Technical Data
180
Determining a Glass Container Thread Finish GPI refers to the Glass Packaging Institute, which is responsible for establishing and issuing uniform voluntary standards regarding the types and finishes produced by American glass manufacturers. When a container finish is designated as 20-400, it means that the diameter across the outside of the threads is approximately 20mm. (See ‘T’ dimension on illustration.) The 400 designates a specific style of thread. Table 4 shows average dimensions for comparison and to aid in sizing. The actual dimensions may vary slightly, but should be close enough for proper determination of thread finish. Other Variables to Consider 1. Container size and physical design. Narrow mouth vs. wide mouth, tall vs. short, etc. 2. Color. Is light sensitivity an issue? Is amber glass needed? 3. Shelf life. How long are you planning to store a sample or product in the container? 4. Method of fabrication. Molded or tubing based? 5. Processes the container will undergo. Storage conditions (freezing or heat); washing, sterilization; method of sealing; humidity; hot or cold filling; de-pyrogenation.
6. Storage after filling. Time (shelf life needed); heat, cold, moisture; shipping conditions; light exposure. 7. Product composition. Dry powder; pH; concentration of ions; physico-chemical properties. 8. Closure type. Wide mouth vs. narrow mouth; septa lined open top closure; closed closure; liner material; sealing needed; threaded closure orcrimp seal. Opening Dimension of Glass Containers with Thread Finish
The minimum opening dimension ‘I’ of a glass container can be found if the containers thread finish is known. If the thread size of the container is 38-400, the ‘I’ can be determined from Table 4 by looking down the ‘T’ Dimension column (far left) until you find the number 38. Follow this row to the right, until you come to the ‘I’ min. column that is listed under the number 400. This number is the minimum opening of the container. The opening can be larger, but it should not be smaller.
Table 4. Glass Thread Finish Dimensions (Dimensions are in millimeters) ‘T’ 400 410 415
425
430
Dim (mm)
‘H’
‘I’ min
‘H’
‘I’ min
‘H’
‘I’ min
‘H’
‘I’ min
‘H’
‘I’ min
8
— — — —
— — — —
— — — —
— — — —
— —
— —
6.53 6.86 7.49 7.49
2.90 3.76 5.54 6.55
— — — —
— — — —
10 13 15 18 20 22 24 28 30 33 35 38 40 43 45 48 51 53 58 60 63 66 70 75 77 83 89
11.23 13.89 15.42 18.59 21.01 24.05 27.23
5.54 6.55 8.26
9.04 9.04 9.04 9.78 9.78 9.86 9.86 9.86 9.86 9.86 9.86 9.86 9.86 9.98 9.98 9.98 9.98 9.98 9.98 9.98 9.98
8.26
13.03 13.82 14.61 16.15 17.73
8.26
— — — — — — — — — — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — — — — — — — — — —
15.34 15.34 15.34 16.43 18.39 19.30 19.69
6.86 7.92
10.26 12.27 13.11 16.26 16.59 20.09 22.23 25.07 27.71 29.59 31.78 35.08 37.57 40.08 44.07 47.07 50.09 53.09 57.07 61.57 64.67 69.93 74.12 84.94 94.92
10.26 12.27 13.11 16.26
10.26 12.27 13.11 16.26
10.41 11.68 13.34 14.43 17.86
— — — — — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — — — — —
—
—
24.03
21.03
— — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — —
11.99 11.99 13.21 14.78 14.78 17.02
100 110 120
104.93
Glass Joint Specifications
Symbol used to indicate interchangeable joint, stoppers and stopcocks that comply with the requirements of ASTM E676 (taken from commercial standard CS21). Symbol used to indicate a spherical joint that complies with the requirements of ASTM E677 (taken from commercial standard CS21-58). J S T S
T S
J S
J S
24/40 Inner Joint
24/40 Outer Joint
35/25 Ball Joint
35/25 Socket Joint
S
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