It is inevitable that the temperature resistance of PPA is higher than that of PA, but high temperature nylon is not only higher than nylon in temperature, but also higher in tensile strength, hardness, chemical resistance, etc. High temperature nylon, like nylon 66, is a semi crystalline crystalline material.

Causes: Raw materials with impurities such as crystal spots and black spots produced during the shutdown and start-up process due to the overhaul of the plant, and products whose physical properties are between the two authentic materials produced in the process of changing the product type and brand, some of the secondary materials are of good quality, while some are not easy to use, and the overall price is generally lower than the genuine materials.

It is similar to that of recycled materials, but the scope of recycled materials is wider. Basically, all indicators of recycled materials are unstable and risky to use, but the price is only half of the genuine materials. China's GDP has surpassed Japan's and become the world's second largest economy While China's economy is developing rapidly, it is in urgent need of a large number of metal materials. In the face of this pressure, China is often surprised by a hundred tricks, and gradually uses substitutes with the same or even higher performance. The phenomenon of "replacing steel with plastic" has emerged In this environment, PA66 engineering plastics, POM PET, PPE, PC+ABS and other engineering plastics emerge as the times require. In the automotive industry, PA66 engineering plastics are particularly widely used. The engine valve cover in the air intake system of the automobile is also a beneficiary In China, major brands have begun to increase the application proportion of various lightweight materials such as alloy, super strength steel and engineering plastics in automotive products. Although the aluminum industry is facing the survival pressure of overcapacity and low price, China still has huge aluminum consumption demand, and it is a good time to expand aluminum application. In the future, it is necessary to accelerate the formulation of relevant standards and specifications to further expand the development space of the aluminum industry. The automobile can be divided into four systems, of which the intake system is one. The intake system is a collection of parts that introduce air or mixture into the engine cylinder, which is called the engine intake system. Nylon is commonly used in the following auto parts: engine hood, rocker cover, cooling and heating device and fuel tank. Nylon resins used in these fields are usually reinforced with 20~40% glass or other mineral fibers to improve the strength.