Borosilicate Watch glasses

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bigmack
Posts: 381
Joined: 15 Dec 2015, 10:49
Job Title: Lab Assistant
State/Location: NSW

Borosilicate Watch glasses

Post by bigmack » 25 Nov 2019, 13:10

Does anyone know where to get these ?
I just got quoted $285 +GST for a pack of 10 8O

Edit: sorry 125mm

Ines
Posts: 15
Joined: 23 Mar 2012, 13:56
State/Location: NSW

Re: Borosilicate Watch glasses

Post by Ines » 26 Nov 2019, 11:30

Hi bigmack,
Try Modern Teaching Aids
https://www.teaching.com.au/search?acti ... atch+glass
Very reasonably priced, I am thinking of getting ammeters from there too.
Ines

bigmack
Posts: 381
Joined: 15 Dec 2015, 10:49
Job Title: Lab Assistant
State/Location: NSW

Re: Borosilicate Watch glasses

Post by bigmack » 26 Nov 2019, 11:46

Thanks Ines
They seem to be Soda glass .Seems that's what all our regular suppliers have .
I was looking for Pyrex ( Borosilicate ) ones as we have been having a lot crack when they do a prac where they are on a beaker of water heated with a Bunsen with Ice cubes in them .

HT has now decided that its going to be cheaper to loose a few to cracking than spend over $30 each for Pyrex ones.
Another teacher has just mentioned that she never cracks them because she tells the kids to put a bit of water in the watch glass with the Ice cubes .

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