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 Material Testing Capabilities
The effectiveness of an acoustical material is given by its sound transmission loss, sound absorption coefficient, or its damping loss factor. Blachford has facilities for the measurement of all of these material parameters.
- Sound Transmission Loss*
SAE J-1400
Sound Transmission Loss (STL) is a measure of how well a material or an assembly can block sound. Two 4' x 4', and one 8' x 8' test openings are utilized to measure the STL according to SAE J1400. Two of the openings are configured for testing samples in a vertical orientation while one of the 4' x 4' openings is configured for testing samples such as floormats horizontally, just as they would be installed.
- Sound Absorption*
Random Incident Measurements per ASTM C423.
Normal Incident Measurements per ASTM E1050.
Sound Absorption is a measure of how well a material can absorb sound. Large samples are tested in our reverberation room according to ASTM C423 while small samples can be tested in our impedance tube according to ASTM E1050.
- Damping
Oberst Bar
Damping is the ability for a material to reduce the resonant vibration of a material. Damping properties are measured using an Oberst bar according to SAE J1637 or ASTM E756.
*ISO 17025 accreditation planned for 2008 for these two tests.
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