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Cleaning For Electronics

Cleaning For Electronics. Wash away the worries of contaminants. Why Clean?. Possible Applications and Contaminants. Customer – military – telecoms – safety critical. Circuit diagram photo plotted onto bare copper board/etched. Conventional ( through hole) Flux. Coated board.

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Cleaning For Electronics

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  1. Cleaning For Electronics Wash away the worries of contaminants

  2. Why Clean? • Possible Applications and Contaminants

  3. Customer – military – telecoms – safety critical Circuit diagram photo plotted onto bare copper board/etched Conventional (through hole) Flux Coated board Coating/ Potting protection SOLDER WAVE Bare board (dirty after 16 processes) Finished (dirty board) CLEANING REFLOW Surface mount (IR, Vapour etc) Customer (“no clean” process) Customer CLEANING CLEANING OF OVENS OR TRANSPORT CHAINS CLEANING of stencils/glue applications For “failed board” REWORK – cleaning of flux/adhesive/coatings PRINTED CIRCUIT BOARD PRODUCTION Components Populated board Cleaned board Solder paste/adhesive (Stencilling)

  4. WHAT CLEANING MAY BE REQUIRED? • FLUX RESIDUES • - Assembled PCB’s • - Ceramics • - Carrier Frames / Jigs + Reflow or Wave equipment • SOLDER PASTE • - Stencils / Dispenser Needles • - PCB’S (Misprints / Rework) • UNCURED SMT ADHESIVE • - Stencils / Dispenser Needles • - PCB’S (Misprints / Rework) • OTHER PROCESS CONTAMINANTS • - PCB board Preparation (HASL etc) • - Handling / storage

  5. CLEANING OF FLUX RESIDUES • OBJECTIVE • - No visual residues • - Ionic contamination <1.5 µg/ cm2NaClequivalent • - High insulation resistivity ( SIR testing IPC TM 650) • Ideally achieved with minimum cost!

  6. A LITTLE CHEMISTRY! • METAL OXIDE + FLUX = CLEAN METAL + WATER + SALTS • Flux wets the metal surfaces and a simple acid/base reaction cleans the surface • Clean metal surfaces can then bond • i.e. soldering can take place • Some residues such as salts, un-reacted fluxes/activators are corrosive and conductive and so must be removed

  7. “NO CLEAN” PROCESSES • LOW / ZERO RESIDUE IONIC PASTES / FLUXES • WORK EXTREMELY WELL, INCLUDING WHEN CONFORMALLY COATED, SO LONG AS… • - Process is optimized • - No residues from earlier stage of board preparation, often >12 processes + handling - • Fingerprints etc • Oils / Greases (HASL) • Particulates (Solder balls, fibre glass, metal oxides, other contaminants) • CLEANING IS STILL REQUIRED FOR OTHER ASSEMBLY PROCESSES • - Solder Pastes / Adhesives • - Stencils / Dispenser Needles • - PCB’S (Misprints / Rework)

  8. “LEAD-FREE” PROCESSES • TRADITIONAL LEAD/TIN/SILVER ALLOYS HAVE BEEN REPLACED • WITH “NO LEAD” SYSTEMS - TIN/COPPER/SILVER ALLOYS • CHANGE WAS REQUIRED DUE TO RoHS WHICH WAS IMPLEMENTED IN JUNE 2006 • CLEANING OF “LEAD FREE” FLUX RESIDUES IS ESSENTIAL BUT DIFFICULT • - Increased temperature means that the residues are “baked on” and are much • harder to remove than traditional leaded flux residues

  9. Aqueous-Based Cleaning • The Safewash Product Range

  10. SAFEWASHSWA, SWAJ, SWAS • Non-flammable • All supplied at ready to use concentration • SWAJ suitable for use on sensitive metals such as copper and aluminium • SWAS good for no-clean fluxes, is easier to rinse and has very low odour • All foam – unsuitable for high pressure spray • All will absorb 5-15% of their weight in fluxes and maintain cleaning power

  11. SAFEWASHSWAF, SWAP, SWAC • Non flammable • Low foaming • SWAF and SWAC supplied as concentrate – dilute to 5-25% in deionised water • SWAP ready to use • SWAP suitable for use on sensitive metals • Can be used in ultrasonic, dishwasher, spray in-line cleaning or pressure washing.

  12. Excellent cleaning performance Removal of all types of flux residues from PCBs and general degreasing applications Supplied as a concentrate: reduced transportation and packaging. Very low toxicity Effective over long periods of time by filtering. Low foam cleaner, suitable for use in: dishwasher in-line pressure systems Ultrasonic spray under immersion SAFEWASH TOTALSWAT

  13. SAFEWASH SWAX • Non flammable. • Removes pastes and adhesives. • Ready to use (44% active). • Low foam – suitable for use in ultrasonic or spray machines for stencil cleaning. • Solder paste uptake of up to 50% without affecting cleaning performance. • pH drops from 10.3 to 6 at this loading BUT is no indication of adhesive content. • Shake before use – clouds at 23-24°C.

  14. SAFEWASH neutral pH flux residues and solder pastes stencil adhesives mechanical parts (degreasing) low foam ultrasonic SWAX SWA SWAF or SWAC SWNS or SWNP super + corrosion inhibitor + corrosion inhibitor SWMN or SWMP SWAJ SWAS SWAP SWAT

  15. Water based Non-flammable Designed for cleaning reflow ovens and wave solder machines Excellent cleaning performance Removes of all types of flux residues and general dirt/grease Supplied ready to use in 500ml spray bottle Very low toxicity REFLOW OVEN CLEANER ROC

  16. A customer trial of ROC………… ROC

  17. Before cleaning……….

  18. Applying ROC……….

  19. Cleaning…………

  20. Left: Before cleaning Right: After cleaning with ROC

  21. Solvent-Based Cleaning • The Electrolube Product Range

  22. ULTRASOLVE ULS • Flammable: Not suitable for use on live • equipment • Fast dry-time • Best choice to remove ionic residue; • also suitable for removing grease and flux residue • Compatible with most plastics; not suitable on • polycarbonate

  23. FLUXCLENE FLU • Flammable: Cannot be used on live equipment • Fast-drying • Best for cleaning flux residue, but can be used • for ionic residue and heavy grease • Safe on most plastics; not suitable on • polycarbonate or polystyrene • Also available – HFFR: Hexane-Free Flux Remover

  24. SCREEN AND STENCIL SOLVENT SSW, SSS • Non-flammable • One of the slowest evaporation rates of all the • solvent based cleaners • Best for cleaning solder pastes and adhesives • Also suitable for flux residue, ionic residue and • heavy grease • Not suitable for use on ABS, polycarbonate or • polystyrene • Also available as SSW: 100 wipe tub dispenser • ULC is also suitable for this application

  25. ECSP Electronic cleaning solvent Plus IPA Isopropyl alcohol ULC Ultraclens MDS Metal Degreasing Solvent DGC Degreaser ULS Ultrasolve Heavy Grease CCC Contact Cleaner Ionic Residue Flammable Non-flammable General Electronic Contacts FLU Fluxclene Flammable LFFR Lead Free Flux Remover PCB Cleaning START Flux Residue Residue Type Substrate FRC Flux Remover Non-flammable Magnetic Tape Heads Printers Glass Solder Paste SSS & SSW Screen and Stencil Solvent PRS Printasolve VID Magnetic Head Cleaner GLC Glass cleaner

  26. Thank you for listening Please visit www.electrolube.com for more information

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