Lab workflow
From a suspect material to a UKAS-signed identification certificate.
This is the exact chain-of-custody workflow ISO/IEC 17025 UKAS-accredited laboratories follow for bulk asbestos identification. Understanding it protects you from the low-cost operators who skip steps.
Overview
Why this exists.
A bulk sample is only as trustworthy as its chain of custody. If the sampler cannot show sealed containment, unique labelling and a documented handover to a UKAS 17025 lab, the certificate is legally worthless.
The workflow below is the standard we follow on every job — whether it is a single kitchen tile for a homeowner or 400 samples on a schools framework. Nothing is skipped for smaller jobs.
The explainer
Bulk sampling workflow
- Step 1
1. Pre-sample brief
Written scope, access permits, PPE, RPE selection, sampling method statement.
- Step 2
2. Prepare area
Isolate, damp down, drop-sheet, PPE donned, hand-tool wetted.
- Step 3
3. Take sample
Minimum viable mass, into sealed double bag, unique reference.
- Step 4
4. Encapsulate scar
PVA or epoxy seal, photographed and logged.
- Step 5
5. Chain of custody
Signed handover to courier or in-house transport with tamper-evident seal.
- Step 6
6. Lab intake
UKAS 17025 sample-reception log, weight, condition, chain confirmed.
- Step 7
7. PLM analysis
Polarised light microscopy with dispersion staining by a named accredited analyst.
- Step 8
8. Second-check
Independent verification for any borderline result — mandated by the schedule.
- Step 9
9. Certificate
Signed PDF with UKAS logo, schedule item, analyst name, date, retained for 40 years.
- Step 10
10. Register update
Result issued into your asbestos register with photograph and location.
How to read this
- Follow the steps top-to-bottom. Amber steps are UKAS 17025 accredited activities.
- Red steps are the fail-points where non-accredited providers cut corners.
Key takeaways
PLM + dispersion staining
The reference method for UK bulk identification. Anything else is a screening test, not identification.
Named analyst
Every certificate names the accredited analyst and the accreditation schedule item.
Chain of custody
Sample bag → sealed transport tub → lab intake log → analyst → signed certificate. No gaps.
FAQs
Common follow-up questions.
How much material is needed?
Roughly a 10 mm cube of solid material or a matchbox-sized fragment of insulation is sufficient for PLM identification.
Can I take my own sample?
You can — but the certificate must still come from a UKAS 17025 lab, and a poorly-taken sample can invalidate the result. Almost always cheaper to use a competent sampler.
Explore further
Related guidance
Guide
Bulk Sample Analysis
How UKAS 17025 laboratories analyse bulk samples using polarised light microscopy to identify the fibre type and confirm presence.
ReadStandard
ISO/IEC 17025 (UKAS) (ISO/IEC 17025)
The international standard for asbestos testing laboratory accreditation — chain of custody, PLM identification, PCM fibre counting and TEM confirmation.
ReadGuide
Asbestos Sampling
Targeted bulk sampling of one or more suspect materials by an accredited surveyor — costs, turnaround and reading the result.
ReadGuide
Sample a Single Material or Commission a Full Survey?
Bulk sampling costs less than a full survey. It also answers a much narrower question. This guide sets out when each is appropriate.
ReadStandard
ISO/IEC 17020 (UKAS) (ISO/IEC 17020)
The international standard against which asbestos surveying bodies are accredited by UKAS. Impartiality, competence, method control and audit trail requirements.
ReadGuide
Asbestos Identification Guide
A practical UK guide to identifying asbestos containing materials by appearance, location and building age — and when only laboratory analysis can confirm it.
Read