How to choose Cleaning Solution

Cleaning solution

The cleaning solution is selected according to the type of contamination and workpiece material.

Contaminants include oil, flux, abrasives, mold release agents, and particulates. Materials targeted include metals (iron, aluminum, stainless steel, etc.), resins, and inorganic materials (glass, semiconductors, sintered materials).

Cleaning solutions are broadly classified into aqueous and non-aqueous systems.

Aqueous cleaning solutions include neutral and alkaline cleaning agents. They are nonflammable and relatively easy to handle, but require frequent rinsing, are difficult to dry and stain easily, and require wastewater treatment.

Nonaqueous cleaning solutions include hydrocarbon-based and solvent-based (fluorinated, brominated, alcohol-based) cleaningagents, which have high solubility and good drying properties, but some are flammable. Although an initial cost is required, the cleaning solution can be regenerated by using a distillation/regeneration system.

The final selection should be made based on the company's enlightened thinking about the work environment and environmental impact.

■Types of cleaning solutions

Type Cleaning solution Purpose Feature
Aqueous

Alkaline Degreasing, swarf, dust No fire hazard due to non-flammability
Surfactant is the main ingredient
Requires wastewater treatment
Neutral
Acidic Descaling
Cleaning before plating
Hydrocarbon-based Isoparaffinic Degreasing
Flux
Inflammable but has a high flash point
Inexpensive and recyclable
Low toxicity and low impact on the human body
Normal paraffin-based
Solvent-based Fluorinated Degreasing, swarf, dust High solubility and good drying properties
Expensive but recyclable
Bromine series High solubility and good drying properties
Expensive but recyclable
Alcoholic Flammable but dries well
inexpensive

*Depending on the type of cleaning solution, an indirect tank may be required, or the equipment may require anti-flammability measures or exhaust ventilation.

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