What goes wrong

The stick bound, or slumped

Updated October 2026

On this page8

Too hard binds Too soft slumps Temperature decides which one you get Fill temperature matters too Which is why the tube has to be the real one Test by using it, over weeks Or choose the jar instead References

The archetype says the mechanism tolerance is the whole spec, and it is right.

Too hard binds

A firm base grips the tube wall and the elevator has to shear it to move. The customer twists harder, the mechanism strips, and the product is unusable with most of it still in the tube.

Too soft slumps

A soft base extrudes past the elevator rather than riding on it, so product gets behind the mechanism and the stick sinks when it warms. Both failures are about fit between your base and that specific tube.

Temperature decides which one you get

A base that behaves in a cool room binds in a cold one and slumps in a hot car. So the test is not a single condition, it is the range the product will actually see.

Fill temperature matters too

A deodorant stick is filled warm and sets in the tube. Pouring too hot can distort a plastic mechanism; pouring too cool gives a poor surface and shrink cavities that show as the stick is used.

Which is why the tube has to be the real one

Mechanisms differ between suppliers in thread pitch, elevator fit and wall stiffness. A formula tuned to one tube is not tuned to another, and there are three deodorant containers in this catalog rather than a family.

Test by using it, over weeks

Filled, set, then twisted up and down repeatedly, left warm, left cold, and left standing. Every failure here is mechanical and appears in use rather than on a bench.

Or choose the jar instead

A cream in a 2 oz jar has no mechanism to fail, and the 13 PP jars on this shelf plus the 253 on the cream shelf are a much wider choice. For a first product that is often the better route.

References

21 CFR 350.50, Labeling of antiperspirant drug products. Paragraph (a) requires the product to be identified as an antiperspirant; (b)(1) gives the Uses statement as a choice of one of three verbs and one of five nouns; (b)(3) and (b)(4) tie duration and "extra effective" claims to 20 percent and 30 percent sweat reduction; (c) sets four verbatim warnings; (d) sets the direction "apply to underarms only". law.cornell.edu

Written from the federal monograph, not from a formulation bench. Whether a given product is a cosmetic or a drug turns on its ingredients and its claims, and that is a determination with consequences; nothing here substitutes for getting it right for a specific formula and label.