Polyurethane sponge Advantages: cheap, good sound-absorbing effect. Disadvantages: highly absorbent, easy to arouse朽腐plate. Weathering the ability of general, long-term use may be decomposition of powder. Butyl mud offset Advantages: excellent noise absorber performance. Disadvantage: poor flame retardant properties, emit a lot of smoke when burned. Stereotype Advantages: excellent noise performance, excellent low-frequency隔阻. Disadvantages: heavy metal, not environmental protection. Aluminum honeycomb Advantages: the intensity is good, has good insulation effect. Disadvantage: no vibration absorber effect on the bends, the angular position of construction difficulties, board and board-bit easy to form connections between the sound leakage. Aluminum Silicate cotton Advantages: low cost, high-frequency noise absorption ability. Disadvantages: poor sound effects, easy to water, on the human body has hazards, not environmental protection. Industrial rubber sheet Advantages: soft, waterproof, has a certain fire resistance, noise has a certain sex. Disadvantage: the high degree of combustion of tobacco to generate a lot of smoke Weather resistance poor, long-term use may be split decomposition. Flame-retardant polyethylene foam board Advantages: Low Smoke Flame Retardant, sound-absorbing performance, the quality of light. Disadvantage: The poor low-frequency barrier. Sunroad noise absorber plate Good noise performance vibration absorber to effectively prevent the formation of plate vibration sound leakage. Excellent weather resistance, and excellent air tightness and water tightness, fire-retardant low smoke density, green environmental protection. Comparison of noise standards material We believe that the use of noise in the ship noise reduction materials should, whenever possible, meet the following criteria: 1, in the framework of a broadband noise performance of a good, sound long-term stable and reliable performance. 2, moisture-proof waterproof, decay mothproof, not moldy, not water. 3, fire retardant, low smoke density. 4, green materials, non-mineral fiber cotton, heavy metals, toxic gases and other harmful substances. 5, has a good vibration absorber capacity, to prevent the formation of plate resonance and acoustic leakage. 6, to facilitate the construction material itself. 7, has a certain mechanical physical properties and difficult to aging, weathering performance, long service life. 8, in the temperature range, noise performance variation is smaller, the performance of damping vibration absorber to be guaranteed