Technical Data, Caps & Closures

The closure industry has not standardized on dimensions to the extent that the container industry has, and it is usually advantageous to buy both container and closure from the same supplier when possible. Similar to the container industry, when a closure fi nish is designated as 33-400, it means that the nominal diameter measured across the inside of the cap at the opening is approximately 33mm. (See “T” dimension on illustration.) The 400 designates a specific style of thread. The thread fi nish of the cap and container must be the same. A container with a 33-400 thread finish should be used with a cap that has a 33-400 thread finish.  To determine the cap size, measure the cap opening from one side of the inner wall to the opposite side of the inner wall. Compare this number to the numbers found in the “T” dimension columns in Table 2a or 2b. Once this number is found in the table, follow the row to the far left to find the “Nominal Diameter” of the cap.

To determine the specifi c style of thread, measure the depth of the cap from the liner surface to the outside edge of the cap. Compare this number to the numbers found in the “H” dimension columns in Table 2a or 2b that appear in the same row as the Nominal Diameter of the cap.  Once this number is found in the table, follow the column to the top to find the specifi c style number (400 in the above example). The dimensions in the tables are approximate and will probably be slightly different from what is measured (especially the “H” dimension due to variations in liner thickness), but should be close enough to allow for the proper determination of the cap size.
 

Suggested Torque for Screw Caps
The integrity of the cap-to-container seal is dependent upon a numberof variables, such as the materials of the cap, liner, and container, thesealing surface of the container, and the application torque applied to the closure. The most important f these is the application torque. If the cap is applied too loosely, the contents could leak (especially during shipping).  If the cap is applied too tightly, it may be too diffi cult to remove the cap, or the container could break during application.

Table 1 offers some suggested torques that should provide an adequate seal for most applications. It is recommended that proper tests be performed to determine the optimum torque for the application. The most practical way to check the tightness is to measure the removal torque after the cap has been on the container for about 5 minutes. The removal torque should closely approximate the application torque. The minimum removal torque noted in the table should be maintained after a 24 hour period. 

Table 1. Suggested Torques for Closures (in-lb) 

  Phenolic/Urea Cap
on Glass Container
Phenolic/Urea Cap
on Plastic Container
PP/PE Cap
on Glass Container
PP/PE Cap
on Plastic Container
Cap
mm
Application
Torque
Min Removal
Torque
Application
Torque
Min Removal
Torque
Application
Torque
Min Removal
Torque
Application
Torque
Min Removal
Torque
15 8 4 6 3 12 7 8 4
18 9 5 7 4 13 8 9 5
20 10 5 8 4 15 9 10 5
22 11 6 9 5 17 10 11 5
24 12 6 10 5 18 11 12 6
28 14 7 12 6 21 12 14 7
33 18 9 15 7 24 14 17 8
38 20 10 17 7 29 17 19 9
43 22 11 18 9 33 20 22 11
48 24 12 20 10 36 22 24 12
58 28 14 24 12 44 26 29 14
70 35 18 28 14 52 32 35 17
89 45 22 36 18 65 40 45 22
100 50 25 40 20 75 38 50 25


Table 2a. Cap Thread Finish Dimensions (Dimensions are in inches)

  400 410 415 425 430
Nominal
Dia (mm)
T H T H T H T H T H
8 -- -- -- -- -- -- 0.360 0.245 -- --
10 -- -- -- -- -- -- 0.415 0.255 -- --
13 -- -- -- -- 0.520 0.430 0.520 0.280 -- --
15 -- -- -- -- 0.585 0.535 0.585 0.280 -- --
18 0.790 0.360 0.710 0.500 0.710 0.595 -- -- 0.710 0.605
20 0.790 0.360 0.790 0.530 0.790 0.720 -- -- 0.790 0.605
22 0.870 0.360 0.870 0.560 0.870 0.815 -- -- 0.870 0.605
24 0.945 0.390 0.945 0.620 0.945 0.935 -- -- 0.945 0.650
28 1.095 0.390 1.095 0.685 1.095 1.060 -- -- 1.095 0.725
30 1.130 0.390 -- -- -- -- -- -- 1.130 0.760
33 1.270 0.390 -- -- -- -- -- -- 1.270 0.775
35 1.370 0.390 -- -- -- -- -- -- -- --
38 1.480 0.390 -- -- -- -- -- -- 1.480 0.940
40 1.590 0.390 -- -- -- -- -- -- -- --
43 1.660 0.390 -- -- -- -- -- -- -- --
45 1.750 0.390 -- -- -- -- -- -- -- --
48 1.850 0.390 -- -- -- -- -- -- -- --
51 1.975 0.390 -- -- -- -- -- -- -- --
53 2.075 0.390 -- -- -- -- -- -- -- --
58 2.230 0.390 -- -- -- -- -- -- -- --
60 2.235 0.390 -- -- -- -- -- -- -- --
63 2.470 0.390 -- -- -- -- -- -- -- --
66 2.585 0.390 -- -- -- -- -- -- -- --
70 2.745 0.390 -- -- -- -- -- -- -- --
75 2.920 0.390 -- -- -- -- -- -- -- --
77 3.040 0.470 -- -- -- -- -- -- -- --
83 3.275 0.470 -- -- -- -- -- -- -- --
89 3.520 0.515 -- -- -- -- -- -- -- --
100 3.945 0.580 -- -- -- -- -- -- -- --
110 4.340 0.580 -- -- -- -- -- -- -- --
120 4.735 0.675 -- -- -- -- -- -- -- --



Table 2b. Cap Thread Finish Dimensions (Dimensions are in millimeters)

  400 410 415 425 430
Nominal
Dia (mm)
T H T H T H T H T H
8 -- -- -- -- -- -- 9.14 6.22 -- --
10 -- -- -- -- -- -- 10.54 6.48 -- --
13 -- -- -- -- 13.21 10.92 13.21 7.11 -- --
15 -- -- -- -- 14.86 13.59 14.86 7.11 -- --
18 18.03 9.14 18.03 12.70 18.03 15.11 -- -- 18.03 15.37
20 20.07 9.14 20.07 13.46 20.07 18.29 -- -- 20.07 15.37
22 22.10 9.14 22.10 14.22 22.10 020.70 -- -- 22.10 15.37
24 24.00 9.91 24.00 15.75 24.00 23.75 -- -- 24.00 16.51
28 27.81 9.91 27.81 17.40 27.81 26.92 -- -- 27.81 18.42
30 28.70 9.91 -- -- -- -- -- -- 28.70 19.30
33 32.26 9.91 -- -- -- -- -- -- 32.26 19.69
35 34.80 9.91 -- -- -- -- -- -- -- --
38 37.59 9.91 -- -- -- -- -- -- 37.59 23.88
40 40.39 9.91 -- -- -- -- -- -- -- --
43 42.16 9.91 -- -- -- -- -- -- -- --
45 44.45 9.91 -- -- -- -- -- -- -- --
48 47.63 9.91 -- -- -- -- -- -- -- --
51 50.16 9.91 -- -- -- -- -- -- -- --
53 52.71 9.91 -- -- -- -- -- -- -- --
58 56.64 9.91 -- -- -- -- -- -- -- --
60 59.69 9.91 -- -- -- -- -- -- -- --
63 62.74 9.91 -- -- -- -- -- -- -- --
66 65.53 9.91 -- -- -- -- -- -- -- --
70 69.72 9.91 -- -- -- -- -- -- -- --
75 74.17 9.91 -- -- -- -- -- -- -- --
77 77.22 11.94 -- -- -- -- -- -- -- --
83 83.19 11.94 -- -- -- -- -- -- -- --
89 89.41 13.08 -- -- -- -- -- -- -- --
100 100.20 14.73 -- -- -- -- -- -- -- --
110 110.23 14.73 -- -- -- -- -- -- -- --
120 120.27 17.14 -- -- -- -- -- -- -- --


Material Description Applications
Poly-Vinyl One mil poly vinyl fi lm bonded to one mil HDPE on a #30
white pulp paper backing. Superior to plain pulp paper
because it provides excellent moisture barrier.
General purpose: Suitable for wide range of applications. Chemical resistance: Good for mild acids, alkalis, solvents, alcohols, oils and aqueous products; poor for active hydrocarbons and bleaches.
Poly-Seal® Manufactured from LDPE. The unique cone design
provides a wedge type seal that not only seals across the
top but also across the inside diameter.
Unique problem solving type of liner. This liner is stress crack resistant and offers superior torque retention and excellent sealing characteristics. It is recommended that this liner be tested prior to use for leak seal.
Foamed Polyethylene A one piece, three ply coextruded liner consisting of
foamed and solid LDPE. The foam core is sandwiched
with solid clear PE.
General Purpose: Broad applications base. Chemical resistance-good for acids, alkalis, solvents, alcohols, oils, household cosmetics and aqueous products. Poor for hydrocarbon solvents. Liner provides tight seal.
Pulp/Metal Foil Aluminum foil bonded to pulp board. Good barrier properties, good resistance to hydrocarbons, oils, ketones and alcohols. Not good for acids or alkalis.
Styrene-Butadiene
Rubber (14B)
The white rubber lining material consists of homogeneous
sulfur cured styrene-butadiene rubber (SBR). FDA
Status complies with 21CFR 177.26, “Rubber articles
intended for repeated use.”
Excellent properties of resilience, resistant to moisture vapor. Satisfactory for most moderate chemicals. Not good for oils, strong acids and hydrocarbons. Autoclavable.
Styrene-Butadiene
Rubber/0.005 PTFE
The white rubber/0.005” PTFE liner consists of virgin
PTFE bonded to the white sulfur cured, styrene-butadiene
rubber. Complies with the FDA 21CFR 177.1550.
Designed for the ultimate in product safety. PTFE provides totally inert inner seal and surface facing the sample or product. Autoclavable.
PTFE Faced Silicone
Rubber
The white rubber/0.005” PTFE liner consists of virgin
PTFE bonded to the white sulfur cured, styrene-butadiene
rubber. Complies with the FDA 21CFR 177.1550.
Designed for the ultimate in product safety. PTFE provides totally inert inner seal and surface facing the sample or product. Autoclavable.
PTFE Faced
Foamed Polyethylene
The liner consists of 0.005” thick PTFE bonded to
0.055” thick silicone rubber.
Ideal for low temperature storage applications. PTFE facing provides excellent chemical barrier. Autoclavable

Note: Closures and liners are designed for a variety of applications. Product performance can vary depending on conditions. It is recommended that proper tests be performed to determine the best liner for the application.

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