Leaded soldering is still used in industries like industrial control, medical devices, and aerospace. If your product falls into these sectors, you may be asking: which EMS manufacturers offer aqueous cleaning services for leaded PCBA?
Which Industries Still Use Leaded Soldering?
While consumer electronics has shifted to lead-free processes, the following sectors still use leaded soldering for reliability and technical reasons:
- Industrial Control Equipment: PLCs, VFDs, industrial robot controllers
- Medical Devices: Patient monitors, diagnostic equipment
- Aerospace: Electronic systems in extreme environments
- Infrastructure: Railway signaling, power dispatch systems
Technical Advantages:
- Lower soldering temperature (183°C vs 217°C for lead-free), reducing thermal stress on components
- Better solder joint reliability
- Decades of application history and failure data
Types of EMS Suppliers Offering Leaded PCBA Cleaning Services
EMS Manufacturers Focused on High-Reliability Applications
These suppliers are your best choice. They primarily serve industrial, medical, and aerospace sectors, maintaining dedicated leaded production lines and cleaning equipment.
Representative Suppliers: EMS manufacturers like Venture Electronics that specialize in high-reliability manufacturing.
Characteristics:
- Relevant quality certifications (automotive, medical, aerospace)
- Dedicated leaded production lines to avoid cross-contamination with lead-free processes
- Complete cleaning verification capabilities
Traditional Industrial Electronics Manufacturers
Long-serving suppliers to industrial control, power, and railway industries, with equipment primarily for leaded soldering.
Characteristics:
- Leaded processes are their mainstay
- Deep understanding of industrial application requirements
- May lack modern process optimization capabilities
Small Size EMS Factories Offering Custom Services
High flexibility, able to configure leaded production lines based on requirements, though they may lack the rigorous, standardized quality controls of dedicated high-reliability manufacturers.
Characteristics:
- High acceptance of small-batch orders
- Varying levels of leaded process experience
- Need to carefully verify cleaning validation capabilities
Venture Electronics’ Leaded PCBA Cleaning Services
As an EMS manufacturer focused on high-reliability applications, Venture Electronics provides complete leaded PCBA solutions.
Leaded Soldering Process Capabilities
Venture Electronics uses leaded nitrogen vacuum reflow soldering:
Process Advantages:
- Nitrogen-protected environment reduces soldering oxidation
- Vacuum environment reduces solder joint void rate to <2%
- Precise temperature control (±1°C)
Actual Results:
- Reduced flux activity requirements and residue
- Many projects can use no-clean processes directly
- Even when cleaning is needed, total contamination is significantly reduced
Learn more about nitrogen vacuum reflow soldering
Cleaning Service Capabilities
Appropriate cleaning solutions based on your flux type:
If you use water-soluble flux:
- Venture Electronics provides aqueous cleaning services
- Uses deionized water systems
- Thorough drying to avoid residual moisture
If you use no-clean flux:
- Aqueous cleaning with pure deionized water has limited effectiveness; it requires the addition of specialized saponifiers
- Or optimize the soldering process for direct no-clean approach
If you use rosin-based flux:
- Requires solvent cleaning or ultrasonic assistance
Learn about Compare different cleaning methods
Cleaning Effectiveness Verification
Venture Electronics not only provides cleaning services but, more importantly, verifies cleaning effectiveness:
- Ionic contamination testing (ROSE testing)
- Surface insulation resistance testing
- Visual and microscopic inspection
This ensures that cleaned boards truly meet your application requirements.
Learn about cleaning verification methods
Quality Certifications
- IPC-A-610 Class 2/3 process standards
- IATF 16949 (Automotive Electronics)
- ISO 13485 (Medical Devices)
- Complete quality management system
Application Sectors
Venture Electronics serves industries including:
- Industrial control systems (PLCs, DCS, VFDs)
- Medical monitoring equipment
- Railway signaling systems
- Power dispatch equipment
- Automotive electronics (engine control, BMS)
Does Your Project Really Need Aqueous Cleaning?
Before searching for suppliers, first determine whether you need aqueous cleaning.
Determine Based on Flux Type
Water-Soluble Flux:
- Aqueous cleaning is the best choice
- Deionized water can effectively dissolve residues
No-Clean Flux:
- Aqueous cleaning has limited effectiveness
- Ultrasonic cleaning is more effective
- Or optimize the process for direct no-clean approach
Rosin-Based Flux:
- Pure aqueous cleaning cannot effectively remove it
- It requires solvent cleaning or aqueous systems equipped with saponifiers
If you use no-clean flux, even if you find a factory offering aqueous cleaning, the results may not be ideal.
Reduce Cleaning Requirements at the Source
More important than choosing a cleaning method is: reducing contamination through quality soldering processes.
Venture Electronics’ nitrogen vacuum reflow soldering process can:
- Significantly reduce flux residue
- Reduce solder spatter and particle contamination
- Allow many projects to use no-clean processes directly
When solder joint void rates drop from the industry-common 12% to <2%, flux activity requirements decrease and residues are correspondingly reduced. Many projects can therefore simplify cleaning processes or even go directly to no-clean, reducing costs and shortening lead times.
This means you may not need additional cleaning processes at all.
How to Find Suppliers Offering Leaded PCBA Cleaning Services
Screen by Industry Certifications
Search for EMS factories with the following certifications:
- IATF 16949 (Automotive Electronics)
- ISO 13485 (Medical Devices)
- AS9100 (Aerospace)
These certifications typically indicate that suppliers maintain leaded process capabilities.
Check Suppliers’ Service Sectors
Focus on EMS factories that clearly indicate they serve the following industries:
- Industrial control
- Medical devices
- Aerospace
- Railway systems
- Power equipment
EMS suppliers in these sectors are more likely to maintain leaded process lines.
Directly Ask About Key Capabilities
When contacting potential suppliers, ask:
- Do you have dedicated leaded production lines?
- What soldering processes do you use?
- How do you verify cleaning effectiveness?
- Can you recommend cleaning methods based on flux type?
If a supplier can only answer “we can provide aqueous cleaning” without asking about your flux type, careful evaluation is needed.
Venture Electronics Can Help You
Regardless of which flux you use, Venture Electronics can provide the right solution:
If you need aqueous cleaning:
- We provide complete aqueous cleaning and verification services
- Compliant with IPC-A-610 Class 3 standards
If you use no-clean flux:
- We’ll evaluate whether cleaning is truly necessary
- Or recommend ultrasonic cleaning
- Or optimize the process through nitrogen vacuum reflow soldering for direct no-clean
If you’re unsure:
- Our engineering team can provide recommendations based on your application requirements
- Complete solutions from soldering processes to cleaning verification
Learn about Venture Electronics’ complete service capabilities
Discuss Your Leaded PCBA Project
Talk with the Venture Electronics Engineering Team
We can help you:
- Evaluate cleaning requirements based on flux type
- Explain how process optimization can reduce cleaning necessity
- Provide complete solutions from soldering to cleaning verification
- Recommend reliability assurance measures based on application environment
Contact Technical Engineering Team
