Plastic raw materials are mainly divided into thermoplastic and thermosetting plastics based on the molecular structure of synthetic resins: thermoplastic plastics refer to those that retain plasticity after repeated heating; common types include PE/PP/PVC/PS/ABS/PMMA/POM/PC/PA, etc. Thermosetting plastics mainly refer to plastics made from synthetic resins that harden upon heating, such as phenolic and melamine plastics, which are not commonly used.

Mainly categorized by application scope, there are general plastics such as PE/PP/PVC/PS, and commonly used engineering plastics like ABS/POM/PC/PA. Additionally, there are also special plastics designed for specific purposes, such as those with high-temperature and humidity resistance, corrosion resistance, and others.

Most plastic raw materials are recyclable, but due to the brittleness of recycled plastic (runner material), it can only be mixed with new materials (raw materials) at a ratio not exceeding 25% for optimal use, adhering to customer requirements as the standard. Different types of plastic materials, due to varying melting points and injection molding pressures, must not be mixed during production.

2. Due to the need for color matching in plastic products, the raw materials for plastics can be categorized as follows: granulated material, color powder material, color concentrate material, and the recently emerged liquid dyeing method in plastic raw materials. Granulated material has the pigment already mixed into the raw material, with each plastic granule colored, ensuring stable and uniform product colors. Color powder material and color concentrate material involve the use of color concentrates or color powders mixed with raw materials, which are cost-effective and do not require storing large amounts of colored raw materials. However, they lack color stability and are challenging to control uniformity during production.