WHEATON Technical Data - page 18

WHEATON
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Technical Data, Plastic
Opening Dimension of Plastic Containers
with Thread Finish
The minimum opening dimension ‘I’ of a plastic
container can be found if the container’s thread
finish is known. If the thread size of the container is
38-400, the ‘I’ can be determined from Table 11 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.
Biological Properties of Plastics
Plastic products and containers are considered to be biologically inert. For example
polyethylenes, fluoropolymers, polypropylene, polystyrene and polycarbonate are
considered to be non-toxic to cell cultures. Distilled water for preparing culture media
can be collected and stored in polyethylene containers.
Determining a Plastic Container Thread Finish
When a container finish is designated as 24-410, it means that the diameter across
the outside of the threads is approximately 24mm. (See ‘T’ dimension on illustration.)
The 410 designates a specific style of thread. Table 11 shows average dimensions for
comparison and to aid in sizing. The actual dimensions may vary slightly.
Table 11. Plastic Thread Finish Dimensions
(Dimensions are in millimeters)
‘T’
400
410
415
425
Dim (mm)
‘H’
‘I’ min
‘H’
‘I’ min ‘H’ ‘I’ min ‘H’ ‘I’ min
13
11.48
5.54
7.87
5.54
15
14.15
6.55
7.87
6.55
18
9.42
8.25
13.28
8.25
15.67
8.25
20
9.42
10.26
14.07
10.26
18.85
10.26
22
9.42
12.27
14.86
12.27
21.26
12.27
24
10.16
13.11
16.41
13.11
24.31
13.11
28
10.16
15.59
17.98
15.59
27.48
15.59
30
10.24
16.59
33
10.24
20.09
35
10.24
22.22
38
10.24
25.07
40
10.24
27.71
43
10.24
29.59
45
10.24
31.77
48
10.24
35.08
51
10.36
37.57
53
10.36
40.08
58
10.36
44.07
60
10.36
47.07
63
10.36
50.09
66
10.36
53.09
70
10.36
57.07
75
10.36
61.57
77
12.37
64.67
83
12.37
69.93
89
13.59
74.12
100
15.16
84.94
110
15.16
94.92
120
17.40
104.93
1...,8,9,10,11,12,13,14,15,16,17 19,20,21,22,23,24,25,26,27
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