatment to the whole electronic

appliances packed in a box.

2.12 Flux

If you use a halogen type (Chlorine type, Bromine type, etc.) high-activity flux, please use it after confirmation

in advance, as it may have an impact on performance and reliability of this product due to the residue of the flux.

3. Precautions for using capacitors

3.1 Environmental conditions

Capacitors should not be stored or used in the following environments.

(1) Exposure to temperatures above the upper category or below the lower category temperature of the capacitor.

(2) Direct contact with water, salt water, or oil.

(3) High humidity conditions where water could condense on the capacitor.

(4) Exposure to toxic gases such as hydrogen sulfide, sulfuric acid, nitric acid, chlorine, chlorine compound,

bromine, bromine compound or ammonia.

(5) Exposure to ozone, radiation, or ultraviolet rays.

(6) Vibration and shock conditions exceeding specified requirements.

Even within the specified requirements, a large vibration acceleration may be applied due to resonance,

so be sure to evaluate and confirm with the actual product.

01-Oct-21