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From the advantages and disadvantages of plastic characteristics
- Oct 24, 2018 -

Advantages of plastics

Easy to process, easy to manufacture (easy to shape)

Even if the geometry of the product is quite complex, it is easier to manufacture if it can be demolde from the mold. Therefore, its efficiency is far better than metal processing, especially injection molding products, after a single process, can produce very complex finished products.

It can be coloured or made into transparent products according to needs.

Plastic can be used to make colorful, transparent and beautiful products, but also can be arbitrarily colored characteristics, can improve the value of its commodities, and give a lively feeling.

It can make light and high strength products.

Compared with metal and ceramic products, light weight, good mechanical properties, high specific strength (strength to density ratio) can be made into light and high strength products. Especially after filling fiberglass, it can improve its strength.

In addition, because the quality of plastics is light and energy saving, its products are becoming lighter.

No rust, no corrosion.

Plastics are generally resistant to corrosion of various chemicals and will not rust or corrode like metals. When used, there is no need to worry about erosion, such as acid, alkali, salt, oil, medicine, humidity and mould.

It is difficult to heat transfer and heat preservation.

Because of its high specific heat, low thermal conductivity and difficult heat transfer, the insulation and heat insulation effect of the plastics is good.

It can not only make conductive parts, but also make insulation products.

Plastic itself is a good insulating material, it can be said that no electrical products do not use plastic. But if plastic powder or chips are filled in the plastic, it can also be made into conductive products.

Excellent damping and silencer, good transmittance.

Plastics have excellent shock absorption and noise attenuation properties; transparent plastics (such as PMMA, PS, PC, etc.) can be used to make transparent plastic products (such as lenses, signs, cover plates, etc.).

Low manufacturing cost

Plastic materials themselves are not so cheap, because plastics are easy to process, equipment costs are relatively low, so can reduce the cost of products.

Disadvantages of plastics

Poor heat resistance and easy to burn

This is the biggest disadvantage of plastics, compared with metal and glass products, its heat resistance is far inferior, slightly higher temperature, will be deformed, and easy to burn. Most plastics produce large amounts of heat, smoke, and toxic gases when burned; even thermosetting resins smoke and peel when they reach 200 degrees Celsius.

With the change of temperature, the properties will be greatly changed.

The high temperature is self-evident, even if encounter low temperature, all kinds of properties will also change greatly.

Low mechanical strength

Compared with the same volume of metal, mechanical strength is much lower, especially for thin products, this difference is particularly obvious.

Easy to be corroded by special solvents and medicines.

Generally speaking, plastics are less susceptible to chemical corrosion, but some plastics (such as PC, ABS, PS, etc.) are particularly poor in this respect; in general, thermosetting resin corrosion resistance is quite strong.

Poor durability and easy ageing

Whether it is strength, surface gloss or transparency, they are not durable and are subject to creep at load. In addition, all plastics are afraid of ultraviolet light and sunlight, under the action of light, oxygen, heat, water and atmospheric environment aging.

Vulnerable to damage, and easily contaminated with dust and dirt.

Plastic surface hardness is relatively low, vulnerable to damage; in addition, because it is an insulator, so with static electricity, so easy to be contaminated with dust.

Poor dimensional stability

Compared with metal, plastic shrinkage is very high, so it is difficult to ensure dimensional accuracy. The size changes easily with time during wetting, moisture absorption or temperature changes.