Brief introduction to high density polyethylene and usages of HDPE granules

Brief introduction to high density polyethylene and usages of HDPE granules

High Density Polyethylene (referred to as “HDPE”), also known as low pressure polyethylene, is a kind of High crystallinity, non-polar surface shows a certain degree of translucent shape.PE has excellent resistance to most domestic and industrial chemicals.


Basic properties: High density polyethylene is a kind of opaque white waxy material, the specific gravity is lighter than water, the specific gravity is 0.941~0.960, soft and ductile, but slightly harder than LDPE, but also a little longer, non-toxic, tasteless.


Combustion characteristics: flammable, can continue to burn after leaving the fire, the upper end of the flame is yellow, the lower end of the flame is blue, the combustion will melt, there is liquid dripping, no black smoke, at the same time, emit the smell of paraffin combustion.


Main advantages: acid and alkali resistance, organic solvent resistance, excellent electrical insulation, low temperature, can still maintain a certain toughness.The surface hardness, tensile strength, rigidity and other mechanical strength are higher than LDPE, close to PP, tougher than PP.

Brief introduction to high density polyethylene and usages of HDPE granules

Main usages of HDPE granules:

1.Injection products: turnover boxes, bottle caps, barrels, caps, food containers, plates, dustbins, boxes, and plastic flowers.

2.Blow molding products: hollow molding products, such as a variety of series of blow molding barrels, containers, bottles, containing detergents, chemicals, cosmetics, gasoline boxes, daily use products, etc.There are blown film products such as food packaging bags, grocery shopping bags, fertilizer lining film, etc.

3.extruded products: pipe, pipe fittings are mainly used in gas transportation, public water and chemical transportation, such as building materials drainage pipe, gas pipe, hot water pipe, etc. : sheet is mainly used for seats, suitcases, handling containers, etc.

4.Rotation molding: injection molding products such as large containers, storage tanks, barrels, boxes, etc.

5.polyethylene can be processed into film, wire and cable sheath, pipe, a variety of hollow products, injection products, fiber and so on.Widely used in agriculture, packaging, electrical and electronic, machinery, automobiles, daily necessities and other aspects.


You can buy different kinds of HDPE granules from many famous brands at home and abroad from IMRI at a competitive price.

Particle Size of Kaolin

Particle size distribution refers to the proportion (expressed as percentage) of particles in natural kaolin in a given continuous range of different particle sizes (expressed as mesh mesh in millimeters or microns). The size and distribution of kaolin particles have great influence on its properties and applications. Such as viscosity, specific surface, fluidity, adhesion, covering force, brightness and the difficulty of processing and purification, sintering shrinkage, sintering hardness, chemical catalytic activity and so on are related to particle size and shape. Kaolin ore needs to be processed by technology, and whether it is easy to be processed to the required fineness has become one of the criteria to evaluate the quality of ore.

Kaolin powder body is a collection of statistical particles whose distribution varies with powder manufacturing process or natural formation process. Due to many influencing factors, particle size measurement and particle size distribution are very complicated. For example, an experiment shows that after calcination, the particle size of coal-measure kaolin changes, and the change range of fine particle composition is significantly higher than that of coarse particle composition. The particle size measurement methods of kaolin include laser method, sedimentation method, photon cross correlation spectroscopy method, sifting method, microscope method, ultrasonic particle size analysis method, X-ray small Angle diffraction method and so on.

Various industrial departments have specific requirements on the granularity and fineness of kaolin for different uses. For example, the content of kaolin less than 2μm used as coating in the United States accounts for 90-95%, and that of papermaking filler less than 2μm accounts for 78-80%. China requires that the content of kaolin less than 10μm for coatings be more than 70%, and that of papermaking fillers less than 2μm be more than 70%.

The content of less than 2μm of kaolin from our company can reach 85-86%. The particle size distribution diagram is obtained by using laser method as follows: