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Polyethylene

Product Name
Polyethylene
CAS No.
9002-88-4
Chemical Name
Polyethylene
Synonyms
CPE;fp4;ppe2;Cipe;Dynh;FP 4;Grex;hdpe;Irax;LDPE
CBNumber
CB5128662
Molecular Formula
C2H4
Formula Weight
28.05316
MOL File
9002-88-4.mol
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Polyethylene Property

Melting point:
92 °C
Boiling point:
48-110 °C(Press: 9 Torr)
Density 
0.962 g/mL at 25 °C
Flash point:
270 °C
storage temp. 
-20°C
form 
powder
Specific Gravity
0.95
color 
White
Water Solubility 
Soluble in acetone and benzene. Insoluble in water.
Merck 
14,7567
Stability:
Stable, but breaks down slowly in uv light or sunlight. Incompatible with halogens, strong oxidizing agents, benzene, petroleum ether, aromatic and chlorinated hydrocarbons, lubricating oils.
NIST Chemistry Reference
Polyethylene(9002-88-4)
IARC
3 (Vol. 19, Sup 7) 1987
EPA Substance Registry System
Polyethylene (9002-88-4)
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Safety

Safety Statements 
22-24/25
WGK Germany 
3
RTECS 
TQ3325000
TSCA 
Yes
HS Code 
39041090
Hazardous Substances Data
9002-88-4(Hazardous Substances Data)
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Hazard and Precautionary Statements (GHS)

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
GF89347809
Product name
Polyethylene - U.H.M.W.
Purity
(UHMW PE), rod, diam. 20?mm, L 100?mm, condition machining feedstock
Packaging
1 ea
Price
$218
Updated
2021/03/22
Sigma-Aldrich
Product number
GF89347809
Product name
Polyethylene - U.H.M.W.
Purity
(UHMW PE), rod, diam. 20?mm, L 100?mm, condition machining feedstock
Packaging
2 ea
Price
$248
Updated
2021/03/22
Sigma-Aldrich
Product number
GF89347809
Product name
Polyethylene - U.H.M.W.
Purity
(UHMW PE), rod, diam. 20?mm, L 100?mm, condition machining feedstock
Packaging
5 ea
Price
$324
Updated
2021/03/22
Sigma-Aldrich
Product number
GF06845609
Product name
Polyethylene - Low Density
Purity
(LDPE), film, thickness 0.025?mm, L 1?m, coil width 600?mm
Packaging
1 ea
Price
$326
Updated
2021/03/22
Sigma-Aldrich
Product number
1546707
Product name
High Density Polyethylene
Purity
United States Pharmacopeia (USP) Reference Standard
Packaging
3strips
Price
$366
Updated
2021/03/22
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Polyethylene Chemical Properties,Usage,Production

Chemical Properties

Chemical and physical properties are markedly affected by increasing density, which is affected by the shape and spacing of the molecular chain. Low-density materials have highly branched and widely spaced chains, whereas high-density materials have comparatively straight and closely aligned chains. Low-density polyethylene (0.926–0.9409 g/cm3) is soluble in organic solvents at temperatures higher than 200°F. It is insoluble at room temperature. High-density polyethylene (0.041–0.965 g/cm3) is hydrophobic, permeable to gas, and has high electrical resistivity.
Low molecular weight polyethylenes have excellent electrical resistance and resistance to water and to most chemicals. Medium molecular weight polymers are waxes miscible with paraffin wax, and polyethylene polymers whose molecular weights are higher than 10,000 are the familiar tough and strong resins that are flexible or stiff. By varying the catalyst and methods of polymerization, properties such as density, crystallinity, molecular weight, and polydispersity can be regulated over wide ranges. Polymers with densities ranging from approximately 0.910 to 0.925 g/cm3 are low-density polyethylenes; those with densities ranging from 0.926 to 0.940 g/cm3 are medium-density polyethylenes; and those with densities ranging from 0.941 to 0.965 g/cm3 and higher are high-density polyethylenes.


As the crystallinity or density increases, the products generally become stiffer and stronger and have a high softening temperature and high resistance to penetration by liquids and gases. At the same time, they lose some of their resistance to tear and environmental stress cracking.
High-density PE (HDPE) is a chemically pure, porous plastic implant material that can perform supportive functions. The material has good tissue biocompatibility and permits ingrowth of connective tissue with related vascularization. The material is being used more frequently in nasal surgery.
Polyethylene can be cross-linked by irradiation (electron beam, gamma, or X radiation) or by free radical catalysts such as peroxides.

Definition

Polyethylene is a flexible waxy translucentpolyalkene thermoplastic made in avariety of ways producing a polymerof varying characteristics. In the ICIprocess, ethene containing a trace of oxygen is subjected to a pressure inexcess of 1500 atmospheres and atemperature of 200°C. Low-densitypolyethene (r.d. 0.92) has a formulaweight between 50 000 and 300 000,softening at a temperature around110°C, while the high-density polythene(r.d. 0.945–0.96) has a formulaweight up to 3 000 000, softeningaround 130°C. The low-density polymeris less crystalline, being more atactic.Polyethene is used as aninsulator; it is acid resistant and iseasily moulded and blown.
Polyethylene is a water-repellent, white, tough, leathery, thermoplastic resin very similar in appearance to paraffin wax. Properties vary from a viscous liquid at low molecular weights to a hard waxlike substance at high molecular weights. It is used as a coating for glass bottles and fiberglass fabrics (special treatments for glass are required to obtain good adhesion between polyethylene and glass) and is also used as an injection-molding material for ceramics.
In the polymerization process, the double bond connecting the carbon atoms is broken. Under the right conditions, these bonds reform with other ethylene molecules to form long molecular chains. Ethylene copolymers, EVA, and EEA are made by the polymerization of ethylene units with randomly distributed comonomer groups, such as vinyl acetate (VA) and ethyl acrylate (EA).

Uses

Polyethylene (PE) is a thermoplastic polymer consisting of long hydrocarbon chains. PE is used in a number of applications including flexible film packaging produced by the blown film process. Polyethylene is used to regulate viscosity, suspension properties, and general stability in cosmetic formulations. Typical applications included specialty injection molded parts, in these fields Polyethylene has a wide range of uses:
Injection and blow molded toys, housewares and lids.
Injection molded car seats, mower parts and pails.
Injection molded, thin-walled containers and housewares.
Hot melt coating for paper, additive in cast moldings, candles, oil-based inks and hot melt adhesives.
Additive to unsaturated polyesters, epoxides and other polymers to impart the unique properties of UHMWPE. Used in industrial parts, coatings and wear surfaces at 10-40 wt. %.
Film applications having good drawdown and toughness.
Mold release additive, lubricant in rubber processing, extrusion and calendering aid for PVC and dispersing aid for color concentrates.
Bearings, gears, bushings and other moving parts.
Laboratory tubing; in making prostheses; electrical insulation; packaging materials; kitchenware; tank and pipe linings; paper coatings; textile stiffeners.
polyethylene is used to regulate viscosity, suspension properties, and general stability in cosmetic formulations. It is derived from petroleum gas or dehydration of alcohol.

Industrial uses

Polyethylene thermoplastic resins include lowdensity polyethylenes (LDPE), linear low-density polyethylenes (LLDPE), high-density polyethylenes (HDPE), and ethylene copolymers, such as ethylene-vinyl acetate (EVA) and ethylene- ethyl acrylate (EEA), and ultrahighmolecular- weight polyethylenes (UHMWPE). The basic properties of polyethylenes can be modified with a broad range of fillers, reinforcements, and chemical modifiers, such as thermal stabilizers, colorants, flame retardants, and blowing agents. Major application areas for polyethylenes are packaging, industrial containers, automotive, materials handling, consumer products, medical products, wire and cable insulation, furniture, housewares, toys, and novelties.
LDPE, the first of the polyethylenes to be developed, has good toughness, flexibility, low-temperature impact resistance, clarity in film form, and relatively low heat resistance. Like the higher-density grades, LDPE has good resistance to chemical attack.
One of the fastest-growing plastics is linear LLDPE, used mainly in film applications but also suitable for injection, rotational, and blow molding. Properties of LLDPE are different from those of conventional LDPE and HDPE in that impact, tear, and heat-seal strengths and environmental stress-crack resistance of LLDPE are significantly higher. Major uses at present are grocery bags, industrial trash bags, liners, and heavy-duty shipping bags for such products as plastic resin pellets.
Rigidity and tensile strength of the HDPE resins are considerably higher than those properties in the low- and medium-density materials. Impact strength is slightly lower, as is to be expected in a stiffer material, but values are high, especially at low temperatures, compared with those of many other thermoplastics.
HDPE resins are available with broad, intermediate, and narrow molecular-weight distribution, which provides a selection to meet specific performance requirements. As with the other polyethylene grades, very-high-molecular- weight copolymers of HDPE resins are available with improved resistance to stress cracking.
Applications of HDPE range from film products to large, blow-molded industrial containers. The largest market area is in blowmolded containers for packaging milk, fruit juices, water, detergents, and household and industrial liquid products. Other major uses include high-quality, injection-molded housewares, industrial pails, food containers, and tote boxes; extruded water and gas-distribution pipe, and wire insulation; and structural-foam housings. HDPE resins are also used to rotationally mold large, complex-shaped products such as fuel tanks, trash containers, dump carts, pallets, agricultural tanks, highway barriers, and water and waste tanks for recreational vehicles.

Production Methods

Linear PE is produced by a low-pressure solution or gasphase process that is initiated by a variety of transition metal catalysts. The most common catalysts are Ziegler titanium compounds with aluminum alkyls and Phillips chromium oxide-based catalysts. The gas-phase and slurry processes are used to produce high molecular weight, high-density (HMW-HDPE) products. The highest density linear PEs can be made from an α-olefin comonomer, typically octene for the solution process and butene or hexene for the gas-phase process. Linear PE does not have long-chain branches and is therefore more crystalline. The short-chain branches found in linear PE serve as tie molecules, which give the higher α -olefin copolymers improved puncture and tear properties. Included in the linear PE family are ultra-low-density PE (ULDPE), LLDPE, and HDPE.
HDPE’s main use is in blow-molded products such as milk bottles, packaging containers, drums, car fuel tanks, toys, and houseware. Film and sheet are widely used in wrappings, refuse sacks, carrier bags, and industrial liners. Injection molding products include crates, pallets, packaging containers, houseware, and toys. Extrusion grades are used in pipes, conduit, wire coating, and cable insulation.
LLDPE is a thermoplastic that in many applications replaces its predecessor, low-density polyethylene (LDPE), or is used in blends with LDPE. In particular, LDPE’s shortchain branching gives it higher tensile strength, puncture, and anti-tear properties, making it especially suitable for film applications.

Agricultural Uses

LDPE is short for low density polyethylene. LDPE sheets are used for lining jute bags in which fertilizers are stored. LDPE acts as a waterproofing material.

Safety Profile

Questionable carcinogen with experimental tumorigenic data by implant. Reacts violently with F2. When heated to decomposition it emits acrid smoke and irritating fumes.

Carcinogenicity

IARC reports that data available do not allow the evaluation of carcinogenicity of ethylene in humans. Rats exposed to ethylene by inhalation show no increase in tumor incidence.

Purification Methods

Crystallise it from thiophen-free *benzene and dry it over P2O5 under vacuum.

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Polyethylene Suppliers

Chengdu XiYa Chemical Technology Co., Ltd.
Tel
;
Fax
0539-6365991
Email
sale@xiyashiji.com;3007716753@qq.com
Country
China
ProdList
10578
Advantage
57
Shanghai Dingfen Chemical Technology Co., Ltd.
Tel
021-57450129- ;021-37590756-
Fax
021-57450128
Email
2789251452@qq.com;369405814@qq.com
Country
China
ProdList
7665
Advantage
58
J & K SCIENTIFIC LTD.
Tel
010-82848833- ;010-82848833-
Fax
86-10-82849933
Email
jkinfo@jkchemical.com;market6@jkchemical.com
Country
China
ProdList
96815
Advantage
76
Alfa Aesar
Tel
400-610-6006; 021-67582000
Fax
021-67582001/03/05
Email
saleschina@alfa-asia.com
Country
China
ProdList
30159
Advantage
84
BeiJing Hwrk Chemicals Limted
Tel
0757-86329057-
Fax
0757-86311057
Email
sales.gd@hwrkchemical.com
Country
China
ProdList
17295
Advantage
55
Energy Chemical
Tel
021-58432009-
Fax
021-58436166
Email
sales8178@energy-chemical.com
Country
China
ProdList
43503
Advantage
61
BEST-REAGENT
Tel
400-1166-196;028-84555506- ;028-84555506-
Email
cdhxsj@163.com;1955352637@qq.com;cdhxsj@163.com
Country
China
ProdList
11718
Advantage
57
Sinopharm Chemical Reagent Co,Ltd.
Tel
86-21-63210123
Fax
86-21-63290778 86-21-63218885
Email
sj_scrc@sinopharm.com
Country
China
ProdList
9844
Advantage
79
BOC Sciences
Tel
Email
info@bocsci.com
Country
United States
ProdList
21113
Advantage
65
Beijing HuaMeiHuLiBiological Chemical
Tel
010-56205725;010-86181995
Fax
010-65763397
Email
waley188@sohu.com
Country
China
ProdList
12341
Advantage
58
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View Lastest Price from Polyethylene manufacturers

Wuhan wingroup Pharmaceutical Co., Ltd
Product
PE Polyethylene CAS 9002 88 4 9002-88-4
Price
US $1.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
5000MT/Month
Release date
2021-06-29
Hebei Zhanyao Biotechnology Co. Ltd
Product
Polyethylene 9002-88-4
Price
US $10.00/KG
Min. Order
1Kg/Bag
Purity
99%
Supply Ability
20 tons
Release date
2021-10-15
Wuhan Shuokang Biological Technology Co.,Ltd
Product
poly(ethylene) 9002-88-4
Price
US $10.00/g
Min. Order
1KG
Purity
99%
Supply Ability
5000tons
Release date
2021-08-30

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