Overview
ISO 7148-2:2026 is an international standard developed by the International Organization for Standardization (ISO) that defines standardized test methods for evaluating the tribological behaviour of polymer-based plain bearing materials. This document is a key reference for assessing the friction and wear properties of bearing materials under controlled operating conditions, such as specific loads, sliding velocities, and temperatures, both with and without lubrication. The standard ensures that testing of polymer-based bearings is reproducible and comparable, enabling reliable analysis of metal-polymer and polymer-polymer component interactions in practical applications.
Key Topics
- Tribological Testing: The standard covers several recognized test setups-including pin-on-disc, block-on-ring, sleeve-to-sleeve, sphere-on-prism, plain bearing-on-shaft, and linear guidance systems-to simulate different real-world bearing arrangements.
- Lubrication Conditions: ISO 7148-2:2026 outlines methods for testing both dry surfaces (without lubrication) and under boundary lubricating conditions using grease, oil, or solid lubricants.
- Test Specimen Preparation: Detailed requirements ensure that material batch integrity, manufacturing methods, fiber orientation (for composites), and surface finish reflect actual use scenarios for meaningful results.
- Environmental Controls: The procedure accounts for the influence of temperature and humidity on polymer materials, critical for achieving valid test data. Moisture absorption and thermal expansion effects are specifically highlighted.
- Reporting & Repeatability: The standard ensures data consistency, stipulating the need for repeated testing in certain polymers and comprehensive reporting on test setup, conditions, and observed wear or failure modes.
Applications
- Material Selection: Enables engineers to compare tribological performance of different polymer-based bearing materials, supporting informed design decisions for plain bearings in machinery, automotive systems, industrial equipment, and more.
- Quality Assurance: Standardized testing helps manufacturers validate product performance and ensure compliance with international expectations for reliability and durability.
- Product Development: Designers use data from ISO 7148-2:2026-compliant tests to optimize combinations of polymers and lubricants for specific applications, improving bearing life and efficiency.
- Failure Analysis & Troubleshooting: By reproducing service conditions in a controlled environment, the methods in this standard aid in diagnosing wear or failure mechanisms and guide improvements.
- Research & Innovation: Academic and industrial research benefit from consistent, repeatable metrics to develop new polymer composites, coatings, or lubrication technologies for advanced bearing systems.
Related Standards
- ISO 7148-1 – Plain bearings - Testing of the tribological behaviour of bearing materials - Part 1: Testing of metallic bearing materials.
- ISO 4378-2 – Plain bearings - Terms, definitions, classification and symbols - Part 2: Friction and wear.
- ISO 4378-3 – Plain bearings - Terms, definitions, classification and symbols - Part 3: Lubrication.
- ISO 6691 – Thermoplastic polymers for plain bearings - Classification and designation.
- ISO 4385 – Plain bearings - Compression testing of bearing materials.
Practical Value
Implementing ISO 7148-2:2026 enhances the assurance of bearing material performance in critical applications. This standard forms a foundation for material benchmarking, regulatory compliance, and innovation, elevating the global reliability and safety of polymer-based plain bearing solutions. Organizations benefit from harmonized reporting, robust quality control, and risk reduction throughout the bearing material lifecycle-from development to end-use.
By adhering to these test procedures, manufacturers and end users can base engineering and procurement decisions on objective, reliable tribological test data, fostering both cross-industry compatibility and technological advancement in plain bearing applications.
Open preview (PDF)Plain bearings — Testing of the tribological behaviour of bearing materials — Part 2: Testing of polymer-based bearing materials