--- title: "pH and viscosity profiling" description: "Measure your product's pH and viscosity under defined conditions." image: "https://cosmetic-labs.com/wp-content/uploads/ph-viscosity-service-1200x1200-1.webp" --- # pH and viscosity profiling > Measure your product's pH and viscosity under defined conditions. Source: https://cosmetic-labs.com/services/in-vitro-testing/cosmetic-quality-testing/characterization/ph-viscosity Created: 2025-03-13T07:41:33+00:00 Modified: 2026-10-25T11:05:51+00:00 Author: Emilie SCHOL pH and viscosity profiling | Cosmetic Labs ## What is pH and viscosity profiling? Acidity and flow behaviour measured under defined conditions. ### Why do you need this service? pH and viscosity profiling compares acidity and flow behaviour under defined measurement conditions. Use it to investigate a formulation change, set an appropriate specification or track a product during storage. ## Be the first company on this service page No published company profiles are linked to pH and viscosity profiling or its more specific services yet. Explore the service categories or add an explicitly supported capability to your company profile. [List your company](https://cosmetic-labs.com/account/companies/new) Definition ## pH and viscosity profiling These measurements provide complementary information about a cosmetic formula. pH describes the acidity of an appropriate aqueous phase or preparation, while viscosity describes resistance to flow under specified test conditions. Tracking both can reveal changes that a visual check misses. ### pH measurement Calibrated meters and suitable electrodes are used with a documented sample preparation and temperature. Direct measurement, dilution and extraction can give different results, so the procedure must remain consistent. Conventional pH measurement may not be meaningful for an anhydrous product without a defined preparation. Time-point measurements can identify drift relevant to ingredient stability or preservative performance. Target ranges depend on product chemistry, intended use and safety evaluation rather than a universal range for cleansers, serums or moisturizers. ### Viscosity and flow behavior Flow curves across defined shear rates - Yield behavior in structured gels or emulsions - Temperature dependence - Recovery after shear and thixotropic behavior Viscometer or rheometer geometry, speed, equilibration and sample history affect the result. Profiles can guide pump selection, processing and application behavior, and repeated measurements can show thickening or structural loss during storage. They support, but do not replace, sensory evaluation and broader stability testing. Applications ## Using acidity and flow measurements pH measurements need a suitable preparation and method for the product format. A value in an aqueous product is not directly interchangeable with a measurement after dilution, and some non-aqueous products do not have a meaningful undiluted pH. Viscosity depends on temperature, shear conditions and measurement geometry. Record these with the result, particularly when comparing prototypes or batches. Different product formats need different target ranges rather than a universal acceptable viscosity. Profiles can identify a change that needs investigation. They do not alone establish skin compatibility, preservation or shelf life, and a short measurement programme cannot replace evidence collected over the required storage conditions. ExplorationLearn more about Physicochemical TestingCharacterise cosmetic composition, structure and physical behaviour through active content, particle, pH, flow and molecular-property measurements. Explore another Physicochemical Testing page on cosmetic-labs.com. #### [Cosmetic Physicochemical Testing](https://cosmetic-labs.com/services/in-vitro-testing/cosmetic-quality-testing/characterization/physicochemical-analysis) Build an agreed profile of cosmetic product properties through physicochemical testing, with methods and specifications matched to the sample. [Check this service](https://cosmetic-labs.com/services/in-vitro-testing/cosmetic-quality-testing/characterization/physicochemical-analysis) #### [Active ingredient quantification](https://cosmetic-labs.com/services/in-vitro-testing/cosmetic-quality-testing/characterization/active-quantification) Quantify selected active compounds in cosmetic raw materials or finished products using suitable analytical methods and sample-specific controls. [Check this service](https://cosmetic-labs.com/services/in-vitro-testing/cosmetic-quality-testing/characterization/active-quantification) #### [Particle size distribution](https://cosmetic-labs.com/services/in-vitro-testing/cosmetic-quality-testing/characterization/particle-size) Measure particle-size distributions in cosmetic dispersions, powders or pigments to investigate material properties and compare batch consistency. [Check this service](https://cosmetic-labs.com/services/in-vitro-testing/cosmetic-quality-testing/characterization/particle-size) #### [Analytical Microscopy](https://cosmetic-labs.com/services/in-vitro-testing/cosmetic-quality-testing/characterization/microscopic-analysis) Cosmetic emulsion microscopy images oil droplets on glass slides to characterize droplet size and distribution after homogenization. [Check this service](https://cosmetic-labs.com/services/in-vitro-testing/cosmetic-quality-testing/characterization/microscopic-analysis) #### [Spectroscopic Characterisation](https://cosmetic-labs.com/services/in-vitro-testing/cosmetic-quality-testing/characterization/spectroscopic) Investigate cosmetic ingredients and formulations with suitable spectroscopic methods for identification, comparison or selected quantitative measurements. 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