ISO 16000-27:2014

ISO 16000-27:2014 - Overview

ISO 16000-27:2014 specifies a direct method for determining settled fibrous dust on surfaces using adhesive tape sampling and scanning electron microscopy (SEM). The standard gives an index for the numerical concentration of fibrous structures (fibres ≥ 0.2 µm in diameter) in settled dust, and classifies detected structures into substance groups (for example chrysotile, amphibole asbestos, other inorganic fibres). It is primarily intended for indoor air investigations but can be used in some outdoor situations. Results may be reported as asbestos structures per unit area and/or assigned to one of four loading classes. Analytical sensitivity depends on examined area and can be as low as 10 structures/cm².

Key technical topics and requirements

• Sampling method: direct adhesive tape (direct transfer) sampling for settled dust on surfaces; limited by surface roughness, curvature and dust-layer thickness.
• Analytical method: evaluation by SEM with procedures for SEM adjustment and analysis included. Fibre classification can use energy-dispersive X‑ray analysis (EDXA) to distinguish substance groups.
• Size and definitions: targets fibrous structures with fibres ≥ 0.2 µm diameter; for this standard an asbestos/fibrous structure is any fibre-containing particle regardless of diameter.
• Reporting: results expressed as structures per unit area and/or four standardized loading classes.
• Sensitivity & limits: analytical sensitivity varies with examined area - minimums down to ~10 structures/cm² are achievable. Detection limit, measurement uncertainty and sample-related deviations are addressed.
• Scope & constraints: assumes settled dust particle diameters mostly below 1 mm; if dust layer is too thick, alternate bulk/powder sampling methods are recommended.

Practical applications and users

ISO 16000-27 is used for assessing surface contamination by asbestos or other fibrous materials in contexts such as:

• Post-abatement verification after asbestos removal
• Indoor air quality and contamination investigations in buildings
• Occupational hygiene surveys and exposure risk assessments
• Forensic and environmental site assessments Typical users include industrial hygienists, asbestos consultants, laboratory analysts with SEM capability, building inspectors, and regulatory authorities requiring standardized surface contamination data.

Related standards

• ISO 16000 series (indoor air standards)
• ISO 22262-1 (bulk materials - sampling and qualitative asbestos determination)
• Complementary asbestos/air methods (e.g., ISO 10312, ISO 13794, ISO 14966) for airborne fibre measurement

Keywords: ISO 16000-27:2014, settled fibrous dust, SEM, adhesive tape sampling, asbestos structures per unit area, loading classes, analytical sensitivity, indoor air.