What does pp5 grade represent in plastic materials?


This means that plastic products are made of polypropyl […]

This means that plastic products are made of polypropylene, can be used repeatedly, and are resistant to high temperatures.

The bottom part of each special plastic product usually has a triangle mark, which is equivalent to the "ID card" of the product. There are 1~7 numbers in the triangle. Each number represents a plastic container. They are made of different materials, so their use and contraindications are also different.
Plastics are polymer compounds (macromolecules), commonly known as plastics or resins, which are polymerized by monomers as raw materials through addition polymerization or polycondensation reactions. The composition and shape can be freely changed. It is composed of synthetic resins and fillers. Plasticizer, stabilizer, lubricant, pigment and other additives.

The main component of plastic is resin. The term resin was originally named for the lipids secreted by animals and plants, such as rosin, shellac, etc. Resin refers to polymer compounds that have not been mixed with various additives. The resin accounts for about 40% to 100% of the total weight of the plastic. The basic properties of plastics are mainly determined by the nature of the resin, but additives also play an important role. Some plastics are basically composed of synthetic resins, with no or little additives, such as plexiglass and polystyrene.

The so-called plastic is actually a kind of synthetic resin. Its shape is similar to the pine resin in natural resin. It is artificially synthesized by chemical means and is called plastic.

Material characteristics

〈1〉 Chemical resistance

〈2〉 With luster, partly transparent or semi-transparent

〈3〉 Most of them are good insulators

〈4〉 Lightweight and strong

〈5〉 Easy to process, mass production, low price

〈6〉 Wide range of uses, multiple effects, easy to color, partly resistant to high temperature


1. Most plastics have strong corrosion resistance and do not react with acids and alkalis.

2. Plastic manufacturing costs are low.

3. Durable, waterproof and light weight.

4. It is easy to be molded into different shapes.

5. It is a good insulator.

6. Plastics can be used to prepare fuel oil and fuel gas, which can reduce crude oil consumption.

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