awlb2 - 3-12-2016 at 07:50
I have recently acquired some glassware (burette, volumetric flask and conical flask) from a brand I was not previously aware of, and I would like to
find out the name of the brand if possible- all I know is that the manufacturer's logo is a cogwheel shape and is produced in either China or India.
The glassware is of quite poor quality but sufficient for my needs. Does anyone happen to know the brand name- out of interest?
Thanks in advance.
Dwarvensilver - 3-12-2016 at 09:27
Have you a pic of the logo, I have not run across it but can't really google it till you know what it looks like 
Texium - 3-12-2016 at 10:29
I'm almost certain I've seen that brand before, but I'd need to see a picture to confirm if I have and maybe jog my memory.
Pictures...
awlb2 - 3-12-2016 at 13:18
My apologies for taking so long to reply and upload these images:
"Volumetric" flask with unknown branding and a new unit for volume "mlln"! 
The first flask in question was very poorly calibrated(line volume around 280ml!), but luckily I found this wonderful old Czech volumetric flask
in an antique shop (at a very low price), which is much higher quality!
[Edited on 3-12-2016 by awlb2]
aga - 3-12-2016 at 15:54
Whatever glass one buys, it must Always be evaluated for the Quality.
Some things you can just heat up and see if it survives.
Volumetric flasks Certainly need to be tested to see if the Mark is correct.
On the Other hand, if you can Measure the Error, it's just the same as a calibration certificate : add/subtract the error and you got what you
originally wanted.
NeonPulse - 9-12-2016 at 21:09
Unsure of the top flask brand but I can tell you the Czech brand is Simax. I have some of their glass and it is of good quality.
awlb2 - 12-12-2016 at 10:42
Thanks for replying NeonPulse.
Do you perhaps know when the volumetric flask is from ?
It looks a lot older than most SIMAX glassware I have seen and does not have the Simax branding
PeterC - 12-12-2016 at 11:04
The second flask was made by Kavalier Glass in Czechoslovakia which has been producing SIMAX glassware since 1958 so it is entirely possible what you
have is not made of SIMAX 3.3 Boro glass but rather a different glass like Boro 4.8 (SIAL) or K35 borosilicate glass.
awlb2 - 13-12-2016 at 13:07
Thank you everyone, the history of glassware is rather complex and interesting!
It is interesting to think that the volumetric flask was likely to have been produced in a communist nation, but then again the cheap flask from China
is technically made in a 'Socialist' state.
What does the number after Boro even refer to, the percentage of boron trioxide or boron ?
PeterC - 13-12-2016 at 13:43
The number next to the boro should be equal thermal expansion (at least according to my research) due to the number next to the boro aligning with the
"Coefficient of mean linear thermal expansion α (20 °C; 300 °C) acc. to DIN ISO 7991" on the glasses datasheet.