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Author: Subject: Does anyone know if these are borosilicate or not?
draculic acid69
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[*] posted on 11-2-2020 at 03:46
Does anyone know if these are borosilicate or not?


So I'm in need of a beaker and don't want to wait a month for it to arrive and I've been thinking about this one for a while.im not sure if these are Boro or normal tempered glass but once I get the plastic off I'll give it a go.i think there called a tea decanter or something.the type with a plunger strainer thing.anyway if anyone has tried this and there no good please chime in and let me know before I waste the cash.heres the things I'm talking about :the way I figure it if they can have boiling water poured in without cracking there's a chance they can take some heat

download (2).jpeg - 3kB images.jpeg - 6kB

[Edited on 11-2-2020 by draculic acid69]

[Edited on 11-2-2020 by draculic acid69]
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monolithic
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[*] posted on 11-2-2020 at 04:15


I imagine they are borosilicate but I'm not 100% sure. The vegetable oil index of refraction trick should give you a good idea, if you have something that borosilicate to use as a reference. See https://www.exploratorium.edu/snacks/disappearing-glass-rods

[Edited on 2-11-2020 by monolithic]
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wg48temp9
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[*] posted on 11-2-2020 at 05:20


If the item is branded go to the manufactures site. If it is boro they tend to crow about it.

If the right hand one is a Kawachi , google thinks it is then from their site:

"This French coffee press comes with an extra tough heat-resistant borosilicate glass carafe that does not break easily."

See https://kawachigroup.com/products/kawachi-french-press-coffe...

At 890 Indian Rupee its not cheap.




i am wg48 but not on my usual pc hence the temp handle.

Thank goodness for Fleming and the fungi.
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Tsjerk
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[*] posted on 11-2-2020 at 06:35


My gut feeling is that these are borosilicate, poring boiling water on normal silicate would have it crack for sure.
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Amos
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[*] posted on 11-2-2020 at 07:05


The product on the left comes with the description "The Brew Plunger also known as a French Press is made from commercial grade borosilicate glass in a durable polypropylene (PP) frame with a stainless steel filter."
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Sulaiman
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[*] posted on 11-2-2020 at 07:22


I have bought a few used cafetieres from charity shops in UK.
Some of the beakers are toughened soda-lime glass, some are borosilicate.
Even soda-lime glass can handle significant thermal shock if it is thin.
So far I think the score is 3 broken : 1 survivor.
(two of the breakages were due to me and one just commited suicide)




CAUTION : Hobby Chemist, not Professional or even Amateur
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Dr.Bob
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[*] posted on 11-2-2020 at 17:23


How hard is it to buy a beaker? Most people I know pay a lot for coffee pots.
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draculic acid69
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[*] posted on 11-2-2020 at 18:24


A beaker is gunna cost me $15 for the size I want+ a few wks for delivery.iwant something now.these things should be a bit cheaper $5-10.
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draculic acid69
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[*] posted on 11-2-2020 at 19:37


Scored this for $2.says it's borosilicate on the box.its got a handle I might keep on there and there's a as mesh filter I'll use for something else.heres a few pictures:
The product off the shelf,all the seperate parts and the final beaker.will boil some water in it and report back on success or failure.

IMG_20200212_130835.jpg - 582kB IMG_20200212_130937.jpg - 529kB IMG_20200212_132901.jpg - 476kB

[Edited on 12-2-2020 by draculic acid69]
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draculic acid69
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[*] posted on 13-2-2020 at 01:21


S.U.C.K.S.E.S. (success)
we now have off the shelf beakers available to all.if it says borosilicate on the box go for it.if it doesn't try it anyway.I had it half full of water lightly boiling for half an hour on a cheapo hotplate set to 3 (goes up to 5) so it can take the heat.the handle is definitely worth leaving on as well.makes tipping it out and moving it off the hotplate easier.i now beleive all beakers should have handles.
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wg48temp9
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[*] posted on 13-2-2020 at 03:56


If you want to really test your beakers fill one with cold water and put it on a pre-heated hot plate at say 120C. That should sort out the boro from the soda glass.

I have had a soda glass thick bottomed drink glass crack when I opened the dish washer in the middle of its drying cycle and slide out the top rack that had glasses on it.




i am wg48 but not on my usual pc hence the temp handle.

Thank goodness for Fleming and the fungi.
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Tsjerk
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[*] posted on 13-2-2020 at 04:10


I would preheat the beaker on the plate and poor cold water in it.
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wg48temp9
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[*] posted on 13-2-2020 at 09:24


Quote: Originally posted by Tsjerk  
I would preheat the beaker on the plate and poor cold water in it.


Yes I think your right thats a better/tougher test.




i am wg48 but not on my usual pc hence the temp handle.

Thank goodness for Fleming and the fungi.
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SWIM
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[*] posted on 13-2-2020 at 14:13


A hot plate can crack Pyrex too if you're not careful.
They can heat things mighty fast if they're powerful.

I'd put some oil in the beaker and heat to 150C and dip the hot beaker in cold water.




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This sounds like the best idea since putting ortho tricresyl phosphate in Ginger Jake.
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DavidJR
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[*] posted on 13-2-2020 at 14:50


You "Scored this for $2"? Sorry but just buying proper beakers from a lab supplier is way cheaper and you know what you're getting.
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draculic acid69
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[*] posted on 14-2-2020 at 00:41


If that was an option I would have went with that but there aren't any in my city.
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draculic acid69
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[*] posted on 14-2-2020 at 00:44


And where r u going to get a 600ml beaker for less than $2 outside of China?
No lab supply is that cheap
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Tsjerk
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[*] posted on 14-2-2020 at 06:16


Why don't you order some glass from China via ebay?
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[*] posted on 14-2-2020 at 06:21


when I started out I bought almost all my labware from Deschem, not terrible considering its from china
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monolithic
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[*] posted on 14-2-2020 at 06:48


Quote: Originally posted by Ludus  
when I started out I bought almost all my labware from Deschem, not terrible considering its from china


Their glassware, at least their round bottoms and distillation accessories, is actually pretty good for the price. Some imperfections but it's always held up, even under vacuum and 150 C temperatures.
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draculic acid69
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[*] posted on 16-2-2020 at 17:57


Like I stated in the first paragraph: I didn't want to wait a month for it to arrive from china and needed something now.im also low on cash this week and didn't have $16 dollars to spend on more glassware.
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