November 7, 2023
Rheology drives big tubes more than diameter charts
Butter masks, scrubs with grit, and shear-thinning creams need different orifices and shoulder strength. A 200 ml tube that works for lotion may collapse or fatigue for a dense mask.
Salon back-bar versus retail
Back-bar packs see pumps, wet hands, and refills. Retail packs see shelf facings and theft tags. One diameter can serve both only if cap and label zones are planned for both journeys.
Inverted storage trends
Flip-cap bases that stand cap-down help high-viscosity products dwell near the outlet. Confirm long-term creep on shoulder welds when the formula weights the closure side for weeks.
Takeaway
Share rheology curves early. Large-format hair tubes are solved at the intersection of fluid mechanics and habit, not by picking the biggest diameter on the chart.