Plastic balls can be roughly divided into two types: "thermosetting plastic balls" and "thermoplastic plastic balls". According to heat resistance, thermoplastic balls are divided into three categories: general plastic balls, general engineering plastic balls and super engineering plastic balls. In addition, according to the distribution degree of polymer chain, it can be divided into "crystalline plastic ball" and "non crystalline plastic ball".

Thermosetting resin plastic ball is softened by heating and cured by chemical reaction in the molding process. A plastic ball that does not soften or melt even after subsequent heating

Thermoplastic resin softens and can be processed when heated, and solidifies when cooled. A plastic that softens when heated and can be reused.

General plastic ball (general) a thermoplastic resin with low resin price and easy processing. A thermoplastic resin with properties such as hot deformation temperature less than 100 ℃, tensile strength less than 500 kgf / cm2 and impact resistance less than 5 kgf.cm/cm .

Empura resin is mainly used for mechanical parts and mechanical parts. It has excellent mechanical strength and heat resistance, and needs high performance, and its price is much higher than general resin.)

*The definition of empra is unclear, but the physical properties include those with tensile strength of about 500 kg / C or more, bending elasticity of 20000 kg / C or more, and heat resistance of 100 ° C or more.

Super empra is a kind of thermoplastic resin, which can be used for a long time even at the hot deformation temperature of 150 ° C or higher (even higher than that of empra).

A polymer with a regular molecular structure and little crosslinking or branching. In general, not all molecules crystallize. The amount of crystalline part is expressed by crystallinity, and the higher the crystallinity is, the higher the hardness and elastic strength are, and the worse the transparency of the part is.

Amorphous plastics have irregular side chains on the main molecular chain, branched and amorphous polymers. Atypical states include hard glass state and soft rubber state, and usually have excellent transparency.