PCB Cleaning
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From: jadu on 19 Jan 2010 10:35 jadu had written this in response to http://www.electrondepot.com/electrodesign/Re-PCB-Cleaning-450232-.htm : John Larkin wrote: ------------------------------------- Nice article If you are interested you can visit the www.leelaelectronics.in and browse many ultrasonic cleaners. Not just ultra sonic PCB cleaners but you will find many types of ultrasonic cleaners like table top cleaners , larger ultrasonic & other applications ##-----------------------------------------------## Delivered via http://www.electrondepot.com/ Electronics Enthusiasts' Community of the Net Web and RSS access to your favorite newsgroup - sci.electronics.design - 368644 messages and counting! ##-----------------------------------------------##
From: JosephKK on 19 Jan 2010 22:38 On Sat, 16 Jan 2010 12:39:05 -0800 (PST), mickgeyver <eyezkubed(a)yahoo.com> wrote: >On Jan 16, 11:24 am, John Larkin ><jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote: >> On Sat, 16 Jan 2010 07:12:35 -0600, "mook johnson" <m...(a)mook.net> >> wrote: >> >> >> >> >> >> >"Bob Eld" <nsmontas...(a)yahoo.com> wrote in message >> >news:hipunq$h3h$1(a)news.eternal-september.org... >> >> >> "Jon Slaughter" <Jon_Slaugh...(a)Hotmail.com> wrote in message >> >>news:hipkai$h07$1(a)news.eternal-september.org... >> >>> Is it safe to soak a pcb in acetone for several minutes to clean it up >> >>> all >> >>> the flux? The board only has some QFN's, SMT LED's, and passive SMT's. I >> >>> imagine the acetone won't harm these packages? >> >> >> I think acetone, MEK and similar solvents are too harsh. They can dissolve >> >> or swell some plastics and may damage components. >> >> >> I use 91% isopropyl alcohol or denatured ethanol both are mild and work >> >> well. Use a small brush to loosen flux then wipe with a soft clean cloth. >> >> Re-do if any residue remains. >> >> >+1 on the alcohol recommendation. use an acid brush with the bristles cut >> >down to 1/2" long. squirt the alcohol inside the hollow brush handle and it >> >will wick down the bristles while you are scrubbing. >> >> IPA tends to leave white residue when used to clean rosin flux. >> >> >Once the heavy buildup is loose, put paper towel between the board and the >> >brush and repeat allowing the papertowel to absorb the liquified flus and >> >alcohol mix. >> >> For really clean boards, the last step should be a squirt rinse with >> clean solvent. >> >> John > >IPA dissolves the rosin. The white stuff left over is not soluble in >IPA >but is soluble in water. I always follow IPA cleaning with a good >scrubbing >w/toothbrush and warm water then blow dry. Baking in warm oven is >optional. >al Ah, so that is why some people have told be to use (distilled / deionized) water for the last rinse.
From: Archimedes' Lever on 20 Jan 2010 01:34 On Tue, 19 Jan 2010 19:38:24 -0800, "JosephKK"<quiettechblue(a)yahoo.com> wrote: >On Sat, 16 Jan 2010 12:39:05 -0800 (PST), mickgeyver <eyezkubed(a)yahoo.com> wrote: > >>On Jan 16, 11:24�am, John Larkin >><jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote: >>> On Sat, 16 Jan 2010 07:12:35 -0600, "mook johnson" <m...(a)mook.net> >>> wrote: >>> >>> >>> >>> >>> >>> >"Bob Eld" <nsmontas...(a)yahoo.com> wrote in message >>> >news:hipunq$h3h$1(a)news.eternal-september.org... >>> >>> >> "Jon Slaughter" <Jon_Slaugh...(a)Hotmail.com> wrote in message >>> >>news:hipkai$h07$1(a)news.eternal-september.org... >>> >>> Is it safe to soak a pcb in acetone for several minutes to clean it up >>> >>> all >>> >>> the flux? The board only has some QFN's, SMT LED's, and passive SMT's. I >>> >>> imagine the acetone won't harm these packages? >>> >>> >> I think acetone, MEK and similar solvents are too harsh. They can dissolve >>> >> or swell some plastics and may damage components. >>> >>> >> I use 91% isopropyl alcohol or denatured ethanol both are mild and work >>> >> well. Use a small brush to loosen flux then wipe with a soft clean cloth. >>> >> Re-do if any residue remains. >>> >>> >+1 on the alcohol recommendation. �use an acid brush with the bristles cut >>> >down to 1/2" long. �squirt the alcohol inside the hollow brush handle and it >>> >will wick down the bristles while you are scrubbing. >>> >>> IPA tends to leave white residue when used to clean rosin flux. >>> >>> >Once the heavy buildup is loose, put paper towel between the board and the >>> >brush and repeat allowing the papertowel to absorb the liquified flus and >>> >alcohol mix. >>> >>> For really clean boards, the last step should be a squirt rinse with >>> clean solvent. >>> >>> John >> >>IPA dissolves the rosin. The white stuff left over is not soluble in >>IPA >>but is soluble in water. I always follow IPA cleaning with a good >>scrubbing >>w/toothbrush and warm water then blow dry. Baking in warm oven is >>optional. >>al > >Ah, so that is why some people have told be to use (distilled / deionized) >water for the last rinse. If the final IPA rinse is with clean enough IPA and nothing is left on the board, there will be nothing to form any halo with.
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