Density Determining of Thermal Barrier Strip of Polyamide Used for Thermal Barrier Profiles of Aluminum Alloy

The density of thermal barrier strips of polyamide used for thermal barrier profiles of aluminum alloy determined by immersion method in GB/T 1033.1-2008 was compared with the results given by method of determining the density for precious metals in GB/T 1423-1996. Theoretical calculation showed that the deviation of density caused not by experimental error, but by improper formula application. Immersion method in GB/T 1033.1-2008 proofed correct only under the limitation in which the effect of wire could be ignored. As normal test conditions fail to satisfy such limitation requirement, method in GB/T 1423-1996 is recommended in consideration of its rationalities and universality.