Round Bottom and Erlenmeyer Flasks

Round Bottom Flasks

Below are listed the nominal volumes and respective diameters for standard borosilicate spherical "round bottom" flasks. We receive them as blanks without finished necks, as shown in the photo on the right, and add to them as required. For example the image below 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. 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.

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

RB Blanks (/images/uploads/3442.jpg)
Volume, ml Diam, mm Diam, in
5 25 1
10 31 1.2
15 35 1.4
20 38 1.5
25 42 1.7
50 48 1.9
100 60 2.4
125 65 2.6
200 76 3
250 83 3.3
300 87 3.4
500 82 4
Volume, ml Diam, mm Diam, in
1000 130 5.1
2000 161 6.3
3000 185 7.3
5000 221 8.7
6000 236 9.3
10000 279 11
12000 295 11.6
20000 345 13.6
22000 350 13.8
50000 457 18
72000 520 20.5
100000 610 24
1L 4 neck flask (/images/uploads/2012.jpg)

Erlenmeyer Flasks

These are the dimensions of standard Erlenmeyer flask blanks. The heights will vary with style; some blanks have unfinished tops.

 Nominal volume, ml Base Diam, mm

Height, mm

 

25 ml 41 61  
50 ml 51 78  
125 ml 67 114  
250 ml 82 132  
500 ml 101 176  
1000 ml 129 216  
2000 ml 160 268  
4000 ml 206 360  
Erlenmeyer Flask Blanks (/images/uploads/2389.jpg)

For an example, 500ml round bottom blanks proved to be a great starting place to make these porrons, shown at right and prepared from 500ml blank flasks. A decaled fill line is fired on to indicate a proper serving for use at a local restaurant.

Modifying standard blank flask forms is routine.

500ml Porron (/images/uploads/2526.jpg)