Round Bottom Flasks

Below are listed the nominal volumes and respective diameters for standard borosilicate spherical "round bottom" flasks. For volumes less than 25ml, we must prepare them from tubing; these small volumes are not available as stock items and are shown in the chart below just for reference. 

We receive them as blanks without finished necks, as shown in the photo below, and add to them as required. For example the image on the right shows a 1L blank prepared as a 4-neck flask with a 45/50 female tapered joint, and three 24/40 female tapered joints.

There are small variations in these blanks depending on the manufacturer. Some are specified as "heavy wall", with larger outside diameters.

Designing your glassware around standard sizes will make a difference in your cost.

Vol, ml Diam, mm Diam, in.   Vol, ml Diam, mm Diam, in.
5 25 1   1000 130 5.1
10 31 1.2   2000 161 6.3
15 35 1.4   3000 185 7.3
20 38 1.5   5000 221 8.7
25 42 1.7   6000 236 9.3
50 48 1.9   10000 279 11
100 60 2.4   12000 295 11.6
125 65 2.6   20000 345 13.6
200 76 3   22000 350 13.8
250 83 3.3   50000 457 18
300 87 3.4   72000 520 20.5
500 102 4   100000 610 24

 

RB Blanks (/images/uploads/3442.jpg)

 

1L 4 neck flask

 

Shown below are  Porrons prepared from 500ml blank round bottom flasks. A decaled fill line is fired on to indicate a proper serving for use at a local restaurant.

 

 

500ml Porron