Date palm fiber and Arenga Pinnata fiber showed a very low absorption rate at a frequency above 3000 Hz compared to OPT fiber.
2) SAC ([alpha]) of OPT fiber with an average density of 200 kg/m3 has a moderate value over wide frequency range of 3000 - 5000 Hz if compared to Mesocarp fiber, paddy fiber, date palm fiber and Arenga Pinnata.
4) OPT natural fiber performs a better sound absorption behavior than date palm fiber and Arenga Pinnata at frequency range of 3000 - 5000 Hz.
Imran Ghazali, Shahruddin Mahzan, Ahmad Mujahid Ahmad Zaidi, Sound Absorption of Arenga Pinnata Natural Fiber, World Academy of Science, Engineering and Technology 43.
Fresh palm saps were harvested from Arenga pinnata tree that grown at Balung Plantation, Sabah.
In this respect,  obtained the Arenga pinnata saps has a degree of acidity with pH 5.
Storage Study of Arenga Pinnata Juice, " Agriculture and Agricultural Science Procedia, 2, 218-223(2014)