ISO 6691-2021 pdf free download – Thermoplastic polymers for plain bearings — Classification and designation.
This document specifies a classification and designation system for a selection of the most commonunfilled thermoplastic polymers for plain bearings.
The unfilled thermoplastic polymers are classified on the basis of appropriate levels of distinctiveproperties, additives and information about their application for plain bearings.The designation systemdoes not include all properties; thermoplastic polymers having the same designation cannot thereforebe interchanged in all cases.
lt also provides an outline of the properties and applications of the most common unfilled thermoplasticpolymers as well as listing some of the fundamental parameters that influence the selection ofthermoplastic 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.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies. Forundated references, the latest edition of the referenced document(including any amendments) applies.
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 andextrusion plastics
ISO 527-3,Plastics —Determination of tensile properties — Part 3:Test conditions for films and sheetsISO 527-4，Plastics —Determination of tensile properties – Part 4:Test conditions for isotropic andorthotropic fibre-reinforced plastic composites
ISO 527-5, Plastics —Determination of tensile properties — Part 5: Test conditions for unidirectional fibre-reinforced plastic composites
ISO 1043-1，Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their specialcharacteristics
IS0 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR)of thermoplastics — Part 1: Standard method
ISO 1183-1,Plastics —Methods for determining the density of non-cellular plastics — Part 1: lmmersionmethod,liquid pycnometer method and titration method
ISO 1183-2，Plastics — Methods for determining the density of non-cellular plastics — Part 2: Densitygradient column method
ISO 1183-3，Plastics – Methods for determining the density of non-cellular plastics — Part 3: Gaspyknometer method
ISO 1628-5,Plastics — Determination of the viscosity of polymers in dilute solution using capillaryviscometers — Part 5: Thermoplastic polyester (TP) homopolymers and copolymers
ISO 16396-1, Plastics — Polyamide (PA) moulding and extrusion materials — Part 1: Designation system,marking of products and basis for specifications
IS0 16396-2,Plastics — Polyamide (PA) moulding and extrusion materials —Part 2: Preparation of testspecimens and determination of properties
ISO 17855-1,Plastics — Polyethylene (PE) moulding and extrusion materials—Part 1: Designation systemand basis for specifications
ISO 17855-2,Plastics — Polyethylene (PE) moulding and extrusion materials — Part 2:Preparation of testspecimens and determination of properties
ISO 20028-1，Plastics – Thermoplastic polyester (TP) moulding and extrusion materials — Part 1:Designation system and basis for specification
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:-ISO Online browsing platform: available at https://www.iso.org/obp
-IEC Electropedia: available at http://www.electropedia.org/
4 Classification and designation system
4.1General
The classification and designation are based on a block system consisting of a “description block” and“Identity block” (see ‘Table i).The “Identity block” comprises an “International Standard number block”and an “individual item block”.For unambiguous coding of all thermoplastic polymers, the “individualitem block” is subdivided into four data blocks.ISO 6691 pdf download.