Pictured above is a photograph of the Joylenge™ melamine foam under an electron microscope. It can be seen that the product has a fully open three-dimensional grid structure, which is completely connected by a fiber structure and has a density of only 4-20 Kg/m³. Ordinary foams generally have a semi-opening structure, and the opening ratio is low, and a semi-closed pore-like structure appears. This semi-opening structure can seriously affect the sound absorption and heat insulation performance.
The frequency of the sound that can be heard by the human ear is 20 Hz to 20000 Hz, of which 500 Hz to 2000 Hz belongs to the intermediate frequency sound wave, and the human ear is most sensitive to the sound waves of this part of the frequency. Joylenge™ melamine foam has a very significant absorption effect on medium and high frequency sound waves, which is far superior to commonly used sound absorbing materials such as glass wool. In the lower frequency band, in order to achieve good sound absorbing effect, the thickness of sound absorbing material must be increased. The advantages of Joylenge™ melamine foam are even more pronounced.
The following is the latest sound absorption performance test data of Joylenge™ melamine foam tested according to DIN52215:
Jo The thickness of 4cm Joylenge™ melamine foam can reach 50% for sound waves above 700Hz, and 90% for sound waves above 1500Hz;
Jo The thickness of 5cm Joylenge™ melamine foam can absorb 50% of the sound wave above 450Hz, and the absorption rate of sound wave above 1000Hz can reach 90%;
Jo The 6cm thick Joylenge™ melamine foam can absorb 50% of the sound waves above 350Hz, and the absorption rate of sound waves above 800Hz can reach 90%;
The Joylenge™ melamine foam with a thickness of 8cm can absorb 50% of the sound waves above 250Hz, and the absorption rate of sound waves above 600Hz can reach 90%;
Jo Joylenge™ melamine foam with a thickness of 10cm can absorb 50% of the sound waves above 200Hz, and the absorption rate of sound waves above 400Hz can reach 90%.
