The main purpose of PORON (foam) as follows: 
 (1) sandwich panel: the role - no pollution, prevent loosening, to prevent impact noise, to prevent adhesion. 
 (2) LED around: to prevent light leakage, absorb shock, Tam tightness. 
 (3) the PCB under the periphery: to absorb the impact and absorb shock, to fill the gap insulation effect. 
 (4) keyboard pads: rebound, no pollution, good dimensional stability. 
 (5) battery around: no pollution, absorb the impact of sound to improve the air tightness. 
 (6) pads: frictional, non-polluting, good dimensional stability. 
 (7) drives the rear pads: absorb shock, prevent impact noise, improve air tightness. 
 (8) friction pads: frictional, non-polluting, good dimensional stability. 
 (9) The disk cap cushion: shock-absorbing, interdiction motor noise, shock and improve air tightness. 
 (10) speakers around: To prevent noise, to fill the gap. 
 (11) LCD around: dust, absorb shock, to fill the gap increase shading