USP 5 Skin Patch Bracket, 16 Mesh: Skin Patch Bracket, 80mm (3.15), 16 Mesh Sieve. Used in pulp tray applications. Method: USP Method 5 (on a tray) or USP Method 6 (rotating cylinder) is used for transdermal or skin allergy testing. The method used on the paste tray involves placing the skin patch between a glass tray and an inert polytetrafluoroethylene mesh. This is placed at the bottom of the container, with the grid facing upwards and below the mixing shaft. Unlike dissolution tests, transdermal testing is conducted at 32 ° C to reflect the lower temperature of the skin. Other variables, such as height setting, sampling requirements, and dissolution test, are the same.