Low-Dew-Point Compressed Air Solutions for Semiconductor & PCB Manufacturing

Semiconductor and PCB manufacturing facilities rely on compressed air for automation equipment, pneumatic controls, precision assembly, testing systems, production machinery, handling equipment, and general plant utilities.

Some production areas may require tighter control of moisture, particles, and residual oil than standard general-purpose manufacturing air.

Moisture in untreated compressed air can condense inside pipelines and downstream equipment, while oil aerosols and solid particles may affect pneumatic components, precision equipment, and process consistency.

Lingyu provides regenerative desiccant air dryers, modular adsorption dryers, refrigerated air dryers, and multi-stage compressed air filtration solutions for semiconductor, PCB, and other high-precision electronics manufacturing environments.

Why Air Quality Matters

Compressed air naturally contains water vapor and may also carry oil aerosols and solid particles originating from ambient air, the compressor, piping, and the air treatment system.

As compressed air cools, water vapor can condense inside distribution piping and downstream equipment. In moisture-sensitive production areas, unstable moisture levels may affect pneumatic components and process stability.

Oil aerosols and particulate contamination can also reach production equipment if they are not adequately removed.

For semiconductor and PCB manufacturing, compressed air quality should therefore be selected according to the actual process and point of use.

The key parameters may include:

• Pressure dew point
• Particle level
• Residual oil level
• Operating pressure
• Flow stability
• Point-of-use requirements

General utility air, automation air, testing equipment, precision assembly, and moisture-sensitive process air may require different treatment strategies.

Key Challenges

Moisture-Sensitive Production Areas

Some semiconductor and PCB processes may require compressed air significantly drier than standard refrigerated air.

Where a lower pressure dew point is specified, regenerative desiccant drying can provide deeper moisture removal.

Fine Particle and Oil Control

Dry compressed air is not necessarily clean compressed air.

Oil aerosols and solid particles should also be controlled through appropriately selected filtration according to compressor type and downstream process requirements.

Continuous Production

Semiconductor and electronics facilities may operate for long periods or continuously.

Compressed air treatment equipment should therefore provide stable drying performance, practical maintenance, and reliable long-term operation.

Different Air Quality Requirements

Not all compressed air users within the same facility require the same specification.

General plant air, pneumatic automation, test equipment, precision assembly, and process-sensitive areas should be evaluated separately.

Point-of-Use Treatment

Some applications may benefit from local low-dew-point or higher-level filtration instead of applying the strictest air quality requirement to the entire compressed air network.

Energy Efficiency

Deep adsorption drying requires additional energy and regeneration air.

Low-dew-point treatment should therefore be concentrated where the process actually requires it.

Recommended Solution

For semiconductor and PCB manufacturing areas requiring low-dew-point compressed air, a regenerative desiccant air dryer combined with appropriate multi-stage filtration provides a practical treatment approach.

For smaller capacities or space-limited installations, a modular heatless desiccant air dryer can provide compact local treatment.

For larger continuous-duty systems, blower-heated or other energy-saving regeneration technologies can reduce compressed air consumption during regeneration.

Where the required pressure dew point is less demanding, refrigerated drying may be used for general utility air or as part of a staged treatment system.

The final configuration should be selected according to:

• Required pressure dew point
• Particle requirement
• Residual oil requirement
• Compressed air flow
• Operating pressure
• Inlet temperature
• Production area
• Duty cycle
• Available installation space

Low-Dew-Point Compressed Air

For applications requiring deep moisture removal, the HH Series Heatless Regenerative Desiccant Air Dryer provides a low-dew-point compressed air solution.

The HH Series provides:

• Outlet pressure dew point: ≤−40°C
• Rated inlet pressure: 0.7 MPa
• Operating pressure range: 0.6–1.0 MPa
• Rated inlet temperature: 10–30°C
• Maximum inlet temperature: ≤40°C
• Average regeneration air consumption: 8–14%
• Desiccant: Activated Alumina + High-Performance Molecular Sieve
• Operating ambient temperature: 2–45°C

This configuration can be considered for production areas where the actual process specification requires low and stable pressure dew point compressed air.

The required pressure dew point should be determined by the process rather than applied automatically to the entire plant.

Compact Low-Dew-Point Treatment

For smaller capacities, local production areas, or installations where equipment footprint is limited, the M Series Modular Heatless Desiccant Air Dryer provides a compact adsorption drying option.

This type of system can be considered for:

• Local low-dew-point compressed air
• Precision assembly
• Equipment-side treatment
• Testing equipment
• Smaller process zones
• Space-limited technical installations

Final selection should be based on actual flow rate, operating pressure, inlet conditions, and required pressure dew point.

Multi-Stage Compressed Air Filtration

Drying controls moisture, while filtration helps reduce oil aerosols and solid particles.

Lingyu D Series compressed air filters provide several filtration grades:

Multiple filtration stages can be configured according to compressor type, dryer arrangement, and downstream air-quality requirements.

For adsorption dryer systems, suitable upstream filtration helps protect the desiccant from oil and particulate contamination.

Where very low residual oil levels are required, activated carbon filtration can be considered after appropriate upstream treatment.

Staged Air Treatment

In larger semiconductor and PCB facilities, a staged compressed air treatment strategy can provide a practical balance between air quality and operating efficiency.

A typical general plant arrangement may include:

Air Compressor → Air Receiver → Refrigerated Air Dryer → Multi-Stage Filtration → General Plant Air

For production areas requiring deeper drying:

Pre-Treated Compressed Air → Regenerative Desiccant Air Dryer → Final Filtration → Low-Dew-Point Process Air

This approach removes a large portion of moisture before the adsorption dryer and allows deep drying to be applied only where required.

Energy-Efficient Low-Dew-Point Systems

For larger continuous low-dew-point compressed air systems, regeneration air consumption becomes an important operating consideration.

The HRB-E Series Low-Purge Blower-Heated Regenerative Desiccant Air Dryer provides:

• Outlet pressure dew point: −20°C / −40°C optional
• Regeneration air consumption: 2–3%
• Rated inlet pressure: 0.7 MPa
• Operating pressure range: 0.6–1.0 MPa
• Maximum inlet temperature: ≤40°C
• RS-485 communication as standard

During regeneration, an independent blower supplies heated ambient air to the regeneration tower.

Only a small amount of dry product compressed air is used during cooling, reducing compressed air losses compared with conventional heatless regeneration.

This configuration can be considered for larger semiconductor and PCB facilities with continuous low-dew-point air demand.

Heat-of-Compression Drying

For suitable compressor configurations, a Heat-of-Compression Regenerative Desiccant Air Dryer can also be considered.

This technology uses heat already present in the compressed air system to support desiccant regeneration.

It is most appropriate where compressor type, discharge temperature, operating schedule, and required pressure dew point make heat-of-compression regeneration technically suitable.

Final selection should be based on the complete compressor and air treatment system rather than the dryer alone.

Refrigerated Drying for General Utility Air

Not every compressed air user in a semiconductor or PCB facility requires adsorption drying.

For general utility air, pneumatic equipment, and other applications where a 2–10°C pressure dew point meets the actual requirement, an AH Series Air-Cooled Refrigerated Air Dryer can provide a more economical solution.

The AH Series provides:

• Pressure dew point: 2–10°C
• Rated inlet pressure: 0.7 MPa
• Operating pressure range: 0.6–1.0 MPa
• Maximum inlet temperature: ≤80°C
• Operating ambient temperature: 2–45°C
• Pressure drop: ≤0.025 MPa

Refrigerated drying can also be used as the upstream moisture-removal stage in a staged low-dew-point treatment system.

Typical Selection Guide

The final compressed air treatment system should be based on the actual air-quality requirement of each production area.

Typical Applications

Lingyu compressed air treatment systems can support applications including:

• Semiconductor manufacturing
• PCB manufacturing
• Electronics production
• Precision assembly
• Pneumatic automation
• Testing equipment
• Inspection systems
• Robotic production equipment
• Control valves and actuators
• Precision instruments
• Moisture-sensitive production areas
• General plant utility air
• Central compressed air stations
• Equipment-side compressed air treatment

Where processes have specific requirements for pressure dew point, particles, oil, or other contaminants, the complete system should be selected according to the process specification.