Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Shelf Life Control

#5181

Shelf Life Control | 7 February, 2001

We are reviewing our shelf life policy and have the following items listed as shelf life sensitive: Printed circuit boards, peelable solder mask, solder paste, moisture sensitive parts, multiwire printed circuit boards from Icon or Hitachi, NiCd batteries, electrolytic capacitors.

Do you know of a more extensive listing? [We know that the US DOD / EPA/ etc have a self life program, but can not glean useful information from all the flotsam and jetsam.] Are there other items that you shelf life control that are not on this list?

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K

#5182

Shelf Life Control | 8 February, 2001

-Surface mount adhesives (any other adhesives)

-Roll solders

-Fluxes

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#5185

Shelf Life Control | 8 February, 2001

K: Do you shelf life control rolled solder because of the flux core?

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K

#5188

Shelf Life Control | 8 February, 2001

Nope -- we don't shelf life control roll solder here. Just threw that on the list as a possible.

I don't think it would be necessary.

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#5189

Shelf Life Control | 8 February, 2001

Any adhesive tape, or stuff that uses it in packaging, like radial and axial parts. Ever try to get 5 year old 1/2 watt resistors to hold still in an axial sequencer dispense head? Yeesh.

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BLNorman

#5191

Shelf Life Control | 8 February, 2001

Potting compounds and conformal coatings.

Any 1 or 2 component liquid thermoset material.

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Lee Kibler

#5219

Shelf Life Control | 13 February, 2001

We maintain shelf life on all of our RTV silicon compounds.

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#5224

Shelf Life Control | 13 February, 2001

We got dinged in a ISO 9000 audit for not having shelf life on locktite threadlock at my previous employer.

Larry

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#5235

Shelf Life Control | 14 February, 2001

From Kester's web site:

"Flux cored solder wire has a limited shelf life determined by the alloy used in the wire. For alloys containing more than 70% lead, the shelf life is two years from date of manufacture.

Other alloys have a shelf life of three years from date of manufacture."

Of course you've probably already found this out from your vendor....

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