Solid particles are mixed improperly organized. There are no exact shape, such as a polymer glass. Typical properties of natural rubber, etc., similar crystals vary with no exact geometry. Therefore, it is a treasure called the isotropy index refraction is the electrical conductivity and other properties are the same in all directions. In addition, solid asanthan will have no obvious melting point. When the heat is gradually weakens until it flows. This type of solid, melting temperature, it is in the long range. differences from crystals, which are obvious, and the melting point of the solid temperature melt away in this type of narrow range.