⚠️ Asbestos in building materials

Environmental ISO 22262-1

Overview

STATUS (as of 06.11.2026). ISO 22262-1:2012 — first edition, published on 29.06.2012; current in the ISO catalogue, after a completed periodical review (stage 90.60). It has not been adopted into the Polish Standards collection — the PKN search did not respond on the day of checking, so this statement comes from the earlier description and needs confirmation. Part 2 of the series — quantitative determination by gravimetric and microscopical methods — has had a second edition, ISO 22262-2:2026, since January 2026.

SCOPE (clause 1). The standard specifies methods for sampling bulk materials and identifying asbestos in commercial bulk materials, the sample preparation and a detailed procedure for identifying asbestos by polarized light microscopy (PLM) with dispersion staining. It also specifies simple procedures for separating asbestos fibres from matrix materials such as asphalt, cement and plastics products. Identification can also be carried out by scanning (SEM) or transmission (TEM) electron microscopy with energy-dispersive X-ray analysis. The standard applies to the qualitative identification of asbestos in specific types of manufactured products and commercial minerals — e.g. fireproofing and thermal insulation from which fibres can readily be separated from the matrix. It is intended for microscopists familiar with PLM and does not teach the fundamental analytical techniques.

ASBESTOS IN PRODUCTS (introduction of the standard). Chrysotile accounted for approximately 95 % of asbestos consumption; amosite and crocidolite for almost all the rest. Asbestos was added e.g. to asbestos-cement products (sheets, pipes), fireproofing, thermal and acoustic insulation, decorative plasters and coatings, glues, sealants, floor tiles and gaskets. The asbestos mass fraction approached 100 % in some products and was often 1–15 % in others; there are no known materials in which asbestos was intentionally added at less than 0.1 %. The standard therefore classifies a sample as containing asbestos (above 0.1 %) when chrysotile, amosite, crocidolite or anthophyllite is detected. Tremolite, actinolite and richterite/winchite usually result from natural contamination of constituents — their detection does not mean that the asbestos fraction exceeds 0.1 %. A visual estimate of the fraction is optional in the standard and very approximate; quantitative determination is covered by other parts of the ISO 22262 series.

WHAT THE STANDARD CONTAINS (table of contents). Clause 4 — principle, range and limit of detection, limitations of PLM; 5 — sample collection; 6 — preparation (removal of organic materials by ashing, removal of soluble constituents by acid treatment, sedimentation and flotation); 7 — PLM analysis; 8 — SEM; 9 — TEM; 10 — test report; normative annexes: A (types of commercial asbestos-containing materials), B (interference colour chart), C (dispersion staining charts), D–F (identification by PLM, SEM and TEM).

SECOND SOURCE — HSE ANALYSTS' GUIDE (HSG248, 2021). Sequence of identification: examination of the whole sample (each layer separately), a thorough search under a stereo-microscope, sample treatment to release fibres if needed, mounting of selected fibres in a liquid of known refractive index chosen for the expected asbestos type, and PLM identification at magnifications from about 80×; if no asbestos is found — an additional search of random sub-samples at 80–500×. Difficulties arise with fibres below about 1 µm in width and in distinguishing tremolite, actinolite and anthophyllite — electron microscopy with EDX helps there.

REGULATIONS (Poland). Asbestos-containing products may be used in a way that does not create a hazard until 31 December 2032, and installations and equipment containing asbestos are to be cleaned by the same date; the regulation also sets out how these products are inventoried (Dz.U. 2011 No 8 item 31, § 1–3). The owner or manager inspects the condition of the products and draws up an "Assessment of the condition and possibility of safe use of asbestos-containing products" (Dz.U. 2004 No 71 item 649, § 4). The maximum admissible concentration (NDS) of asbestos in workplace air is 0.01 or 0.002 respirable fibres per cm³ depending on the fibre width counted, with 0.01 applying until 20 December 2029 (Dz.U. 2026 item 447: list item 32, footnotes 11–12, § 2(6)) — this concerns air measurements, not this standard.

WHAT WE DO NOT GIVE HERE. The content of clauses 4–10 and the annexes of the standard (limit of detection, details of sampling and preparation, identification criteria for PLM, SEM and TEM) — the available text ends with the definitions. Analysis times, sample masses and reagent concentrations — the sources do not give them.

Method principle

Fibres isolated from the sample (after examination and a search under a stereo-microscope, if needed after ashing, acid treatment or sedimentation) are mounted in a liquid of known refractive index and identified in a polarizing microscope on the basis of their optical properties — refractive indices, birefringence, interference colours, extinction angle, sign of elongation and dispersion staining colours. Where fibres are too fine or too closely bound to the matrix, identification is confirmed by electron microscopy (SEM or TEM) with EDX analysis.

Applications

• Qualitative identification of asbestos in commercial bulk materials (scope of the standard, clause 1)
• Fireproofing, thermal insulation and other products from which fibres can readily be separated from the matrix (clause 1)
• Asbestos-cement, asphalt and plastics products — with separation of fibres from the matrix (clause 1, clause 6)
• Sampling of bulk materials (clause 5)
• Testing of products for the inventory and condition assessment of asbestos-containing products (Poland: Dz.U. 2011 No 8 item 31; Dz.U. 2004 No 71 item 649)
• Recognition of the six regulated varieties: chrysotile, amosite, crocidolite, anthophyllite, tremolite and actinolite

Key parameters

Standard

Standard number

ISO 22262-1:2012 — INTERNATIONAL standard, not adopted into the PN collection

Title (PL)

Jakość powietrza — Materiały w masie — Część 1: Pobieranie próbek i jakościowe oznaczanie azbestu w handlowych materiałach w masie (tłumaczenie robocze — normy nie wprowadzono do PN)

Title (EN)

Air quality — Bulk materials — Part 1: Sampling and qualitative determination of asbestos in commercial bulk materials

Step-by-step procedure

1. Sampling

   Collect the material sample in accordance with clause 5 of the standard (requirements and sampling procedure); an example sampling record is given in Annex G.

2. Opening and examination

   Open the packaging only in a fume cupboard or cabinet; examine the whole sample, describe it as homogeneous or non-homogeneous and each layer separately (HSG248, A2.7–A2.8).

3. Stereo-microscope search

   Search the sample thoroughly, isolate fibres and tentatively classify them by appearance and handling properties (HSG248, A2.7).

4. Sample preparation

   If needed, release the fibres: ashing of organic material, removal of soluble constituents by acid, sedimentation or flotation (clause 6).

5. PLM mount

   Mount a few fibres of each suspected type in a liquid with a refractive index chosen for the expected asbestos (HSG248, A2.7, Table A2.3).

6. PLM identification

   Assess morphology, colour and pleochroism, refractive indices, birefringence and interference colours, extinction angle, sign of elongation and dispersion colours (clause 7, Annexes B–D; HSG248).

7. If no asbestos is found

   Additionally search random sub-samples at 80–500×, and for materials with very fine fibres or a strongly bound matrix consider SEM or TEM (HSG248, A2.7; introduction of the standard).

8. SEM or TEM confirmation

   If needed, identify the fibres by electron microscopy with EDX in accordance with clauses 8–9 and Annexes E–F.

9. Report

   Report the result in accordance with clause 10 (example in Annex H): the type of asbestos detected, or that none was detected, for each layer.

Required equipment and apparatus

Reagents, media and consumables

Health and safety (OHS)

• Asbestos — harmonised CLP classification: H350 (may cause cancer) and H372 (causes damage to organs through prolonged or repeated exposure)
• Sealed samples are opened, examined and prepared only in a fume cupboard or cabinet meeting the requirements (HSG248, A2.8–A2.9)
• Periodic monitoring of analysts' exposure in the sample preparation area; emergency procedures for spills (HSG248, A2.8)
• Asbestos-contaminated waste in heavy-duty labelled bags; cabinet filters are changed by a trained person following a procedure (HSG248, A2.8, A2.10)
• Work on securing and removing asbestos-containing products — requirements for the contractor, including training of workers, are set by § 6 of Dz.U. 2004 No 71 item 649 (Poland)

Frequently asked questions