ISO 7148-2:2012 PDF

Plain bearings — Testing of the tribological behaviour of bearing materials — Part 2: Testing of polymer-based bearing materials

Open preview (PDF)

Title (English):

ISO 7148-2:2012

Plain bearings — Testing of the tribological behaviour of bearing materials — Part 2: Testing of polymer-based bearing materials

Document status:: Withdrawn
Format:: Electronic (PDF)
Number of pages:: 29
Publication date:: October 1, 2012
Edition:: ISO IS 7148 edition 2 version 1
ICS:: 21.100.10

Delivery type:

Full version25 €Read online 24h10 €Read online 72h15 €

Document language:

enru

Delivery time:Immediate download

Price:25 €

Description (English):

This part of ISO 7148 specifies tribological tests of polymer-based plain bearing materials under specified working conditions, i.e. load, sliding velocity and temperature, with and without lubrication. From the test results, data are obtained which indicate the relative tribological behaviour of metal-polymer and polymer-polymer rubbing parts. The purpose of this part of ISO 7148 is to obtain, for polymer material combinations used in plain bearings, reproducible measured values for friction and wear under specified and exactly-defined test conditions without lubrication (dry surfaces) and with lubrication (boundary lubrication). The test results give useful information for practical application only if all parameters of influence are identical. The more the test conditions deviate from the actual application, the greater the uncertainty of the applicability of the results.

Technical details

Technical committee: ISO/TC 123/SC 2 - Materials and lubricants, their properties, characteristics, test methods and testing conditions
SKU: ISO 7148-2:2012

Abstract

Overview

ISO 7148-2:2012 - Plain bearings: Testing of the tribological behaviour of bearing materials - Part 2: Testing of polymer-based bearing materials - defines standardized tribological test methods to assess the friction and wear behaviour of polymer-based plain bearing materials under specified working conditions (load, sliding velocity, temperature), both with and without lubrication. The standard produces reproducible data for comparing metal–polymer and polymer–polymer rubbing pairs and emphasizes that test results are meaningful only when test parameters match the intended application.

Key topics and technical requirements

Scope and purpose
- Reproducible measurement of friction and wear for polymer-bearing combinations in well-defined test conditions (dry and boundary-lubricated).
- Emphasis on matching test conditions to real-world application to reduce uncertainty.
Test methods
- Five model geometries are specified: A - Pin-on-disc, B - Block (or pin)-on-ring, C - Plain bearing-on-shaft, D - Sphere-on-prism, E - Rotation under thrust load. Choice depends on which geometry best simulates the practical contact.
Specimen preparation and conditioning
- Requirements for specimen dimensions, surface condition (machined vs injection-moulded), fibre orientation, and conditioning (moisture, storage, cleaning).
Environmental and operational control
- Controlled parameters include load, sliding velocity, temperature, and lubrication state (dry, grease, oil, solid lubricant). Temperature control is critical due to polymers’ low thermal conductivity and high thermal expansion.
Analysis and reporting
- Measurement of coefficient of friction, linear and volumetric wear rates, friction moment and specimen temperature. Annex A provides a model test report structure.
Special considerations for polymers
- Effects of glass transition temperature, thermal expansion, transfer layers, anisotropy from reinforcements, moisture absorption (e.g., polyamides), and potential poor repeatability requiring multiple repetitions.

Practical applications and users

ISO 7148-2 is used by:

Bearing and material manufacturers for material selection and ranking of polymer bearing materials.
Tribologists and test laboratories for standardized comparative testing of friction and wear.
R&D and quality engineers in automotive, aerospace, industrial machinery, and consumer products for validating polymer bearing performance in design conditions.
OEMs specifying bearing materials and acceptance testing criteria.

Benefits:

Enables consistent comparison of materials and mating pairs.
Supports design decisions, life‑expectancy estimates and lubrication strategy (dry vs boundary-lubricated).

Related standards

ISO 7148-1: Testing of bearing metals (companion part)
Normative references used in ISO 7148-2: ISO 527-2 / ISO 527-3 (plastics tensile testing), ISO 2818 (specimen machining), ISO 6691 (thermoplastic classification), among others.

Keywords: ISO 7148-2, plain bearings, polymer-based bearing materials, tribological testing, friction and wear, pin-on-disc, block-on-ring, plain bearing-on-shaft, boundary lubrication, test methods.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Scope and purpose
- Reproducible measurement of friction and wear for polymer-bearing combinations in well-defined test conditions (dry and boundary-lubricated).
- Emphasis on matching test conditions to real-world application to reduce uncertainty.
Test methods
- Five model geometries are specified: A - Pin-on-disc, B - Block (or pin)-on-ring, C - Plain bearing-on-shaft, D - Sphere-on-prism, E - Rotation under thrust load. Choice depends on which geometry best simulates the practical contact.
Specimen preparation and conditioning
- Requirements for specimen dimensions, surface condition (machined vs injection-moulded), fibre orientation, and conditioning (moisture, storage, cleaning).
Environmental and operational control
- Controlled parameters include load, sliding velocity, temperature, and lubrication state (dry, grease, oil, solid lubricant). Temperature control is critical due to polymers’ low thermal conductivity and high thermal expansion.
Analysis and reporting
- Measurement of coefficient of friction, linear and volumetric wear rates, friction moment and specimen temperature. Annex A provides a model test report structure.
Special considerations for polymers
- Effects of glass transition temperature, thermal expansion, transfer layers, anisotropy from reinforcements, moisture absorption (e.g., polyamides), and potential poor repeatability requiring multiple repetitions.

Practical applications and users

ISO 7148-2 is used by:

Bearing and material manufacturers for material selection and ranking of polymer bearing materials.
Tribologists and test laboratories for standardized comparative testing of friction and wear.
R&D and quality engineers in automotive, aerospace, industrial machinery, and consumer products for validating polymer bearing performance in design conditions.
OEMs specifying bearing materials and acceptance testing criteria.

Benefits:

Enables consistent comparison of materials and mating pairs.
Supports design decisions, life‑expectancy estimates and lubrication strategy (dry vs boundary-lubricated).

Related standards

ISO 7148-1: Testing of bearing metals (companion part)
Normative references used in ISO 7148-2: ISO 527-2 / ISO 527-3 (plastics tensile testing), ISO 2818 (specimen machining), ISO 6691 (thermoplastic classification), among others.

Keywords: ISO 7148-2, plain bearings, polymer-based bearing materials, tribological testing, friction and wear, pin-on-disc, block-on-ring, plain bearing-on-shaft, boundary lubrication, test methods.

ISO 7148-2:2012 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Related standards

Plain bearings - Testing of the tribological behaviour of bearing materials - Part 2: Testing of polymer-base…

Plain bearings - Testing of the tribological behaviour of bearing materials - Part 1: Testing of bearing meta…

Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics…

Plastics - Determination of tensile properties - Part 3: Test conditions for films and sheets (ISO 527-3:2018)

Plastics - Preparation of test specimens by machining (ISO 2818:2018)

Thermoplastic polymers for plain bearings - Classification and designation