MineMan - 7-3-2018 at 21:39
Hello All,
I remember sites like banggood had some really good prices a few months ago... it seems like the availability of chems and labware have sharply gone
up in price and down in availability in the last two months.
Banggood is not much cheaper than ebay, gearbest has nothing and I though they use to. Google sucks these days and only shows sponsored sites.
What are some good places? I am here in the US. I would like to get a small vacuum filtration kit with a pump
LearnedAmateur - 8-3-2018 at 04:34
If you don’t mind a hand operated pump then this might be an option, if you’ll be doing filtering regularly then it’ll be well worth the money:
https://www.amazon.com/gp/aw/d/B00UDIYO38/ref=mp_s_a_1_2?ie=...
Büchner funnels from China are cheap and the one I have is excellent quality, set me back approximately $10 and has a 60mL capacity, perfect for the
scales I work with. You’ll need an adapter too if your glassware isn’t 23mm, and these are also cheap, I got one from China and it hasn’t failed
me. Alternately, I use a filter paper folded into a glass funnel, placed into a thermometer socket with a vacuum adapter and that works quite well.
To be fair, it may be a better option to source equipment separately as opposed to buying kits, especially if you’ve already got flasks. Like I
said, Chinese glass works fine as long as you’re not subjecting it to tough conditions, I usually filter at room temperature and occasionally up to
around 80C. Definitely source a pump locally though, being more complex and likely to break, but I do recommend spending out for the sake of
reliability and longevitiy.
Edit: just adding some of my finds, copy over the item numbers to the US store.
https://m.ebay.co.uk/itm/100ml-Filter-Funnel-Buchner-24-40-J...
https://m.ebay.co.uk/itm/29-32-Female-to-14-23-Male-Joint-La...
https://m.ebay.co.uk/itm/100ml-24-40-Joint-90mm-Glass-Powder...
https://www.aliexpress.com/item/32837133126/32837133126.html
[Edited on 8-3-2018 by LearnedAmateur]
Dr.Bob - 8-3-2018 at 08:15
I can supply Buchner funnels, glass frits, filter flasks, and related stuff in the US for reasonable prices. No pumps (but I might have a water
aspirator left, however). Just u2u me with what size you want or look at the spreadsheet of glassware in the thread on glassware looking for a home.
Bert - 8-3-2018 at 08:23
If Dr. Bob doesn't have it, Nanshin glass in China has had good stuff in my recent experience, and they package glass very well for the trip. Takes
about 2 to 3 weeks to arrive.
[Edited on 8-3-2018 by Bert]
MineMan - 8-3-2018 at 16:08
This is very helpful all!!
subsecret - 8-3-2018 at 17:36
If you have a sink, an aspirator is a great hands-free vacuum source.
https://www.ebay.com/itm/Stainless-Steel-Aspirator-Pump-Humb...
BkAAOSw5cNYcGtH
chloric1 - 6-8-2024 at 09:12
I love using the Butchner funnel to suction filter solids dry. Some salts, especially more covalent transition metal salts, are soluble in methanol,
ethanol or acetone. My question deals with using 99% isopropyl alcohol to pull water off solids. It’s inexpensive and does not dissolve inorganics
well.