Abstract: Devices for scrape testing a sample include: a sample holder for holding the sample; a scraping blade assembly system for testing the physical characteristics of the sample that include a blade assembly, a propulsion system for moving the blade assembly relative to the sample holder, and a force sensor for measuring the force that the blade assembly experiences when scraping against the sample. Methods include placing a sample in a scrape testing device that includes a sample holder for holding the sample; a scraping blade assembly system for testing the physical characteristics of the sample that include: a blade assembly, a propulsion system for moving the blade assembly relative to the sample holder, and a force sensor for measuring the force that the blade assembly experiences when scraping against the sample; and operating the testing device and determining at least one force measurement during movement of the blade assembly.

Abstract: An automated laboratory apparatus for dynamically testing the durability of a coating is provided. The apparatus includes an actuator that drives at least one test unit. Each test unit includes a pressure chamber assembly having a main body and a clamping member. The main body includes a monitoring window, an opening, and an inner chamber wall defining a pressure chamber within the main body. The clamping member includes a central opening. The clamping member and main body are adapted to sandwich a substrate including the coating therebetween to close the pressure chamber. A driven member extends through the central opening in the clamping member and is contactable with the substrate. The actuator drives one or both of an oscillating linear and an oscillating rocking motion of the driven member. A method of testing the durability of a tire coated with a self-sealing sealant for leak-proof performance is also provided.