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The cleaning of PCB assemblies can be performed using either aqueous or solvent based processes. These depend on a range of parameters (safety, chemistry, cleaning process, environment, substrate and soil type) as well as PCB design and reflow temperatures. Types of flux residue vary from process to process and even no-clean fluxes leave a residue. No single chemistry proves the answer for every situation. The aim is to achieve consistently clean PCB surfaces and under-component areas, free for unwanted flux and other residues – for reliability and repeatability. 

Assembly cleaning processes using aqueous cleaning chemistries include 

  • aqueous batch cleaning – spray in air
  • aqueous batch cleaning – immersion
  • aqueous inline cleaning 

Stencil cleaning using dedicated automatic equipment complements other stencil cleaning methods, including under-stencil wiping and manual or semi-auto cleaning to help avoid unwanted residue on stencils that can lead to print problems and defects.  There are 4 main automatic cleaning processes:

  • immersion ultrasonic cleaning, water rinse
  • Immersion ultrasonic cleaning, no rinse
  • Spray-in-air, water rinse
  • Spray in air, no rinse

Fraser Technologies can help ensure compatibility between chemistries, processes and equipment to ensure optimal cleaning results. New challenges are always on the horizon, and our aim is to meet the changing needs of the electronics sector and help deliver cost effective, safety-conscious and eco-friendly solutions.

The aqueous spray-in-air system that puts flexible controls at your fingertips


The Miele IR 6002 aqueous multistage cleaning system features Profitronic programmable controls offering tremendous flexibility for cleaning different component and soil types.

The IR 6002 is suitable for cleaning and drying a wide range of items such as circuit boards, soldering frames, metal templates, metal components, instruments, technical and optical glassware, magazines, boxes, racks etc.

Application: metal components

  • Steel, stainless steel aluminium, copper, brass, diecast zinc, hard alloys

Types of soiling

  • Oil, emulsions, polishes, metal particles, lapping abrasives

Cleaning requirements:

  • Interim or final clean
  • Before assembling or packing
  • Before sticking, lacquering, welding, soldering
  • Before setting
  • Before coating (e.g. TiN and TiC)

Application: electronics

  • Unpopulated, populated or misprinted circuit boards and ceramic substrates
  • Soldering frames, soldering masks and metal templates

Types of soiling:

  • Milling dust, solder paste, flux residues and SMT adhesives

Cleaning requirements:

  • Before populating
  • After soldering
  • After printing
  • Before circuit tests
  • Before lacquering
  • After misprinting.

Application: glass and optical ware

  • Coated and uncoated glass, e.g. moulded glass, safety glass, optical lenses

Types of soiling:

  • Dust, glass dust, fingerprints, particles, lapping abrasives, polish, wax crayon

Cleaning requirements:

  • Interim or final clean
  • Before and after coating

Application: plastics

  • Plastic components, magazines and transport containers

Types of soiling:

  • Separating agent, dust, particles, oil

Cleaning requirements:

  • Interim or final clean
  • Before assembly or packing.

Application: clean rooms

  • Boxes, racks and chip trays

Types of soiling:

  • Dust, particles, photosensitive resist

Cleaning requirements:

  • Particle decontamination
  • Interim or final clean
  • Before assembly or packing
  • In clean rooms (e.g. Class 100).

At a glance advantages of a Miele aqueous spray-in-air system:

  • Use both a fresh-water circulation and a water recovery system
  • Space-saving
  • Fully automatic programmes
  • Reliable technology – made in Germany
  • Individually programmable, password-protected
  • Nationwide on-site servicing available
  • Low operating costs.

miele-easy-serviceEasy-to-service construction

Shorter service times are enabled by maintenance-friendly construction.

Professional cleaning machine IR 6002
Front loader with drop-down door, without baskets
Free-standing with lid
Fresh water system, max. temperature 93°C
Circulation pump [max. throughput. l/min] 600
Freely programmable PROFITRONIC
Electrical safety lock
Peak load cut-out
Serial interface for process documentation
Sensors for automatic mobile unit recognition  Available to order
1x cold water connection, flow pressure 1.5–10 bar (150-1000 kPa)
1x hot water connection, flow pressure 1.5–10 bar (150-1000 kPa)
1x demin. water connection, flow pressure 0.6–10 bar (60-1000 kPa)
1x DN 25 connection for water recovery
3 inlet hoses approx. 1.7 m, 1/2” with 3/4” threaded union
2x DN 22 drain pumps, delivery head height 100 cm
2x DN 22 drain hoses from machine
1x pump for recovery water
Electrical connection  
3 N AC 400 V 50 Hz, connection cable
approx. 1.8 m, 5 x 2.5 mm2
Heater rating [kW] 9.0
Circulation pump [kW] 1.2
Total connected load [kW] 10.2
Fuse rating 3 x 16
Dispenser pumps  
1x DOS 3 dispenser pump for liquid acidic agents ● (bellows pump)
1x DOS 1 dispenser pump for liquid cleaning agents ● (bellows pump)
Optional dispenser pumps  
DOS 2 dispenser pump for liquid acidic agents/rinsing agent
DOS 4 dispenser pump for liquid cleaning agents/disinfecting agents
Water softener  
Large capacity for cold and hot water to 70°C
Steam condenser  
Rear vent
Drying unit / radial fan  
Fan [kW] 0.3
Heater rating [kW] 2.3
Total connected load [kW] 2.6
Air throughput [m3/h] 55
Temperature programmable in 1°C steps [°C] 60-115
Time programmable in 1-minute steps [min.] 1-240
Preliminary filter EU 4, filter rating > 95%, filter life 100 h
Particulate filter, S-Class HEPA filter, EU 13, filter rating 99.992% (according to DIN standard 24184), filter life 500 h
External dimensions H/W/D [mm] 1175/900/700
Internal cabinet dimensions H/W/D [mm] 500/535/500
Internal cabinet capacity [l] 133.8
Weight [kg] 192
Stainless steel (AE)
Test certificates awarded  

Aquatronic P Range


We specify and supply the Aquatronic P range of aqueous ultrasonic multistage cleaning systems. These systems are available in three models – P1, P2 and P3 – with progressively higher levels of automation.

Processes typically comprise stages such as an ultrasonic clean, agitation via spray under immersion, water rinse, de-ionised water rinse and drying.


The Aquatronic P1 is our entry level aqueous multistage ultrasonic cleaning system. Designed for light to medium production volumes.

Advantages of Aquatronic P1 at a glance:

  • Ultrasonic cleaning
  • Powerful spray jets
  • Hot air dryer
  • Extraction
  • PLC controlled.


The Aquatronic P2 is our mid-range aqueous multistage ultrasonic cleaning system. Designed for medium production volumes.


Advantages of Aquatronic P2 at a glance:

  • Upper tank enclosure with automatic door
  • Ultrasonic cleaning
  • Powerful spray jets
  • Hot air dryer
  • Extraction
  • PLC controlled
  • Full colour touch screen HMI
  • Remote access and diagnostics
  • Stylish LED notification.


The Aquatronic P3 is our flagship multi-stage, aqueous cleaning system. Designed for medium to high production volumes.

Advantages of Aquatronic P3 at a glance:

  • Automatic load and unload conveyor beds
  • Fully automated
  • Sealed upper canopy
  • Ultrasonic cleaning
  • Powerful spray jets
  • Hot air dryer
  • Extraction
  • PLC controlled
  • Full colour touch screen HMI
  • Remote access and diagnostics
  • Stylish LED notification system.
Fraser Technologies