ISO 11125-9:2021

Overview - ISO 11125-9:2021 (Wear testing and performance)

ISO 11125-9:2021 defines laboratory test methods for assessing the service life and cleaning performance of metallic blast-cleaning abrasives. It applies to virgin metallic blasting media in the delivery state, tested by centrifugal blasting under controlled laboratory conditions. The standard complements other parts of the ISO 11125 series and helps users quantify abrasive wear, consumption and the ability of media to transmit kinetic energy to a substrate.

Key topics and technical requirements

• Three wear-test procedures: the standard specifies the 100% breakdown method, full wear test (100% replacement) and stabilized consumption test to measure abrasive service life under repeated impacts.
• Transmitted energy tests: methods to evaluate the abrasive’s ability to deliver kinetic energy to the substrate, including tests at 100% replacement and full saturation using Almen strips and saturation curves.
• Preliminary testing prerequisites: samples must be characterised for particle size distribution, hardness, apparent density, defects/microstructure, foreign matter and moisture in accordance with other ISO 11125 parts before lab wear testing.
• Apparatus and calibration: describes required equipment (abrasive service-life testing machine, balance accurate to 0.1 g, test sieves and Almen fixtures) and stresses that machine design and settings affect results - calibration per manufacturer guidance is required.
• Metrics and definitions: introduces terms such as service life, abrasive consumption (expressed relative to material thrown), Almen intensity, saturation and transmitted energy to support consistent reporting.
• Test reporting: procedures and data to include in a test report for reproducibility and comparison.

Practical applications and users

ISO 11125-9 is used for:

• Abrasive manufacturers - product development, quality control and batch conformity testing.
• Testing laboratories - standardised comparative evaluation of metallic blasting media.
• Surface-preparation specifiers and contractors - selecting abrasives that meet performance and consumption requirements for steel surface preparation.
• Procurement and quality assurance - setting acceptance criteria in contracts for blast-cleaning media used in corrosion protection and painting applications.
• R&D teams - investigating relationships between abrasive properties (size, hardness, shape) and wear/cleaning performance.

Related standards

Key referenced documents in the ISO 11125 series and related standards:

• ISO 11124-3, -4, -5 (specifications for various metallic blast-cleaning abrasives)
• ISO 11125-1 to -7 (sampling and test methods: size, hardness, density, defects, moisture)
• ISO 12944-4 (surface preparation for corrosion protection)
• ISO 565 (test sieves)

Using ISO 11125-9:2021 helps ensure consistent, comparable lab evaluation of metallic blasting media for efficient and reliable surface preparation.