What goes wrong

It separated, or hardened

Updated October 2026

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Separation in a scrub Hardening in a salt scrub Sugar goes the other way Butters grain and go gritty Which makes transit temperature a real factor Headspace and a jar sized to the fill Keep retained samples through a summer Three of the four are normal and need explaining References

Normal behavior, badly packaged and worse explained.

Separation in a scrub

Solids suspended in oil settle, and the oil rises. A customer opening a jar to find a clear layer on top is seeing physics, not spoilage, and a line in the instructions converts a complaint into an expectation.

Hardening in a salt scrub

Salt draws moisture and then sets, so a salt scrub can go from loose to solid in a humid bathroom. A liner that actually seals, and advice to keep the lid on, are the controls.

Sugar goes the other way

It dissolves in the water that reaches it, so a sugar scrub turns syrupy rather than hard. Same cause, opposite symptom, and both are worth naming in the copy.

Butters grain and go gritty

Shea and some other butters crystallize unevenly if they cool slowly or cycle in temperature, and the result feels gritty. That is a cooling process question rather than a container one, but transit heat contributes.

Which makes transit temperature a real factor

A box in a hot vehicle melts and recools a butter, and it arrives grained. Shipping season and packaging insulation are genuine decisions for this category rather than afterthoughts.

Headspace and a jar sized to the fill

Less air and less room for the contents to move means less separation in transit. With 253 containers from 15 to 250 mL the fit is available.

Keep retained samples through a summer

Filled, sealed, stored as stock is stored, and opened at intervals. Graining, separation and hardening are all slow and seasonal, and only a retained sample shows them before a customer does.

Three of the four are normal and need explaining

Separation, hardening and syrupiness are physics rather than spoilage, and a customer reads any of them as a fault unless told. Graining is the one that is actually a process problem.

References

21 CFR 740.1, which requires the label of a cosmetic product to bear a warning statement whenever necessary or appropriate to prevent a health hazard that may be associated with the product. law.cornell.edu

29 CFR 1910.1200, Hazard Communication, which sets what a shipped container of a hazardous chemical carries and requires a safety data sheet. law.cornell.edu

Written from federal statute and from measured catalog data, not from a formulation bench. Whether a particular particle is a plastic microbead within 21 U.S.C. 331(ddd) is a question about that particle and its purpose. Nothing here is a determination about a specific exfoliant or a specific formula.