Propylparaben is a propyl ester of p-hydroxybenzoic acid. It is a preservative typically found in many water-based cosmetics, such as creams and lotions and some bath products. A preservative derived from PABA that is widely used in cosmetics. Its fungicidal and antibacterial abilities help prevent yeast and mold. Nontoxic and nonirritating at .05 of 1 percent.
Protected Element Transducers are used for rough, irregular or hot surface. There are three different types of protective faces such as protected membrane, protected wear cap and high temperature delay line. Protected membrane is designed to improve coupling with the rough-surface test materials. Protected wear cap prevents the transducers from being damaged by the rough-surface test materials.