Also known as Borax, sodium borate is a builder that has been used for decades in a wide variety of household products, such as lotions, bath and skin products. We use it to make a product formula clean better by affecting the molecules in the formula so they work together better. Sodium borate can also be used as a pH adjuster that alters the pH of a product to improve stability over time. Every formula has an optimum pH to make it work best. Also, the pH of a formula can affect how long it lasts within a container – for example limiting its tendency to corrode a can, container or dispenser.