Polyethylenes offer excellent chemical resistance. good fatigue. wear and moisture resistance. Differences in the length of the polymer chain yields a wide range of properties. Polyethylenes are easy to distinguish from other plastics because they float in water.
Representing the largest portion of the polyethylene applications. HDPE offers excellent impact resistance. lightweight. low moisture absorption. and high tensile strength. These physical properties in addition to its ability to be easily machined. thermoformed. and welded have led to the wide use of HDPE on food processing. packaging. and conveying equipment. HDPE is also non-toxic and non-staining and is often chosen because of its FDA approval and food contact suitability and its excellent machinability.
HDPE is actually a very popular engineering plastic and is sometimes confused with other similar materials. HDPE comes in several different grades. which delineate the purposes that the HDPE is best suited for. Normally available in two grades. 300 grade and 500 grade. the higher number denotes the density of the material and can improve on performance. The majority of HDPE is available in either black or white although 500 grade sheet is available in a range of colors. which can sometimes help with food preparation or process identification.
Emco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative by filling out the form below.
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High Density Polyethylene, Natural
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| Type | Size | Length | Color |
|---|---|---|---|
| Sheet | 1/4” – 3/4” | 48” x 96”, 60″x96″ CTS | White, Black, Colors |
| Other | Playground Systems, Partition Board |
Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.
| Physical Properties | Units | ASTM | Results |
|---|---|---|---|
| Density | g/cm^3 | D792 | 29.4 – 28.7 |
| Water Absorption. 24 hrs | % | D570 | <0.01 |
| Mechanical Properties | Units | ASTM | Results |
|---|---|---|---|
| Flexural Modulus | psi | D790 | 400000 |
| Hardness, Shore D | D785 | D69 | |
| Tensile Elongation @Break | % | D638 | 20 – 1.000 |
| IZOD Impact Strength Notched | ft-lb/in | D256 | 3 |
| Thermal Properties | Units | ASTM | Results |
|---|---|---|---|
| Coeffcient of Linear Thermal Expansion | (x 10^-5 in./in./°F) | D256 | 6.1 – 7.2 |
| Heat Deflection Temp at 66 psi | °F | D648 | 140 – 190 |
| Heat Deflection Temp at 264 psi | °F | 110 – 130 | |
| Melting Temperature | °F | D3418 | 260 |
| Max Operating Temp | °F | 180 | |
| Thermal Conductivity | BTU-in/ft2-hr-°F | C177 | 11.0 – 12.4 |
| Electrical Properties | Units | ASTM | Results |
|---|---|---|---|
| Dielectric Strength | V/mil | D149 | 450 – 500 |
| Dielectric Constant | D150 | 2.30 – 2.35@1 kHz | |
| Dissipation Factor | D150 | 0.0003 @1 khz | |
| Volume Resistivity. 50% RH | ohm-cm | D257 | 10^5 |
| Arc Resistance | sec | D495 | 200 – 250 |
| Optical Properties | Units | ASTM | Results |
|---|---|---|---|
| 3mm Transparent Clear Transmittance. Total (%) | % | D1003 | 1.54 |
| Refractive Index | % | D542 | 18537 |
NOTE: The property values presented above are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers’ complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.
NOTE: Several grades of this material are available. For additional information regarding this plastic, contact your Emco Industrial Plastics representative or call 973-435-8544.