ISO 6691:2021
Thermoplastic polymers for plain bearings — Classification and designation

Standard No.

ISO 6691:2021

Release Date

2021

Published By

International Organization for Standardization (ISO)

Latest

ISO 6691:2021

Scope

This document specifies a classification and designation system for a selection of the most common unfilled thermoplastic polymers for plain bearings. The unfilled thermoplastic polymers are classified on the basis of appropriate levels of distinctive properties, additives and information about their application for plain bearings. The designation system does not include all properties; thermoplastic polymers having the same designation cannot therefore be interchanged in all cases. It also provides an outline of the properties and applications of the most common unfilled thermoplastic polymers as well as listing some of the fundamental parameters that influence the selection of thermoplastic polymers for use for plain bearings. NOTE In the further course of the work, it is intended to prepare standards on “thermosetting polymers” and “mixed polymers” for plain bearings.

ISO 6691:2021 Referenced Document

• ISO 1043-1 Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special characteristics AMENDMENT 1: New symbol ST for syndiotactic
• ISO 1133-1 Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics — Part 1: Standard method*， 2022-06-23 Update
• ISO 1183-1 Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion method, liquid pycnometer method and titration method
• ISO 1183-2 Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient column method
• ISO 1183-3 Plastics - Methods for determining the density of non-cellular plastics - Part 3: Gas pyknometer method
• ISO 16396-1 Plastics — Polyamide (PA) moulding and extrusion materials — Part 1: Designation system and basis for specifications*， 2022-09-27 Update
• ISO 16396-2 Plastics — Polyamide (PA) moulding and extrusion materials — Part 2: Preparation of test specimens and determination of properties*， 2022-06-24 Update
• ISO 17855-1 Plastics - Polyethylene (PE) moulding and extrusion materials - Part 1: Designation system and basis for specifications
• ISO 17855-2 Plastics - Polyethylene (PE) moulding and extrusion materials - Part 2: Preparation of test specimens and determination of properties
• ISO 20028-1 Plastics — Thermoplastic polyester (TP) moulding and extrusion materials — Part 1: Designation system and basis for specification
• ISO 307 Plastics — Polyamides — Determination of viscosity number
• ISO 527-1 Plastics — Determination of tensile properties — Part 1: General principles
• ISO 527-2 Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics
• ISO 527-3 Plastics — Determination of tensile properties — Part 3: Test conditions for films and sheets
• ISO 527-4 Plastics — Determination of tensile properties — Part 4: Test conditions for isotropic and orthotropic fibre-reinforced plastic composites*， 2023-03-24 Update
• ISO 527-5 Plastics — Determination of tensile properties — Part 5: Test conditions for unidirectional fibre-reinforced plastic composites*， 2021-11-24 Update

ISO 6691:2021 history

• 2021 ISO 6691:2021 Thermoplastic polymers for plain bearings — Classification and designation
• 2000 ISO 6691:2000 Thermoplastic polymers for plain bearings - Classification and designation
• 1989 ISO 6691:1989 Thermoplastics for plain bearings — Classification and designation