Meng MRI, et al. - Researchers sought to determine how commonly used adjuvants (liquid soap, foam hand sanitizer, or ultrasound gel) influence fiberglass cast mechanics. Measurement of material stiffness, yield stress, and ultimate load was done by 3-point bending in studies comparing regularly shaped samples of water-activated, untreated fiberglass tape (Ossur Techform Premium) to water-activated fiberglass tape treated with one of three commonly used adjuvants during lamination. Outcomes revealed no beneficial effect of the application of adjuvants on fiberglass cast material mechanics, while alcohol-based foam sanitizer significantly reduced cast material stiffness, yield stress, and ultimate load. Results from the current study suggest that the use of these agents should largely be discouraged despite the widespread practice of adjuvant application by medical professionals during casting.