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Solder paste in Syringe vs Jar

Yngwie

#22276

Solder paste in Syringe vs Jar | 5 November, 2002

What is the advantage an disadvantage of using the Syringe vs Jar, for Solder paste supply media.

Anybody with an input will be much appreciated.

TQ

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Jon Fox

#22277

Solder paste in Syringe vs Jar | 5 November, 2002

Typically the more you buy (by volume) the cheaper it is per gram.

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RDR

#22285

Solder paste in Syringe vs Jar | 6 November, 2002

Syringes seem to keep the paste fresher longer since there is less exposure to air than a jar. It is also nice to be able to just squeeze the trigger on a gun instead of using a spatula in my opinion.

Russ

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#22286

Solder paste in Syringe vs Jar | 6 November, 2002

In order from best, better, good * Lowest purchase price: cartridge, jar, syringe * Ease of inventory control: cartridge, jar, syringe * Flexibility of use: jar, syringe, cartridge * Ability to dispense by hand or machine: syringe * Cost to get paste from container to point of use: jar, cartridge, syringe * Lowest cost to solder coarse pitch: syringe * Highest cost to solder fine pitch: syringe

And we haven�t even considered cassette printing.

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RDR

#22291

Solder paste in Syringe vs Jar | 6 November, 2002

On this I was thimking of cartridges and not syringes.

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Yngwie

#22307

Solder paste in Syringe vs Jar | 7 November, 2002

Thanks for the reply guys...It was much appreciated. On syringe or Cartridge - what about the impact of flux migration, there was a talk about, periodically we need to turn the cartridge or syringe upside down to ensure the metal content & flux are at an even stage always...was that right? Why we need to stir the paste in the jar but not in the Syringe ? The only thing diff. here is, both will experience separation, but the one in the jar will have less exposure to environment. Any input. Thanks

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#22310

Solder paste in Syringe vs Jar | 7 November, 2002

If you are experiencing flux migration, try refrigerating your paste when not in use. This causes the flux viscosity to go up.

I have seen flux seperate from the solder is when it is VERY old and out of date.Sometimes warmer ambient temperatures will cause separation as well.(80F or higher) Have you asked your paste supplier what they reccomend ?That sounds quite strange to me.

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#22343

Solder paste in Syringe vs Jar | 8 November, 2002

You should take steps to prevent paste seperation, regardless of the container type.

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#22345

Solder paste in Syringe vs Jar | 8 November, 2002

What I was told is that the stirring is intended to promote some shear thinning, not to redistribute the flux.

The cartridges (and I'm assuming the syringes, too, if you're differentiating between the two) alledgedly introduce some shear thinning just by the nature of the way the material exits the thing.

I've only seen flux separation on really old paste (well past it's exp. date), as has been previously stated.

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#22466

Solder paste in Syringe vs Jar | 21 November, 2002

Hi,

Jar's quality is easier to measure. If you want to know paste viscosity etc. it's easier if you use jar. I have bad experiences about cartridges. I used cartridges for a short time but I change it back to jar because flux separated too easily in cartridges. Of course it depends who is manufacturer of paste.

By the way, don't put paste back to refrigerator when you have take it in use, because it will increase humidity of paste.

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