The Advantages of Plastic
Easy to process, easy to manufacture(easy to mold)
Even if the geometry of the product is quite complex, as long as it can be demoulded from the mold, it is relatively easy to make. Therefore, its efficiency is far better than that of metal processing, especially injection molding products. After a process, a very complicated finished product can be produced.
Can be freely colored as needed, or made into transparent products
The use of plastic can make colorful, transparent and beautiful products, can still be arbitrarily colored characteristics, can increase its commodity value, and give people a bright feeling.
Can be made into lightweight high-strength products
Compared with metal and ceramic products, the quality is light, the mechanical properties are good, and the strength(ratio of strength to density) is higher, so lightweight high-strength products can be made. Especially after filling glass fiber, it can increase its strength.
In addition, due to the light quality of plastics, it can save energy, so its products are also becoming lighter and lighter.
No Rust, no corrosion.
Plastics are generally resistant to the corrosion of various chemicals and are not as prone to rust or corrosion as metals. Do not worry about the erosion of acids, bases, salts, oils, drugs, humidity, and molds.
Easy to heat transfer, good thermal insulation
Because plastic has a large specific heat, low thermal conductivity, and is not easy to transfer heat, its thermal insulation and insulation effect is good.
It can be made into conductive parts and insulation products
Plastic itself is a good insulator. At present, it can be said that no electrical product does not use plastic. However, if the plastic is filled with metal powder or debris to form, it can also be made into a well-conductive product.
Excellent shock absorber and muffler performance and good light transmission
Plastics have excellent shock absorber and muffler properties; Transparent plastics(such as PMMA, PS, PC, etc.) can make transparent plastic products(such as lenses, signs, covers, etc.).
Low manufacturing costs
Although the plastic raw material itself is not so cheap, because the plastic is easy to process and the equipment is relatively cheap, it can reduce the cost of the product.
Plastic properties based on their strengths and weaknesses
The disadvantages of plastics
Low heat resistance, easy to burn
This is the biggest drawback of plastics. Compared with metal and glass products, its heat resistance is far lower, the temperature is slightly higher, it will deform, and it is easy to burn. Most plastics can produce large amounts of heat, smoke and toxic gases during combustion; Even thermosetting resins that exceed 200 degrees Celsius will smoke and produce peeling.
As the temperature changes, so does the nature
The high temperature is not easy to say. Even if it encounters low temperatures, various properties will greatly change.
Low mechanical strength
Compared with the same volume of metal, mechanical strength is much lower, especially thin products, this difference is particularly obvious.
Easily corroded by special solvents and drugs
In general, plastics are less vulnerable to chemical corrosion, but some plastics(such as PCs, ABS, PS, etc.) are particularly poor in this regard; In general, thermosetting resins are quite corrosive.
Poor durability, easy to age
Whether it is strength, surface gloss or transparency, it is not durable and there is a creep phenomenon under load. In addition, all plastics are afraid of ultraviolet light and sunlight, and will age under the influence of light, oxygen, heat, water and the atmosphere.
Vulnerable to damage, dust and dirt
The surface hardness of plastics is relatively low and it is easy to be damaged. In addition, because it is an insulator, it has static electricity and is therefore easily contaminated with dust.
Poor dimensional stability
Compared with metals, plastic has a high shrinkage rate, so it is difficult to ensure dimensional accuracy. Dimensions change with time when moisture, moisture absorption or temperature changes during use.