To achieve this, there are three methods that can be used: foaming modification, adding light additives, and blending light resins.
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Foam molding of plastic products is the most effective way to reduce their density. The addition of light-weight additives and blending of light-weight resins can only reduce the density to a small extent, and the reduction is generally only about 50%, and the lowest relative density can only reach about 0.5. Plastic foamed products vary widely in density and have a relative density of 10-3.
3M hollow glass microspheres (hollow microspheres) are hollow, closed spherical, powdery ultra-light filling materials. Depending on the particle size and wall thickness, the true density is between 0.12~0.60g/cm3!
White hollow glass microspheres are often added to the filler of artificial marble to significantly improve the performance of the product. In particular, when manufacturing a bathtub, the quality of the product can be reduced and the impact can be improved. The relative density of hollow glass microspheres is 1/16 of that of ordinary mineral powder; when it is substituted for calcium carbonate, the addition amount is only 3%~25% of the total amount of the matrix, which can reduce the product quality by about 35%.
There is also a lightweight filler: wood flour
That is, the fine fibers of wood are very light. But there are certain limitations. You can use different methods according to your own. 