A cosmetic emulsifier helps combine and stabilize oil and water phases, allowing creams, lotions and other emulsions to remain uniform.

Texture analysis measures the physical properties of cosmetic products to evaluate firmness, consistency, spreadability, adhesiveness and application behaviour.

A rheometer is a laboratory instrument used to measure how cosmetic formulations flow and deform under controlled shear, stress, and temperature conditions.

Dilatant flow is a shear-thickening behaviour in which a formulation becomes more viscous as the applied shear rate increases.

Pseudoplastic flow describes shear-thinning behaviour, where a cosmetic formulation becomes less viscous as the applied shear rate increases.

Plastic flow describes the behaviour of structured cosmetic materials that require a minimum stress before they begin to flow, making it important for texture and stability.

Viscoelasticity describes the combination of viscous and elastic behaviour in cosmetic materials and strongly influences texture, flow, spreadability and product stability.

Thixotropy is the time-dependent reduction in viscosity of a structured cosmetic formulation under shear, followed by recovery when the applied stress is removed.

Shear stress is the force applied per unit area to a material during deformation and is an important parameter for understanding cosmetic flow and rheological behaviour.

Shear rate describes how quickly a material is being deformed during flow and is an important parameter for understanding viscosity and cosmetic product behaviour.

Yield stress is the minimum applied stress required for a non-Newtonian cosmetic material to begin flowing and is important for texture, stability and application.

Water activity measures the amount of water available for microbial growth and is an important parameter when assessing cosmetic preservation, stability and microbiological risk.

Solubility describes the ability of an ingredient to dissolve in a particular solvent and is an important factor in cosmetic formulation, stability and product appearance.

A preservation system protects cosmetic formulations against microbial contamination and helps maintain product safety, quality and stability throughout its intended shelf life.

Phase separation is the physical breakdown of a cosmetic formulation into distinct phases and is an important stability concern in emulsions and multi-phase products.

Phase inversion is a change in emulsion structure where the dispersed phase becomes continuous, converting an oil-in-water system into water-in-oil or vice versa.

Water solubility describes how readily an ingredient dissolves in water and is an important factor when developing aqueous and water-based cosmetic formulations.

Oil solubility describes how readily an ingredient dissolves in an oil phase and is an important consideration when developing anhydrous and oil-based cosmetic formulations.

Oil-in-oil emulsions are non-aqueous systems in which one oil phase is dispersed as droplets within another immiscible oil phase.

Hydrophobic substances have little affinity for water and are commonly used in oil phases, anhydrous products and water-resistant cosmetic formulations.

Hydrophilic substances have an affinity for water and are widely used in cosmetic formulations as solvents, humectants, emulsifiers and functional ingredients.

HLB is a numerical system used to describe the hydrophilic and lipophilic balance of surfactants and help select suitable emulsifiers for cosmetic formulations.

Emulsion stability is the ability of a cosmetic emulsion to maintain its physical structure without separation, coalescence or significant changes during storage.

A dispersion is a cosmetic system in which insoluble particles are distributed throughout a continuous phase, such as pigments in creams or powders in liquids.

Dispersing agents help distribute insoluble particles, pigments and powders evenly throughout cosmetic formulations and improve suspension stability.

Co-solvents are formulation ingredients used with a primary solvent to improve the solubility, dispersion and delivery of poorly water-soluble cosmetic ingredients.

Co-emulsifiers support primary emulsifiers by improving emulsion stability, texture and consistency in creams, lotions and other cosmetic emulsions.

Buffer systems help maintain a cosmetic formulation within a defined pH range and support the stability, preservation and performance of sensitive ingredients.