Author Topic: Hotplate/Stirrer  (Read 2779 times)

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CharlieBigpotato

  • Guest
Hotplate/Stirrer
« on: September 17, 2002, 08:58:00 PM »
As we have the "no sources"-policy here,can somebee give me
"general" reccomendations on a hotplat/stirrer?Any special
features to look for?For example,how big would it have to
bee to bee any good,like if one wanted to do the BrightStar
synth?

Rhodium

  • Guest
An IKAMAG® brand hotplate/stirrer is what you ...
« Reply #1 on: September 17, 2002, 09:12:00 PM »
An IKAMAG® brand hotplate/stirrer is what you want.

weedar

  • Guest
Seriously?
« Reply #2 on: September 17, 2002, 09:30:00 PM »
Of course,I had to check out what these were...
Rhodium,can you reccommend anyone of their models?

I like the one with the picture of a cat on it.. ;D
Edit:Ooops,just discovered the animal-pictures weren't
how they were made..Hope somebee finds the page where they
sell those hotplate w/animals though,it was funny.. :)

Weedar

Me fail English?That's unpossible!

Rhodium

  • Guest
Any IKAMAG is good enough for you, what model you ...
« Reply #3 on: September 17, 2002, 10:02:00 PM »
Any IKAMAG is good enough for you, what model you choose is up to your wallet.

pickler

  • Guest
Swim has a 6"x7" hotplate/stirrer that works ...
« Reply #4 on: September 18, 2002, 12:20:00 AM »
Swim has a 6"x7" hotplate/stirrer that works great. No need in getting a thousand dollar hotplate if you can use a one hundred dollar one. Pm me if you need some more details.

I went into the business for the money, and the art grew out of it.-Charlie Chaplin


CharlieBigpotato

  • Guest
Thank you Rhodium!
« Reply #5 on: September 18, 2002, 03:23:00 PM »
That was good advice,I found what I was looking for..

Weedar,I also found that page you found,I think.Very nice
stirrers! ;)

Greets!

scram

  • Guest
Ika is the definately the stirrer with the ...
« Reply #6 on: September 19, 2002, 01:01:00 AM »
Ika is the definately the stirrer with the strongest magnet I've ever seen...Unbelievable. Pay the extra cash to order one of those. I wish I had ripped one off when I had the chance. The only one I've seen that is next to it is the old Cole-Parmer 6x6 stirrers. Don't get Corning. They suck!

algae

  • Guest
digi?
« Reply #7 on: September 20, 2002, 02:45:00 AM »
Would anyone recommend digital readout?  Advantages/disadvantages?

Osmium

  • Guest
Unnecessary. The RCT basic/RET basic work very ...
« Reply #8 on: September 20, 2002, 03:56:00 AM »
Unnecessary.
The RCT basic/RET basic work very well for all your stirring needs.

I'm not fat just horizontally disproportionate.

noj

  • Guest
Corning
« Reply #9 on: September 20, 2002, 06:12:00 AM »
The older Corning hotplates are better than the newer ones they sell. The new ones can't even handle 27.5g Al in MeOH. Which means I have 3 new ones that collect dust and 1 old one that has faithfully served me well for 2 years. The old Corning 351 can handle a 5gal bucket or a MM reduction at 6x scale.

there's a big difference between criticizing your government and criticizing your country

pickler

  • Guest
that's the exact one swim has noj and it does ...
« Reply #10 on: September 20, 2002, 09:19:00 PM »
that's the exact one swim has noj and it does work wonders. Cheap and does the trick.

I went into the business for the money, and the art grew out of it.-Charlie Chaplin


becomezen

  • Guest
call me crazy......
« Reply #11 on: September 27, 2002, 07:30:00 PM »
but why are hotplate/stirrers listed with a temp range of say 60-300°C ...... can this unit not pull a steady 50°C ? Or is it just not verified to be stable outside the listed temp range ?

Slowly , steadily , strongly , becoming zen.

Rhodium

  • Guest
Exactly, not all of them can be turned on at such ...
« Reply #12 on: September 27, 2002, 08:05:00 PM »
Exactly, not all of them can be turned on at such a low energy output. But when do you need to set your hotplate temp to below 60°C?

RoundBottom

  • Guest
also thermolyne 1000
« Reply #13 on: September 27, 2002, 09:00:00 PM »
another combo plate comperable to the older cornings is the thermolyne 1000.  it's major drawback is its height, about twice that of the corning.

Nymphomania is not a disease  - its a goal!  (Methadist on Rosemary Kennedy)

Osmium

  • Guest
> hotplate/stirrers listed with a temp range ...
« Reply #14 on: September 27, 2002, 09:08:00 PM »
> hotplate/stirrers listed with a temp range of say 60-300°C

That is the SURFACE TEMPERATURE of the hot plate! Doesn't mean that you can bring a flask to 300°C!

You can easily set any temp you want, even below 60°C, when you use one of these external switching thermometers and an oil or water bath as a heat sink. I've personally put a 300mm (1 foot) diameter glass crystallising dish with 2 liters of oil and a stir bar in it on top of these stirrers, stuck the temp. probe into the oil, and managed to keep the temp at a steady 40°C. Of course the same can be done with much smaller oil baths, I've done the same with only 100ml oil in an 80mm dish too.
The reason is that the built-in sensor in the heating plate of the stirrer is lagging behind the actual heating taking place by a few seconds due to the mass of the hot plate, so one easily overshoots the desired temperature by a few degrees when no heat sink like a water bath or flask is present. The built-in temp probe and electronics aren't that sensitive either, they can tell the difference between 60°C and 70°C but probably not between 60°C and 62°C.
Just use an oil or water bath in conjunction with a switching thermometer and you can achieve exactly the temperature you want in your oil bath. This of course is only useful when you run reactions at a specific temperature, it's completely irrelevant for distillations!!

I'm not fat just horizontally disproportionate.

nutlin

  • Guest
Corning 351
« Reply #15 on: October 02, 2002, 06:07:00 AM »
I've heard mixed opinions concerning the Corning 351. Someone i talked to said theirs couldnt handle and 27.5g Al in MeOH. But mabe theirs was faulty. Anyone else have any imput on the Corning 351?

handsfull2

  • Guest
yep
« Reply #16 on: October 02, 2002, 06:16:00 AM »
I have a corning 351 combo and it works great .
Paid a dollar for it at a yard sale.......
    8)

  "Go ahead jump  "  


goiterjoe

  • Guest
corning 351
« Reply #17 on: October 03, 2002, 12:47:00 AM »
although not my favorite hotplate/stirrer, I've had one that functioned fine.  the thing would get hot, but the stirrer on it was fairly weak.  On second thought, most reactions I had that involved heavy duty stirring for I would use just a heavy-duty stirrer.

All paths are the same: they lead nowhere

William_Omblome

  • Guest
Heating mantle/stirrer
« Reply #18 on: October 03, 2002, 07:11:00 AM »
I've seen these somewhere but they are really expensive.

wyndowlicker

  • Guest
Hey now!
« Reply #19 on: October 03, 2002, 11:58:00 AM »
Barnstead/Thermolyne

Cimarec stirring hotplate 7X7 Swiw hears they work great! :P

Counting starts by candlelight all are dim ,but one is bright.-GD