Wow, who'd a thunk???
pat
On Fri, Feb 21, 2014 at 2:44 PM, Steve Gregory wrote:
> Hi Pat!
>
> I sent an email to Avago support inquiring about the cleaning
> recommendations in the datasheet and got this reply:
>
>
> We received your inquiry about the assembly process for the VMMK-2203.
> You asked:
> While reading the datasheet for the VMMK-2203, in the section that
> speaks about SMT attachment, there is two notes regarding cleaning;
> "7. Clean off flux per vendor’s recommendations.", and
> "8. Clean the module with Acetone. Rinse with alcohol. Allow the
> module to dry before testing." My question is, is it necessary to
> clean with acetone and rinse with alcohol? One other question is
> regarding solder paste, do I have to use halogen free solder paste?
>
> Yes, we do recommend cleaning with Acetone and rinsing with alcohol.
>
> Let us know if you have further questions.
>
>
> I told you that this was going to be fun…(not!)
>
> Steve
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Patrick Goodyear
> Sent: Friday, February 21, 2014 7:03 AM
> To: [log in to unmask]
> Subject: Re: [TN] Acetone as a cleaning agent for PCBA's
>
> IMHO Acetone is a bad idea to much risk in damaging the board mask and
> substrate. Acetone is used as a solvent for fiberglass resins. I
> have stated before we use 200 proof dehydrated, un denatured alcohol.
> Use in a well ventilated room. Runs about $750 a gal but lasts a long
> time. That included the federal booze tax and Cal. state taxes.
> Mildly denatured leaves a residue but will clean, we use that for
> stainless steel cleaning. I learned about 200 proof in uncle sams
> yacht and canoe club, that was all we were allowed to use. Had to
> get it from the doc in minute quantity's. .pat
> On Thu, Feb 20, 2014 at 9:06 AM, Douglas Pauls wrote:
>
>> Bob,
>> Too many unknowns to give you a good answer. 1. Why is acetone used
>> to wipe down the boards? Bad idea in general.
>> 2. What is meant by "boards appeared dirty"? What visual effect is
>> being noted? And is this at the bare board level or after some
>> processing>
>>
>> Doug Pauls
>>
>>
>>
>> From: Robert DeQuattro <[log in to unmask]>
>> To: <[log in to unmask]>
>> Date: 02/20/2014 11:01 AM
>> Subject: [TN] Acetone as a cleaning agent for PCBA's
>> Sent by: TechNet <[log in to unmask]>
>>
>>
>>
>> I have a customer that uses acetone to wipe down their PCBA's upon
>> receipt.
>> The assemblies we make for them are cleaned using a closed loop
>> aqueous board washer then sampled for cleanliness with our zero-ion
>> tester per J-std-001E guidelines.
>> Recently this customer commented that boards appeared dirty upon
>> cleaning with the acetone. Does anyone have any thoughts on this
>> acetone cleaning process.
>> Thanks,
>>
>> Bob
>>
>>
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