Hydroxypropyl Methylcellulose

Hydroxypropyl methylcellulose (abbreviated HPMC) thickens aqueous formulations and gives them a smooth gel consistency. In a formulation it acts as a thickener and consistency stabiliser : it holds the gel in shape, slows down dripping and helps keep the other ingredients evenly dispersed. It works without neutralisation , so viscosity does not depend on pH adjustment with a base as with carbomers. Suitable for thickening tonics, facial gels or aqueous carriers for active ingredients, where the formulation should remain light yet hold its shape. Key properties Thickening without neutralisation – viscosity develops through dissolution in water alone; no pH adjustment or additional activating ingredient is required. High efficiency – a 2 % aqueous solution reaches a viscosity of 10 000 – 20 000 mPa·s , so a low usage level is sufficient for noticeable thickening. Stability across a common pH range – the recommended formulation pH range is 5.0 – 8.0 , covering most facial care recipes. Not classified under CLP – the substance is not classified as hazardous under the CLP Regulation. Use in formulation Hydroxypropyl methylcellulose belongs in the aqueous phase . The recommended usage level is 0.5 – 3 % depending on the desired consistency. The lower end is sufficient for slightly thickening a tonic or spray; the upper end gives a thick gel that holds its shape in a jar. When dissolving, the most important thing is to prevent lumps from forming. The powder must not be poured all at once into standing water. The proven approach is to sprinkle it slowly into water while stirring co