Electronics > Beginners
Plunger, needle tip & cap for flux & solder paste syringe - where / which to buy
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Ian.M:
Unless things have changed a lot in the last decade or so, I think you'll find that captive plungers are often  not compatible between different brands of syringe as the plunger to piston seal interface isn't well standardised.   The plungerless syringes intended for use with automatic dispensing and compact syringe driver systems will have fairly good standardisation of the plunger/piston interface because compatibility is an obvious requirement, but your wun-hun-lo syringe of vaseline's plunger is quite likely not to fit the plungerless syringe from Amtech or other reputable source's piston well enough.  That leads to the plunger coming loose when the syringe is part used, usually when you pull back on it to stop drool, then when you attempt to re-engage it with the piston, there's a fair chance the piston will capsize, at which point you have a FUBARED mess that you can either trash, or attempt to remove the capsized piston with forceps so you can scrape the product out with a spatula and transfer it to a jar.

 |O  Been there, done that and got the (stains on my) teeshirt!  :popcorn:

Nanofrog's suggestion of cutting the mushroom end off to make it non-captive may work well enough if you are careful and lucky and if you've got a 3D printer that suggestion  looks like its worth a try , but decanting into a smaller syringe isn't really that much hassle and with any common sense is nearly mess free.   The Luer lock coupler holds the two syringes nozzle to nozzle and the dowel in the block of wood sits on your bench so you can easily push the pistonless syringe down on it with one hand till the small syringe is 2/3 full, while your other hand eases back the small syringe plunger. Take it off the dowel and pull a slight vacuum with the small syringe, before disconnecting the coupler, plungerless side first and you'll get minimal mess with only the coupler to clean unless you are decanting ridiculously runny flux   

Unless its *very* runny I don't like filling syringes from the back as its very difficult to avoid air bubbles and even a small bubble results in poor control and a tendency to drool when you stop pushing.
nanofrog:

--- Quote from: Rooster Cogburn on April 29, 2018, 01:42:57 pm ---I had absolutely no luck finding any plungers even though I spend quite a while searching on BG, AliExpress, eBay.
--- End quote ---
I found one on eBay for $4.99, but shipping to Germany was just shy of $16.  :palm:

I also searched using the term piston, and didn't have any luck that way either. So you may end up having to buy an entire 30ml syringe to get the part you need.  :-\


--- Quote from: Rooster Cogburn on April 29, 2018, 01:42:57 pm ---...[re Manual Syringe Gun]...Mostly attractive because then I wouldn't need a plunger ;-)
--- End quote ---
I'll eventually break down and buy one of these someday.  >:D


--- Quote from: Rooster Cogburn on April 29, 2018, 01:42:57 pm ---There's a ton of options regarding needles. Good idea buying a kit so I can try out all sizes!

--- End quote ---
Best way to find what works best for you IMHO.  :)
nanofrog:

--- Quote from: Ian.M on April 29, 2018, 01:45:57 pm ---Nanofrog's suggestion of cutting the mushroom end off to make it non-captive may work well enough if you are careful...[snip]

Unless its *very* runny I don't like filling syringes from the back as its very difficult to avoid air bubbles and even a small bubble results in poor control and a tendency to drool when you stop pushing.

--- End quote ---
FWIW, the cone/mushroom end isn't compatible with the piston seals used for dispensing products IME, so something flat works much better. A razor knife with a fresh blade should do nicely.

I also like the idea of filling smaller syringes, but I'm with you on the air bubbles issue from filling them from the back end. Fortunately there is a Female Luer Lock to Female Luer Lock adapter/coupler, so that should solve the problem. :) BTW, I checked and this seller does ship to Germany if you're interested. :-+

Stainless:


Disposable type:


I'll be buying one of the stainless couplers I linked.  ;D
Skashkash:
I've not had too much trouble with air bubbles from filling from rear filling small syringes, but the amounts i'm using are small.

I've been using one of this style re-usable plungers for years. It came in a paste sample kit from an old job, and has been pretty universal.  I could certainly use a few more in different sizes. 

http://www.adhesivedispensers.co.uk/handplungers.htm 

I wish I could find a cheap source of them.   
nanofrog:
I'd seen those before, but I couldn't recall the terminology. So thanks.  :-+

I found a 3pk. of the 30ml size on Grainger, and they they want $133.00 for it (here).  :o The 10ml come in a 2pk. that goes for ~$73. Their sister site, Zoro, is better on pricing, but still not what I'd call reasonable ($86.99, here). The 10ml 2pk. goes for $51.95.  |O

Buy once, cry once I guess, but the syringe gun is looking even better at those prices ^.  >:D
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