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POLYETHYLENE
Low
Density Polyethylene (LDPE): A corrosion resistant, extruded material
that sustains low moisture permeability. It also has a relatively low
working temperature, soft surface and low tensile strength.
High Density Polyethylene (HDPE): is a high impact strength and high density polyethylene. HDPE has excellent tensile strength, energy absorption, abrasion resistance and resistance to stress cracks.
Pipe Grade Polyethylene (HMW HDPE): features a higher molecular weight than our standard HDPE for a variety of applications requiring higher performance characteristics. With 2% carbon black, it is used in demanding outdoor applications. Used in wide applications, including flanges, stub ends and manhole covers for industrial piping systems.
Product Applications
Low Density Polyethylene (LDPE): LDPE services the following industries: Anodizing, Chemical, Dyeing/Bleaching, Electronics, Fertilizer, Food Processing, Marine, Paper, Petroleum, Pharmaceutical, Plating, Steel Pickling, Textile, Tanning, Transportation and Utilities.
High Density Polyethylene (HDPE): Business Machine Parts, Cams/Washers/Shims, Guides/Wear Plates, Laboratory Vessels, Low Speed Bearings, Nuclear Storage Containers, Packing/Rings in Chemical Applications, Roll Stand Bearings, Rotors/Blades, Skids/Deflector Plates and Tank/Chute/Bin Linings.
Pipe Grade Polyethylene (HMW HDPE): is used in a wide variety of applications requiring higher performance characterisitics than HDPE. Pipe Grade has better UV resistance than standard natural HDPE, which makes it the product of choice in many outdoor applications such as piling protectors and buoyancy aids in the marine industry.
Typical Properties
Low Density Polyethylene (LDPE)
- Design versatility
- Dimensional stability
- Low cost fabrications
- Excellent electrical properties
- Machinable
- Formable
- Maintenance free
- Good light stability
- Unusually lightweight
- High impact resistance
- Weldable
- Impressive colors and textures
- Wipes clean
High Density Polyethylene (HDPE)
- Abrasion resistance
- Low coefficient of friction
- Chemical resistance
- Self lubricating
- Excellent machinability
- Stress-cracking resistance
- High impact
- Water/salt water resistance
Pipe Grade Polyethylene (HMW HDPE)
- Performs in applications to 180°F (82°C)
- Resists mild acids, alkalis and solvents
- Is classified by ASTM and Plastic Pipe Institute as PE3408
- Meets NSF Standard 14 for use in potable water piping systems
- Contains carbon black for UV resistance
Physical Properties
| Test Name | ASTM Test Method | HDPE | LDPE | HDPE Pipe Grade |
| ISO Equivalent | ||||
| Density, g/cm³ | D792 | 0.955 | .910-.925 | 0.955 |
| 1183: 1987 | ||||
| Tensile Strength at Yield, PSI-MPa | D638 | 4600 | 1800-2200 | N.A. |
| 527-1 & 2: 1993 | 31.8 | 12.5-15.2 | N.A. | |
| Tensile Elongation at Yield, % | D638 | 900% | 600% | 800% |
| 527-1 & 2-1993 | ||||
| Tensile Modulus, PSI-MPa | D638 | N.A. | N.A. | 113,000 |
| 527-1 & 2: 1993 | N.A. | N.A. | 780 | |
| Flexural Strength, PSI-MPa | D790 | N.A. | N.A. | N.A. |
| 178: 1993 | N.A. | N.A. | N.A. | |
| Flexural Modulus, PSI_MPa | D790 | 200,000 | N.A. | 136,000 |
| 178: 1993 | 1380 | N.A. | 940 | |
| Izod
Impact - Notched, Ft.lb./in. @ 73°F kJ/m2@23°C |
D256 | 3 | No Break | N.A. |
| 180: 1993 | 6.3 | No Break | N.A. | |
| Heat
Deflection Temp. °F @ 66 PSI °C @ 0.45 MPa |
D648 | N.A. | 100-121 | 172 |
| 75-1 & 2: 1993 | N.A. | 37.8-49.4 | 77.8 | |
| Mean Coefficient of Linear Thermal Expansion In./In./°F | D696 | N.A. | N.A. | 6.1 x 10^-5 |
| Hardness - Rockwell R or Shore D where noted | D785 | 69 Shore D | 41-50 | 61 Shore D |
| Water Absorption , % | D570 | 0 | <.01 | 0 |
| 62: 1980 | 0 | |||
| Flamability Rating | UL-94 | N.R. | N.R. | N.R. |
| Maximum Operating Temperature | °F | 180 | 160 | 180 |
| °C | 82 | 71 | 82 | |