SAE J1400_202310

This SAE Standard presents a test procedure for determining the airborne sound insulation performance of materials and composite layers of materials commonly found in mobility, industrial, and commercial products under conditions of representative size and sound incidence so as to allow better correlation with in-use sound insulator performance. The frequency range of interest is typically 100 to 10000 Hz 1/3-octave band center frequencies. This test method is designed for testing flat samples with uniform cross section, although in some applications the methodology can be extended to evaluate formed parts, pass-throughs, or other assemblies to determine their acoustical properties. For non-flat parts or assemblies where transmitted sound varies strongly across the test sample surface, a more appropriate methodology would be ASTM E90 (with a reverberant receiving chamber) or ASTM E2249 (intensity method with an anechoic or hemi-anechoic receiving chamber). The SAE J1400 technical report has transitioned from being an SAE Recommended Practice and is now classified as an SAE Standard. This updated version expands the measurement frequency range from 8000 to 10000 Hz and extends the control sample sound transmission loss values in Table 3 to 10000 Hz. Furthermore, the tolerance levels for pressure transducers measuring ambient conditions, as outlined in 3.6, have been tightened. Additionally, the legend in Figure C1 has been modified, and 4.3 has been paraphrased to enhance readability.