High density polyethylene, the English name is "High Density Polyethylene", referred to as "HDPE". HDPE is a highly crystalline, non-polar thermoplastic resin. The original HDPE has a milky white appearance and a semi-transparent shape in a thin section. PE has excellent resistance to most living and industrial chemicals. Certain types of chemicals can cause chemical corrosion, such as corrosive oxidants (concentrated nitric acid), aromatic hydrocarbons (xylene), and halogenated hydrocarbons (carbon tetrachloride). The polymer is non-hygroscopic and has good water vapor resistance and can be used for packaging purposes. HDPE has excellent electrical properties, especially high dielectric strength, making it suitable for wire and cable. Medium to high molecular weight grades have excellent impact resistance, both at ambient temperatures and even at low temperatures of -40F.
HDPE is a thermoplastic polyolefin formed by copolymerization of ethylene. Although HDPE was introduced in 1956, the plastic has not yet reached maturity. This versatile material is constantly developing its new uses and markets.
Main characteristics
HDPE is a highly crystalline, non-polar thermoplastic resin. The original HDPE has a milky white appearance and a semi-transparent shape in a thin section. PE has excellent resistance to most living and industrial chemicals. Certain types of chemicals can cause chemical corrosion, such as corrosive oxidants (concentrated nitric acid), aromatic hydrocarbons (xylene), and halogenated hydrocarbons (carbon tetrachloride). The polymer is non-hygroscopic and has good water vapor resistance and can be used for packaging purposes. HDPE has excellent electrical properties, especially high dielectric strength, making it suitable for wire and cable. Medium to high molecular weight grades have excellent impact resistance, both at ambient temperatures and even at low temperatures of -40F. The unique characteristics of various grades of HDPE are the appropriate combination of four basic variables: density, molecular weight, molecular weight distribution, and additives. Different catalysts are used to produce custom specialty polymer. These variables combine to produce HDPE grades for different applications; achieving the best balance in performance.
Product performance
High density polyethylene is a non-toxic, odorless, odorless white granule with a melting point of about 130 ° C and a relative density of 0.941 to 0.960. It has good heat resistance and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. Dielectric properties and environmental stress crack resistance are also good.
Packaging and storage hnsot
Keep away from fire and heat during storage. Keep clean and tidy in the warehouse. Do not mix any impurities. It is strictly prohibited to be exposed to sunlight or rain. Transportation should be stored in a clean, dry, covered compartment or cabin, with no sharp objects such as nails. It is strictly forbidden to mix with organic solvents such as flammable aromatic hydrocarbons and halogenated hydrocarbons.
recycle and re-use
HDPE is the fastest growing segment of the plastics recycling market. This is mainly due to its ease of rework, minimal degradation characteristics and its extensive use in packaging applications. The main recycling is to reprocess 25% of the recycled materials, such as post-consumer recycled (PCR), with pure HDPE to make bottles that are not in contact with food.
PE pipe for water supply is a replacement for traditional steel pipe and polychloroic acid ethylene drinking water pipe.
PE pipe characteristics:
1, PE gas pipe
(1) Reliable connection: The polyethylene pipe system is connected by electric hot melt method, and the strength of the joint is higher than the strength of the pipe body.
(2) Good low temperature impact resistance: The low temperature embrittlement temperature of polyethylene is extremely low, and it can be safely used in the temperature range of -60-60 °C. In winter construction, due to the good impact resistance of the material, the tube will not be brittle.
(3) Good resistance to stress cracking: HDPE has low notch sensitivity, high shear strength and excellent scratch resistance, and environmental stress cracking resistance is also outstanding.
(4) Good chemical resistance: HDPE pipelines can withstand the corrosion of a variety of chemical media, and the chemicals present in the soil will not cause any degradation to the pipeline. Polyethylene is an electrical insulator and therefore does not rot, rust or electrochemically corrode; it also does not promote the growth of algae, bacteria or fungi.
(5) Anti-aging, long service life: Polyethylene pipes containing 2-2.5% of uniformly distributed carbon black can be stored or used outdoors for 50 years without being damaged by ultraviolet radiation.
(6) Good wear resistance: The comparison of wear resistance of HDPE pipe and steel pipe shows that the wear resistance of HDPE pipe is 4 times that of steel pipe. In the field of mud transport, HDPE pipes have better wear resistance than steel pipes, which means HDPE pipes have a longer service life and better economy.
(7) Good flexibility: The flexibility of the HDPE pipe makes it easy to bend. In engineering, the obstacle can be bypassed by changing the direction of the pipe. In many cases, the flexibility of the pipe can reduce the amount of pipe and reduce the installation cost.
(8) Convenient handling: HDPE pipes are lighter than concrete pipes, galvanized pipes and steel pipes. They are easy to handle and install. The lower manpower and equipment requirements mean that the installation cost of the project is greatly reduced.
(9) A variety of new construction methods: HDPE pipelines have a variety of construction techniques, in addition to the traditional excavation methods, a variety of new non-excavation techniques such as pipe jacking, directional drilling, liners, Construction by means of split pipes, etc., is the only option for some places that are not allowed to be excavated, so HDPE pipes are used more widely.
2. PE water supply pipe characteristics:
1. Long service life: Under normal conditions, the minimum service life is 50 years.
2, good sanitation: PE tube is non-toxic, does not contain heavy metal additives, does not scale, does not breed bacteria, and has solved the problem of secondary pollution of drinking water. It complies with the GB/T17219 safety evaluation standard and the relevant health safety evaluation regulations of the Ministry of Health.
3, can withstand a variety of chemical media corrosion: no electrochemical corrosion.
4. The inner wall is smooth, the friction coefficient is extremely low, the passing ability of the medium is correspondingly improved and the wear resistance is excellent.
5, good flexibility, high impact strength, resistant to strong earthquakes, distortion.
6, light weight, convenient transportation and installation.
7. The unique fused connection and hot-melt butt joint and hot-melt socket connection technology make the interface strength high and the pipe body ensure the safety and reliability of the interface.
8. The welding process is simple, the construction is convenient, and the comprehensive construction cost is low.
9, PE environmental health water supply pipe dn20~dn90 is blue, dn110 is blue or black with blue line, other colors need to be customized, the color of the accessory corresponds to the color of the pipe.
10. Low water flow resistance: The HDPE pipe has a smooth inner surface with a Manning coefficient of 0.009. The smooth performance and non-adhesive properties ensure that the HDPE pipe has a higher conveying capacity than conventional pipes, while also reducing the pressure loss and water consumption of the pipe.
Magnetic Hook,Holding Magnets,T Shape Magnet
Jammymag Electronic S&T Co., Ltd. , http://www.xmmagnet.com