Process Chemistry Guide
The best industrial cleaning chemical is not simply the strongest product. It is the chemistry that removes the production soil at a practical concentration and temperature while protecting the substrate, supporting the equipment and leaving the surface ready for the next operation.
1. Identify the soil—not just the part
Start by documenting every material that must be removed: machining oil, drawing compound, coolant, buffing compound, fingerprints, particulate, oxide, adhesive, carbon or mixed shop contamination. Determine whether the soil is fresh or aged, light or heavy, and whether it changes during production.
A product that removes one oil may perform poorly against another. Obtain the soil’s product name or safety data sheet when possible, and provide realistically contaminated parts for testing.
2. Confirm substrate compatibility
Steel, stainless steel, aluminum, titanium, magnesium, copper alloys, zinc, plated surfaces, plastics and elastomers do not have the same chemical tolerance. Consider every material in the assembly, including brazing alloys, coatings, adhesives, seals and identification marks.
Compatibility is affected by concentration, temperature, exposure time, agitation and contamination loading. A short coupon test is helpful, but production testing should also examine staining, etching, darkening, hydrogen concerns, dimensional change and effects on subsequent operations.
3. Match the chemistry to the cleaning method
The equipment changes how a chemical performs. Spray washers require controlled foaming and good impingement behavior. Immersion systems may use circulation, agitation or ultrasonics. Ultrasonic processes need chemistry that wets complex surfaces, supports cavitation and releases contamination without excessive foam. Solvent cleaning may be appropriate when rapid drying, water sensitivity or difficult nonpolar soils make an aqueous process impractical.
Review the available industrial cleaning systems and determine whether the process will use spray, immersion, ultrasonics, vapor solvent, blasting or a combination of mechanisms.
4. Define what the surface must be ready for
Cleaning is often preparation for plating, coating, welding, bonding, heat treatment, passivation, inspection or final assembly. A surface can appear clean yet retain residue that interferes with adhesion, corrosion resistance or validation.
Specify the next operation and acceptance method. This may change the preferred cleaner, rinse sequence and water quality. Low-residue products and adequate rinsing are particularly important when the part proceeds to a sensitive finishing or validated process.
5. Plan rinsing, drying and corrosion control
Aqueous cleaning transfers soil into the bath and usually requires one or more rinses. Determine whether tap water is acceptable or whether the final rinse requires deionized or purified water. Consider drag-out, rinse conductivity, spotting and drying time.
Ferrous parts may need temporary rust inhibition between cleaning and the next operation. The inhibitor must be compatible with downstream coatings or other requirements. Review available rust inhibitors and preventatives as part of the total process rather than as an afterthought.
6. Verify approvals, safety and environmental requirements
Some aerospace and customer-controlled processes require an approved product or documented conformance. Confirm the exact specification, revision and intended use rather than relying only on a general “aerospace approved” claim. eChem maintains a focused selection of aerospace-approved cleaning products for applicable processes.
Also evaluate worker exposure, ventilation, wastewater, air-quality restrictions, storage, transportation and disposal. A lower-use-temperature or longer-life chemistry may reduce total operating cost even when its purchase price is higher.
7. Compare process cost, not price per gallon
Calculate usable concentration, bath volume, bath life, replenishment, energy, labor, rinse-water demand, filtration, waste and rejected parts. A concentrate that runs at a lower concentration or maintains performance under higher soil loading may cost less per cleaned part.
Bath management should include simple controls such as concentration checks, temperature limits, oil removal, filtration and scheduled testing. Without controls, even a well-selected product can become inconsistent.
8. Test with representative parts
A useful evaluation compares candidate chemistry under realistic time, temperature, concentration and mechanical-action conditions. Examine cleanliness, substrate condition, rinsability, drying, downstream performance and bath behavior. When possible, include intentionally difficult parts and aged contamination.
Information to provide during a chemistry review
- Part materials, coatings, dimensions and geometry
- Soil identity, condition and approximate loading
- Current equipment, time, temperature and concentration
- Required cleanliness and downstream operation
- Water quality, rinsing and drying method
- Applicable customer, aerospace, environmental or safety requirements
- Current failure mode, cost or production constraint
Explore industrial cleaners and degreasers, cleaning solvents, passivation chemistry and other process chemicals.
Match chemistry to your complete process
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