ASTM F1854-15 PDF

Full title and description

ASTM F1854-15 — Standard Test Method for Stereological Evaluation of Porous Coatings on Medical Implants. This test method defines stereological approaches for quantifying morphological features of porous coatings bonded to nonporous substrates, including coating thickness, volume percent void (porosity) and mean intercept length, and outlines procedures for measuring these properties at distinct levels through the coating (tissue‑interface gradients).

Abstract

Provides stereological procedures suitable for elementary quantification and comparative evaluation of porous implant coatings using microscopy (digital images). The standard describes how to sample image fields, measure mean coating thickness, estimate volume percent void and calculate mean intercept length, and notes limitations related to image resolution and coatings with small mean thickness or large thickness variability. SI units are specified as the standard units.

General information

• Status: Withdrawn / superseded — replaced by ASTM F1854-25 (Standard Test Method for Stereological Evaluation of Porous Coatings on Medical Implants Using Digital Images).
• Publication date: 15 March 2015 (designation F1854-15).
• Publisher: ASTM International (original publisher).
• ICS / categories: 11.040.40 (Implants for surgery, prosthetics and orthotics).
• Edition / version: F1854-15 (2015); later revised and issued as F1854-25.
• Number of pages: 10 pages (original 2015 text).

Scope

The test method covers stereological techniques to characterize porous coatings either in bulk form or adhering to nonporous substrates, providing methods to determine coating thickness, void content (volume percent void), and mean intercept length. It also outlines a procedure to measure void content and intercept length at distinct levels through the porous thickness (tissue‑interface gradients). The standard specifies SI units and notes that results depend on image resolution, field size, number of fields and grid spacing.

Key topics and requirements

• Stereological measurement methods for porous coatings (systematic sampling of image fields and application of stereological grids).
• Determination of mean coating thickness and statistical considerations for field sampling.
• Estimation of volume percent void (porosity) and calculation of mean intercept length.
• Procedure for measuring properties at discrete levels through the coating (tissue‑interface gradients).
• Requirements and recommendations on image resolution, field size, number of fields and grid spacing to achieve acceptable accuracy; limitations noted for very thin coatings or coatings with high thickness variability.
• Use of SI units as standard and caution about safety/regulatory considerations when applying the method.

Typical use and users

Used by medical implant manufacturers, materials and metallography laboratories, quality control and R&D teams in biomedical device development, independent testing laboratories, and regulatory/technical reviewers to quantify and compare porous coating morphology and to support process or lot control. The method is primarily applied where microscopy and image analysis are available and where comparative or statistical estimates of coating morphology are required.

Related standards

Historically part of the ASTM F1854 series (earlier revisions include F1854‑09, F1854‑01, etc.). The 2015 revision (F1854‑15) was later superseded by a 2025 revision (F1854‑25) that emphasizes evaluation using digital images. Other ASTM standards in the implant/coating/metallography space reference or are cross‑referenced with F1854 in various editions.

Keywords

porous coatings; stereology; porosity; coating thickness; mean intercept length; tissue‑interface gradient; metallography; medical implants.

FAQ

Q: What is this standard?

A: ASTM F1854-15 is a 2015 ASTM test method that specifies stereological procedures for quantifying morphological features of porous coatings on medical implants, including thickness, void content and mean intercept length.

Q: What does it cover?

A: It covers stereological sampling and measurement techniques using microscopy (digital images) to determine coating thickness, percent void (porosity), mean intercept length and procedures for measuring these parameters at different levels through the coating (tissue‑interface gradients), with guidance on image resolution and sampling to achieve reliable estimates.

Q: Who typically uses it?

A: Implant manufacturers, materials/metallography labs, independent test labs, product development and quality teams, and reviewers involved in device characterization and comparative evaluations of porous coatings.

Q: Is it current or superseded?

A: The F1854-15 edition (2015) has been superseded — the method was updated and reissued as ASTM F1854-25; F1854-15 is shown as withdrawn/replaced in subsequent listings. Users should consult the current F1854-25 text for the latest procedures and requirements.

Q: Is it part of a series?

A: Yes — F1854 is a series of revisions (F1854-98, F1854-01, F1854-09, F1854-15, and the later F1854-25) addressing stereological evaluation of porous coatings; revisions update methods and clarify use with modern imaging practices.

Q: What are the key keywords?

A: Porous coatings, stereology, porosity, coating thickness, mean intercept length, metallography, tissue‑interface gradient, medical implants.