Sources: Prometheus Materials, Boulder, Colo.; CP staff Prometheus Materials, developer of bio-cement and bio-concrete technology debuting in molded, dry cast products, reports strong performance of 2-in. thick specimens subjected to ASTM C423-23, Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method. Testing at the Johns Manville Technical Center in Littleton, Colo., determined that the…
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