HDPE – High Density Polyethylene
Polyethylene is a widely used, inexpensive, thermoplastic. It has good inherent lubricity, and is easy to process. Polyethylene has good to excellent chemical resistance. It is also soft and cannot be used in temperatures much above 150. As a family, they are light in weight and possess toughness, chemical resistance, impermeability as well as excellent electrical insulating properties. High density polyethylene is the hardest and stiffest version of this material. It does not have the impact strength of low density, but is more resilient.
Applications: Consumer products, houseware items, electronic wire/cable insulators and medical products
| Tensile Strength | Flexural Modulus | Impact Strength | Max Temp. | Chemical Resistance |
|---|---|---|---|---|
| 3,200-4,500 psi | 145,000-225,000 psi | .4-4 ft-lb/in notched izod | 130°-150° F | Good to Excellent |
Advantages
- Low cost
- Impact resistance from -40° to 194° F
- Moisture resistance
- Food grades available
Disadvantages
- Poor weather resistance
- High thermal expansion
- Subject to stress cracking
- Difficult to bond
- Flammable
- Poor temperature capability
Brand Names: Alathon, Borealis, Certene, Dow, ExxonMobil, HiFill, Marlex