Quality Identification of Plastic Raw Materials

plastic raw material is a material that is composed of high molecular synthetic resin (polymer) as the main component and infiltrated with various auxiliary materials or certain additives with specific uses. It has plasticity and fluidity under specific temperatures and pressures, can be molded into a certain shape, and maintains its shape under certain conditions.

Zhongke Testing provides plastic raw material quality identification services.

The quality identification of plastic raw materials can be analyzed from the following aspects:

1. Appearance identification of plastics

By observing the appearance of plastics, the major categories of plastic products can be initially identified: thermoplastic plastics, thermosetting plastics or elastomers. Generally, thermoplastics are divided into two categories: crystalline and amorphous. The appearance of crystalline plastic is translucent, opalescent or opaque. It is only transparent in the film state, and its hardness ranges from soft to horny. Amorphous is generally colorless, completely transparent when no additives are added, and has a hardness that is harder than horny rubber (plasticizers and other additives are often added at this time). Thermosetting plastics usually contain fillers and are opaque. If they do not contain fillers, they will be transparent. The elastomer has a rubbery feel and a certain stretch rate.

2. Heating identification method of plastics

The heating characteristics of the above three types of plastics are also different, and they can be identified through heating methods. Thermoplastics soften when heated, melt easily, and become transparent when melted. Filaments can often be drawn from the melt, and they are usually easy to heat seal. Thermosetting plastics are heated until the material chemically decomposes, maintaining its original hardness without softening and relatively stable dimensions, and carbonizing at the decomposition temperature. When the elastomer is heated, it does not flow until the chemical decomposition temperature. When the decomposition temperature reaches the decomposition temperature, the material decomposes and carbonizes.

GB/T 5761-2006 Suspension method general-purpose polyvinyl chloride resin
GB/T 12670-2008 Polypropylene (PP) resin
GB/T 12672-2009 Acrylonitrile-butadiene-styrene (ABS) resin
GB/T 20207.1-2006 Acrylonitrile-butadiene-styrene (ABS) pressure piping system Part 1: Pipe
GB/T 10003-2008 General purpose biaxially oriented polypropylene (BOPP) film
GB/T 3830-2008 Soft polyvinyl chloride calendered film and sheet