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Sulphuric Acid on the WebTM Technical Manual DKL Engineering, Inc.

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Sulphuric Acid on the Web

Introduction
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Materials of Construction
Corrosion
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Handbook of Sulphuric Acid Manufacturing
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Preface
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Sulphuric Acid Decolourization
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Preface
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Process Engineering Data Sheets - PEDS
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Introduction

Bibliography of Sulphuric Acid Technology
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Preface
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Sulphuric Acid Plant Specifications
 

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Materials of Construction - UHMWPE
March 13, 2003


Common Name UHMWPE
Chemical Name Ultra High Molecular Weight Polyethylene
Trade Names RCH 1000 (Hoechst’s early trade name for UHMWPE)
Hostalen GUR 1020 (Type 1) (manufactured by Hoechst/Ticona, Inc.)
Hostalen GUR 1050 (Type 2) (manufactured by Hoechst/Ticona, Inc.)
1900H (Type 3) (previously manufactured by Basell Polyolefins, now discontinued)
General Ultra-high molecular weight polyethylene (UHMWPE) is a unique polymer with outstanding physical and mechanical properties. For the past 40 years, UHMWPE has been used in orthopedics as a bearing material in artificial joints. Each year, about 1.4 million joint replacement procedures are performed around the world. Despite the success of these restorative procedures, UHMWPE implants have only a finite lifetime. Wear and damage of the UHMWPE components is one of the factors limiting implant longevity.

UHMWPE comes from a family of polymers with a deceptively simple chemical composition, consisting of only hydrogen and carbon. However, the simplicity inherent its chemical composition belies a more complex hierarchy of organizational structures at the molecular and supermolecular length scales. At a molecular level, the carbon backbone of polyethylene can twist, rotate, and fold into ordered crystalline regions. At a supermolecular level, the UHMWPE consists of powder (also known as resin or flake) that must be consolidated at elevated temperatures and pressures to form a bulk material. Further layers of complexity are introduced by chemical changes that arise in UHMWPE due to radiation sterilization and processing.

Specifications

ASTM D4020 Standard Specification for Ultra-High-Molecular-Weight Polyethylene Molding and Extrusion Materials

ISO 11542-1 gives a range of viscosity numbers that defines the viscosity of UHMW-PE grades. The viscosity numbers are determined in accordance with ISO 1628-3.

Application

General

  • Bearing material in artificial joints

Sulphuric Acid Plants

  • Weak acid pumps (i.e. Wernert)