This document specifies the requirements for acrylic hard type materials used as chairside denture base relining materials and the test methods to determine compliance with these requirements. It also specifies requirements for packaging and marking the products and for the instructions for use to be supplied by the manufacturer. Dentures which are relined by chairside denture base relining materials specified by this document are limited to those of acrylic. This document is not applicable to either denture base relining materials that are for laboratory use or soft lining materials. NOTE 1 Acrylic hard type materials contain acrylic and methacrylic monomers such as acrylic acid esters and substituted (meth)acrylic acid esters and their polymers. NOTE 2 Acrylic dentures are made of polymers such as poly (acrylic acid esters), poly (substituted acrylic acid esters) and rubber-modified poly (methacrylic acid esters).