Closures and liners
Updated
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What the counts are
169 closures sit against these necks. By liner: 67 HIS, 28 pressure-sensitive, 14 PE foam, 14 with no liner, 11 foam, 10 F217 and a handful of others. By kind: 127 continuous thread, 15 flip top, 11 spouted, 7 buttress.
The HIS set covers the necks that matter
Those 67 induction-seal closures span 38-400 at 17, 45-400 at 13, 24-410 at 12, 33-400 at 7, 28-400 and 28-410 at 6 each, 38-430 at 5 and a 120TT. So the inner-seal route is available across the whole shelf, not just at one size.
HIS is a membrane, F217 and foam are gaskets
A foam or F217 liner compresses against the land and seals while the cap is on. An induction liner bonds to the land and stays sealed with the cap removed. For an inner-seal requirement, only the second shape answers.
Pressure-sensitive liners are a third thing
They stick to a clean land on first application without heat, which makes them convenient and makes their performance dependent on surface condition and on application pressure. Ask what the supplier has tested.
Buttress threads at the jug end
7 buttress closures, which are the coarse threads used on larger containers. They are not interchangeable with continuous thread, so the jug and its cap are chosen together rather than separately.
Chemical compatibility is still yours to check
Methanol, glycol ethers and hydrocarbon carriers each treat liner materials differently, and the rule for brake fluid asks for a seal impervious to the packaged fluid. That is a question about your fluid, asked in writing.
Standardize on one neck across the range
One finish means one closure, one liner and one induction setting. With 38-400 the largest group at 22 containers and 17 HIS options behind it, that is the obvious place to standardize.