UHMWPE (Ultra-High Molecular Weight PE)

Extremely tough polymer with highest impact strength of any thermoplastic.

Core Principles & Analysis

• Chain molecular weights of 3.5-7.5 million g/mol mean the melt barely flows, so stock is compression molded or ram extruded, then machined.
• Gel-spun UHMWPE fibers such as Dyneema and Spectra are up to 15 times stronger than steel by weight and light enough to float.
• Radiation-crosslinked UHMWPE is the bearing surface articulating against the metal or ceramic head in most hip and knee replacements.

Specifications & Metrics

• DENSITY: 0.93 g/cm³
• YIELD STRENGTH: 21 MPa
• HARDNESS: 62 Shore D