187 Technical Data
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 8 shows average dimensions for comparison and to aid in sizing. The actual dimensions may vary slightly.
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 8 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 8. 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 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
— —
— —
— —
— —
11.48 14.15 15.67 18.85 21.26 24.31 27.48
5.54 6.55 8.25
7.87 7.87
5.54 6.55
9.42 9.42 9.42
8.25
13.28 14.07 14.86 16.41 17.98
8.25
— — — — — — — — — — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — — — — — — — — — —
10.26 12.27 13.11 15.59 16.59 20.09 22.22 25.07 27.71 29.59 31.77 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 15.59
10.26 12.27 13.11 15.59
10.16 10.16 10.24 10.24 10.24 10.24 10.24 10.24 10.24 10.24 10.36 10.36 10.36 10.36 10.36 10.36 10.36 10.36 12.37 12.37 13.59 15.16 15.16 17.40
— — — — — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — — — — —
100 110 120
104.93
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