What is the difference between injection grade SBS and extrusion grade SBS

1. production process is different

In the production process, injection molding and extrusion molding are two very different processes. Injection molding is an injection molding process, suitable for the production of a variety of complex shapes of plastic products, and extrusion molding is a continuous molding process, commonly used in the production of long strip and sheet-like plastic products.

The SBS plastic used in injection molding is called "injection grade SBS" because it is mainly used in the injection molding process. This kind of plastic particles can participate in the injection molding process well, but because of its relatively low melting point, it is easy to produce internal stress and uneven cooling shrinkage during the injection molding process, resulting in difficult processing of the product surface and possible scratches.

In contrast, extrusion grade SBS is designed for extrusion molding. The particles have a higher melting point and can be extruded at a higher temperature, thereby reducing internal stress and making the surface of the product smoother and more uniform. The continuity and stability of extrusion molding also makes the extrusion grade SBS better in terms of mechanical properties.

2. physical property differences

In terms of physical properties, there are also significant differences between injection grade SBS and extrusion grade SBS. In the injection molding process, due to its low melting point, it is easily restricted by processing equipment, so its mechanical properties, such as impact strength and wear resistance, are relatively low. Injection molding grade SBS is prone to uneven color and uneven surface during processing.

Extrusion grade SBS is different. Because its particles have a higher melting point, they can be processed at higher temperatures, thereby maintaining higher mechanical properties. Specifically, extrusion grade SBS is superior to injection grade SBS in terms of abrasion resistance, impact strength and thermal stability. Due to the continuity and uniformity of extrusion molding, the surface of the product is smoother and the color is more uniform.

3. Application Areas of Difference

From the perspective of application, there are also obvious differences between injection grade SBS and extrusion grade SBS. Injection grade SBS is mainly used for low-grade plastic products, such as packaging materials, toys, daily necessities, etc. Due to its relatively low price and low cost, injection molding grade SBS has a wide range of applications in these fields.

The extrusion grade SBS is mainly used for the production of high-end plastic products, such as auto parts, high-end packaging materials, precision electronic equipment, etc. Extrusion grade SBS has important application value in these fields due to its higher performance and stability.

4. summary

Injection grade SBS and extrusion grade SBS in the production process, physical properties and application areas are significantly different. Injection grade SBS is suitable for middle and low-grade plastic products, the production process is relatively simple, low cost, but there are certain limitations in mechanical properties and surface quality, while extrusion grade SBS is applied to high-end plastic products, with higher mechanical properties, better processing stability and more uniform product surface, but its production cost and equipment requirements are higher.

The choice of SBS type depends on the specific process requirements, application areas, and the company's production scale and cost tolerance. If you need to produce higher performance plastic products, it is recommended to choose extrusion grade SBS. Conversely, if you only need to produce low-grade plastic products, injection-grade SSBS can also meet the basic needs. I hope this article can help you better understand the difference between injection-grade SBS and extrusion-grade SBS, and make a suitable choice in practical applications.