1. The sound insulation
Core foams have excellent sound insulation properties and are increasingly important in sound insulation applications. Sound insulation foam is specifically used in cinemas, theaters, concert halls and other wall decoration materials and ceiling materials, using foam with good sound insulation performance to absorb sound to prevent echoes and affect sound quality; the interior partition walls of buildings are made of foam materials, with Sound insulation. Commonly used foam materials for sound insulation include PU flexible foam materials, PS bead board, PVC (emulsion), PF and PE, etc.


2. Anti-shock
Foamed plastic products are a good shock-absorbing material and can be used as high-grade packaging materials, such as packaging materials for fragile goods, household appliances and precision instruments. Foam materials that can be used for shockproofing include EPS, PE, soft and semi-soft PU, etc. Utilize high resilience: Most of the foamed plastics with high expansion ratio have good resilience, and some varieties also have high resilience, which can be used in sports equipment, shoe soles, sofas and cushions. There are two types of foams with high resilience, PU and PE, and soft PU foams are commonly used.



3. Insulation
The thermal conductivity of ordinary plastic products is mostly in the range of 0.15 to 0.22W/(m, K), while the thermal conductivity of foamed plastics is generally in the range of 0.01 to 0.04W/(m. K), which is lower than that of ordinary plastic products. 15 to 50 times as much, with excellent thermal insulation properties. The resins commonly used for thermal insulation foam products include rigid PU, PF, urea-formaldehyde and PS.

Use at high temperature, pay attention to the heat-resistant temperature of different varieties when selecting them. PS and PVC should be used at low temperature, and PU and PF should be used at high temperature. Urea-formaldehyde foam has good thermal insulation, and has the advantages of flame retardancy, low price and wide source; but because of its high brittleness and serious water absorption, it affects its wide application. It can now be widely used in building insulation, reducing house heat loss by 70%.




4. Utilize lightness and closed-cell properties
The floating material requires the relative density of the foam to be small and must be a closed-cell foam with a high expansion ratio. The resins that can be used for floating foam are mainly PVC, PE and PS. For open-celled microcellular foam, it has the property of permeating liquid and can be used as filter material, water-absorbing material and flower and tree transplant material. Specific available resins are F4, cellulose acetate, nitrocellulose, PA, PVC and PP. Most core foams have the advantage of being soft yet strong and can be used as shoulder pads for garments. Specifically available are PE and PU flexible foam.