ASTM G99-23 PDF

Full title and description

ASTM G99-23 — Standard Test Method for Wear and Friction Testing with a Pin-on-Disk or Ball-on-Disk Apparatus. This test method defines laboratory procedures, apparatus configurations, specimen geometries, and measurement/reporting conventions for determining sliding wear and coefficient of friction using pin-on-disk or ball-on-disk tribometers under nominally non‑abrasive conditions.

Abstract

ASTM G99-23 specifies a controlled laboratory technique to evaluate sliding wear and friction between material pairs using pin-on-disk or ball-on-disk arrangements. The standard describes apparatus alignment, specimen preparation, test parameter selection (load, speed, sliding distance), data acquisition (wear volume or mass loss, friction trace), data reduction, and reporting requirements. It also notes limitations of the method for directly predicting in‑service wear because of the simplified contact geometry and test environment.

General information

• Status: Published / Active.
• Publication date: Approved and published November 1, 2023 (often listed as 01/11/2023).
• Publisher: ASTM International.
• ICS / categories: Surface properties; wear and friction testing — ICS 17.040.20 (Properties of surfaces).
• Edition / version: Designation G99 − 23 (current 2023 edition).
• Number of pages: Short form (approximately 5–6 pages, published as a concise test method).

Scope

This standard covers a laboratory procedure for assessing wear and friction during sliding contact using pin-on-disk or ball-on-disk apparatus. It applies to tests of material pairs in nominally non‑abrasive sliding, provides guidance on machine and specimen alignment, describes measurement of wear (mass loss, wear track geometry or volume) and coefficient of friction, and prescribes minimum reporting information so results can be compared or reproduced. The method is intended for relative ranking and comparison rather than absolute prediction of field performance.

Key topics and requirements

• Apparatus configuration and alignment requirements for pin-on-disk and ball-on-disk arrangements.
• Specimen sizing, preparation, mounting, and material-pair selection.
• Test parameter specification: normal load, sliding speed, track radius, sliding distance or duration, temperature, and environment (ambient, controlled, or lubricated).
• Data acquisition and reduction: friction coefficient trace, mass loss or wear volume calculation, wear rate normalization (e.g., mm3/N·m), and uncertainty considerations.
• Reporting requirements: full description of tribosystem, test conditions, measurement methods, and any deviations from the standard procedure.
• Limitations and applicability statements explaining that results are comparative and dependent on selected test parameters.

Typical use and users

Used by tribology and materials laboratories, coating and surface‑engineering groups, quality assurance and R&D teams in industry, academic researchers, and third‑party testing services to compare materials, evaluate coatings, study counterface behavior, and screen candidate materials under controlled sliding conditions. It is frequently applied for comparative ranking of metals, ceramics, polymers, and coated systems before more application‑specific testing.

Related standards

ASTM G99-23 is part of the ASTM G committee family addressing wear and erosion. Commonly referenced or complementary documents include guides for measuring and reporting friction coefficients (ASTM G115) and other tribological test methods such as reciprocating or linearly reciprocating ball/flat tests (for example, ASTM G133 and related practices). Where friction coefficient reporting or inter-laboratory comparability is important, users often apply G115 in conjunction with G99.

Keywords

pin-on-disk; ball-on-disk; wear testing; friction coefficient; sliding wear; tribometer; wear rate; ASTM G99; pin-on-disk apparatus; ball-on-disk apparatus.

FAQ

Q: What is this standard?

A: ASTM G99-23 is the 2023 edition of the ASTM standard test method that describes how to perform wear and friction tests using pin-on-disk or ball-on-disk apparatus to measure sliding wear and coefficient of friction between material pairs.

Q: What does it cover?

A: It covers apparatus setup and alignment, specimen preparation, selection of test parameters (load, speed, sliding distance), data collection (mass loss, wear volume, friction trace), data reduction, and reporting conventions. It emphasizes comparative testing under controlled laboratory conditions and lists the method’s limitations for direct field-service prediction.

Q: Who typically uses it?

A: Tribologists, materials scientists, coating developers, R&D and QA labs, and independent test houses use the method to screen materials, rank couples, evaluate coatings, and generate reproducible comparative wear and friction data.

Q: Is it current or superseded?

A: The designation G99 − 23 indicates the 2023 approved edition (current as of its November 1, 2023 approval/publication). It replaces earlier editions (for example, G99‑17). Users should verify they are using the latest available edition for compliance.

Q: Is it part of a series?

A: Yes. G99-23 is part of the ASTM Committee G02 suite of standards addressing wear and erosion. It is commonly used together with related guides and test methods (for example, G115 for friction reporting and other wear test methods such as linearly reciprocating tests) depending on application needs.

Q: What are the key keywords?

A: Pin-on-disk, ball-on-disk, sliding wear, friction coefficient, wear rate, tribometer, specimen preparation, comparative wear testing.