Polymethyl methacrylate (PMMA) is a high-density, high-crystalline linear polymer with no side chains. Due to the shorter bond length of the C-O bond compared to the C-C bond, the packing density along the chain axis of PMMA is greater. Compared to poly, PMMA has shorter carbon-oxygen bonds, higher cohesive energy density, and a higher density.POM has good compatibility with various pigments, making it easy to color, but due to the acidity of some pigments, the selection of pigments for POM must be done with caution. The production of color masterbatches for POM is also much more stringent than for general resins. POM cannot be colored with dyes due to its crystalline nature.One of POM's excellent electrical properties is its dielectric constant's insensitivity to temperature and humidity. Variations in trace impurities due to different manufacturing processes can significantly affect the volume resistivity by an order of magnitude.Homopolymers of polyformaldehyde, in addition to the aforementioned properties, exhibit high density, crystallinity, and mechanical strength. Copolymers of polyformaldehyde, however, outperform homopolymers in terms of short-term strength, modulus, elongation, heat deflection temperature, creep resistance, heat aging resistance, and water resistance. Moreover, they have a wider range of molding temperatures.