the result of measurement of equivalent sound level in workplace (4 hours of overtime, total worked was 12 hours) that the extruder process area (measured on 16 September 2015) is exceed the standard level. Therefore, the company has improved by installing noise insolution, which makes measurement of equivalent sound level in December is decreased in 85.7 dB(A). The company continue to install noise insolution more if the result of measurement of sound level exceed 87 dB(A) and to conduct a hearing conservation program for effectiveness to control the sound level at the source. The company should have measures to control and prevent the hazard of noise as follows;