These PYREX® capillary melting point tubes are made from No. 7740 glass.
| Thomas No. | Description | Length (mm) | Wall Range (mm) | Wall Tolerance (µmm) |
| 1234B16 | Open Ends | 100 | 0.20 | 0.02 |
| 1234B18 | Open Ends | 100 | 0.25 | 0.03 |
| 1234B20 | 1 Open/1 Closed End | 90 | 0.20 | 0.02 |
| 1234B22 | 1 Open/1 Closed End | 90 | 0.25 | 0.03 |
| Thomas No | Mfr No | Description |
|---|---|---|
| 1234B16 | 9530-1 | Tube 100 mm Open Ends |
| 1234B18 | 9530-2 | Tube 100mm USP Open |
| 1234B20 | 9530-3 | Tube 90mm Closed |
| 1234B22 | 9530-4 | Tube 90mm USP Closed |
