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Plastic flasks, class A, 25 or 50 mL, NS 19/26
Posted: Sat Aug 09, 2014 7:21 pm
by LCFan
Hello,
who knows a supplier of volumetric flasks in class A.
Volume: 25 or 50 mL
19/26 stopper (!), bigger tablets should be placed in the flask
Material: plastic
Thank you very much for your help.
Florian
Re: Plastic flasks, class A, 25 or 50 mL, NS 19/26
Posted: Sun Aug 10, 2014 11:19 pm
by Consumer Products Guy
Largest neck class A that I've seen for those sizes takes 13 stopper, and are glass.
Larger neck decreases accuracy.
Re: Plastic flasks, class A, 25 or 50 mL, NS 19/26
Posted: Mon Aug 11, 2014 2:19 am
by DR
Corning makes glass wide necked flasks w/ screw caps. They work well for larger tablets.
Re: Plastic flasks, class A, 25 or 50 mL, NS 19/26
Posted: Fri Aug 15, 2014 4:04 pm
by James_Ball
Do they even make Class A plastic volumetric ware? The only thing I have seen are Class B in plastic.
Re: Plastic flasks, class A, 25 or 50 mL, NS 19/26
Posted: Sat Aug 16, 2014 10:15 am
by Hollow
agree with CPG
don't think there are any volumetric flask with such a combination of volume and neck size (if not custom made).
I doubt that you will reach the necessary precision for a type A specification with that neck size for 25 or 50ml.
have a look at the Brand specification table (glas):
10/19 ±0.04 ml
12/21 ±0.06 ml
14/23 ±0.10 ml
19/26 ±0.25 ml -> which is about 0.5-1% error for your volumes; which is even larger than type B spec.
Why don't you dissolve/disperge your tablets in small volume in a beaker and the quant. transfer it to the vol-flask?