The effectiveness of a sound barrier cannot be assessed by design or materials alone—it must be verified with internationally recognized test results. Acoustic Laboratory Thailand Co., Ltd. (ALT) offers expert sound barrier testing in a laboratory setting (Lab Test) according to the following international standards:
Laboratory Test
1. Sound Transmission Loss Testing
Conducted according to ISO 10140-2, EN 1793, or ASTM E90 standards
Tests the Sound Transmission Loss (STL) of barriers or material panels
Measures sound insulation performance across specific frequencies, such as 125 Hz to 5000 Hz or broader ranges
Results can be evaluated as ratings like Rw or STC, which numerically represent the material’s sound-blocking performance
ALT provides fully equipped standard testing chambers capable of performing these tests to ensure that selected materials or barriers meet required acoustic performance specifications.
2. Sound Absorption Testing
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Conducted in accordance with ISO 354, ISO 11654, or ASTM C423
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Uses a reverberation chamber to measure the sound absorption properties of materials
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Results are presented as the Sound Absorption Coefficient (SAC) across various frequencies or as the NRC (Noise Reduction Coefficient), which is an average value
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Helps determine how effectively a material absorbs sound within the targeted frequency range
These tests assist designers and developers in selecting the most suitable soundproofing materials based on real-world application requirements.
Field Test
For sound barriers installed in real-world environments, a key method is measuring Sound Insertion Loss (SIL) in accordance with ISO 10847, which evaluates the actual impact of the barrier on the surrounding acoustic environment.
Additionally, modern technology enables in-situ sound absorption testing using the Local Plane Wave technique and Array Microphone systems. In Thailand, there are acoustic specialists capable of conducting such field tests on noise barriers, ensuring that the results accurately reflect real site conditions.