Deodorant Firmness Testing: Comparing 24-Hour and 72-Hour Formulations

Why Measure Deodorant Firmness?

Deodorant sticks must deliver consistent performance while remaining easy and comfortable to apply. Their firmness influences how the product feels during use, how easily it glides across the skin and how well it maintains its shape during storage and transport.

Manufacturers may develop different formulations to provide 24-hour or 72-hour protection. Comparing their mechanical properties helps product developers understand differences in texture, consistency and structural strength. Firmness testing provides an objective way to assess these characteristics and support product development and quality control.

Measuring Firmness with Penetration Testing

A texture analyser can measure the firmness of solid and semi-solid products, including deodorant sticks, using a penetration test. This method uses a cylindrical probe to penetrate the product under controlled conditions.

During the test, the instrument records the force required for the probe to penetrate the deodorant to a specified depth. A higher force generally indicates a firmer product, while a lower force suggests a softer consistency.

By controlling the test parameters, such as penetration depth, probe speed and temperature, manufacturers can compare samples under repeatable conditions. This approach helps identify differences between formulations and assess consistency across production batches.

Comparing 24-Hour and 72-Hour Deodorants

Testing two deodorant formulations side by side allows manufacturers to evaluate their relative firmness and identify variations in texture. The results can help product development teams assess whether formulation changes affect the stick’s mechanical properties and application characteristics.

Manufacturers can also use firmness measurements to monitor product stability, investigate formulation issues and establish quality control limits. However, firmness alone does not demonstrate the duration of deodorant protection; separate performance testing must establish the claimed protection period.

Reliable Texture Analysis with Lamy Rheology

Lamy Rheology texture analysers provide a practical solution for measuring the mechanical properties of personal care products. By using controlled penetration tests, manufacturers can obtain objective, repeatable measurements to support formulation development and product quality assessment.

Discover the range of Lamy Rheology texture analysers to find a suitable solution for your testing requirements.