Soap Bars - Cleansing & Moisturizing
Initial Stiffness, firmness
There are a variety of personal cleaning bar products on the market. Some are called “soap” whereas others are labeled as “cleansing” or “moisturizing” bars. The firmness of cleansing bars affects consumer judgments as to the ‘feel’ of the product, the payout per use and the products’ longevity in the soap dish. The target firmness of each bar is a function of its ingredients and manufacturing conditions. Breakage during manufacturing, distribution and shelf life may also be related to how firm or stiff the products are. This study illustrates how to measure the initial stiffness and firmness of cleansing and moisturizing bars for R&D and QC/QA departments which need a method for designing and manufacturing their own products.