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FUNDAMENTALS OF PLASTICS AND CLOSURES
COMPARISON OF COMMON PLASTICS USED IN PACKAGING
NECK FINISH AND CAPS
If you see "24/410" in the neck finish specifications, remember that:
1. the upper number 24 means that the outer diameter of the bottle or "T" has a measurement of 24mm
2. the lower number 410 means that the bottle's neck has 1.5 thread turns.
A container and its corresponding closure must have matching finishes. For example, a 24/410 bottle will only accept a 24/410 closure.