SOUND TRANSMISSION CLASS (STC) OF FIXED WINDOW GLAZING IN WARM HUMID ENVIRONMENT

Mediastica, Christina Eviutami and Kristanto, Luciana and Anggono, Juliana and Suhedi, Fefen and PURWANINGSIH, HARIYATI (2015) SOUND TRANSMISSION CLASS (STC) OF FIXED WINDOW GLAZING IN WARM HUMID ENVIRONMENT. In: 7th International Conference on Environmental Science and Development (ICESD), 07-10-2015 - 07-10-2015, Athena - Greece.

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Abstract

Acoustic property of glass material for window in term of sound transmission class (STC) within a warm humid environment of Indonesia is studied. Earlier research, books, and glass manufacturer’s manual informs STCs of glass material. Nevertheless, the use of glass in buildings in warm humid air may cause a decrease or increase in STC differs to that of manual. The fluctuation of STC is estimated to be affected by warmer air. In the case of developing country such as Indonesia, limited knowledge and awareness of Indonesians may also lead to different installation techniques and supporting materials used that may create variation in STCs compared to the manual or standard. A series of laboratory test was conducted to see STCs of Indonesia glass in a conditioned temperature higher than is outlined by ASTM. The relative humidity was also set to represent relative humidity of Indonesia. Composite wall testing method by ASTM E90-09 was employed for fixed window glass tests. The tests inform that STC of Indonesia glass slightly lower to that of UK glass, i.e. Pilkington. Variety in glass types (transparent ordinary float/flat/monolithic glass, laminated, tempered, and frosted glass) did not produce significant STCs variation, which is 1-2 only. Higher room temperature of 31-32C also produced no significant STCs, which is 1 only. This may become a new reference that temperature variation in test room do not play significant role as long as the temperature has no impact on molecular deformation of the test specimen. Confirm to earlier studies, it is concluded that the most decisive factor of glass material used for fixed window system is density, which for these test specimens remains at approximately 25 kg/m2. Further investigation on molecular formation of glass material and study on open window glass is recommended.

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