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Polyethylene Resin

Polyethylene Resin


Polyethylene (PE) resins are thermoplastic polymers which means that they may be formed with heat and re-melted without losing their intrinsic characteristics. Thermoplastics differ in this way from thermosets, which undergo permanent change after hardening.

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Polyethylene resins are categorized into three major groups: low density (LDPE), high density (HDPE), and ultra-high molecular weight (UHMW-PE). LDPE is used for making plastic shopping bags, for example; HDPE, for drain pipes; and, UHMW-PE for medical devices. In general, the greater the material’s density, the more crystalline its structure. Higher crystalline structures have higher service temperatures.

LDPE is best described as low strength but highly ductile thus allowing it to stretch without breaking. It is popular for a variety of packaging applications from squeeze bottles to sealing film. HDPE has higher strength but lower ductility, making it useful for products that must retain their form such as garbage cans. HDPE remains serviceable at -60°C. UHMW-PE is very strong, with strength-to-weight ratios approaching that of some steels. Having high resistance to abrasion, it is suitable for special applications such as the timing screws and starwheels of bottling machines, the wear pads of artificial joints, etc.

Like many thermoplastics, polyethylene resins readily absorb moisture. They do not ordinarily require special drying regimes prior to injection molding or other processing.

The material in its natural form is usually white or black and becomes translucent when thinned to the dimensions of milk bottles and the like. Suppliers can adjust the formulation to increase tear strength, transparency, formability, printability, etc., as needed to suit the application at hand.

Specification
Analysis ProjectQuality IndexTest resultExperiment method

Granular appearance

Color grains and black spot grains/k

≤100SH/T 1541.1-2019
large and small, g/kg≤1000SH/T 1541.1-2019
Melt mass flow rate(21.6kg), g/10min4.8-7.26.1Q/SY DS 0511
Density, kg/m3946-950948.9Q/SY DS 0510
Tensile yield stress, MPa≥2224.9Q/SY DS 0512
Tensile stress at break, MPa≥2442.2Q/SY DS 0512
Tensile strain at break, %≥450775Q/SY DS 0512
Application

Polyethylene can be processed by blow molding, extrusion, injection molding and other methods, widely used in the manufacture of thin film, hollow products, fibers and daily necessities. And so on.

(1) Polyethylene (PE) film is widely used as packaging material for various food, medicine, chemical fertilizer, industrial products and agricultural film. It can also be extruded into composite film for packing heavy objects.

(2) polyethylene hollow products: high density polyethylene strength is higher, suitable for hollow products. Can be blown into bottles, barrels, cans, tanks and other containers. Or by casting into tank tank and storage tank and other large containers

(3) polyethylene pipe and plate are suitable for underground laying, table and building materials

(4) polyethylene fiber: can be used as bulletproof vests. Composite materials for automotive and Marine operations.

(5) polyethylene fiber to make bristle silk, flat silk or film fiber, used to make rope, filter cloth, packaging cloth and so on.

(6) Polyethylene miscellany: The miscellany produced by injection molding includes daily miscellany, artificial flowers, turnover boxes, small containers, bicycle and tractor parts, which are used in the manufacture of structural parts.

Package、Tranportation、Storage

The packing is in 25kg plastic bags, which can be transported by rail or sea and stored in a dry warehouse.

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