This test method is applicable for determining the relative compression and recovery of fibrous insulation padding materials. 1.1 Purpose The purpose of this test method is to establish a means of measuring the ability of fibrous insulation materials to resist compression and recover after being compressed, dry or wet. It should be noted that there are several test methods. These methods have been found necessary for different loading applications, variation in surface density of the padding materials and the requirements of different vehicle manufacturers. The results of these test methods cannot be correlated directly to each other. The material specification should indicate which test is necessary for a particular application.
SAE J1352 originally contained some basic dry and wet sample methods to measure compression and thickness recovery performance of fibrous materials. Since the original version was issued in 1981, other methods have come into use in various organizations. This revision attempts to incorporate additional in-use methods within SAE J1352 without endorsing any specific method. The user should determine which of the methods is best suited for the specific application.