Inventory of Hazardous Material Service Providers

An Inventory of Hazardous Materials (IHM) is the structured regulatory document that lists every regulated substance present in a vessel's structure, equipment, operationally generated wastes, and stores - the documentary basis on which the EU Ship Recycling Regulation and the Hong Kong Convention determine whether the vessel can trade at EU ports and ultimately be recycled at compliant facilities. IHM service providers compile this document under IACS class society audit scheme, partner with ISO/IEC 17025 accredited laboratories for sample analysis, and deliver the Statement of Compliance (SOC) or International Certificate on Inventory of Hazardous Materials (ICIHM) that authorises continued vessel operation under both regulatory regimes.

IHM Regulatory Framework - EU SRR and Hong Kong Convention 2025

The inventory of hazardous materials sits at the intersection of two parallel regulatory regimes that now apply globally. The EU Ship Recycling Regulation (Regulation EU 1257/2013) has required a valid IHM since December 2018 on EU-flagged ships over 500 GT and, since 31 December 2020, on every non-EU-flagged ship calling at any EU port or anchorage. The Hong Kong International Convention for the Safe and Environmentally Sound Recycling of Ships entered into force on 26 June 2025 - the convention binds all signatory flag states and effectively imposes IHM Part I as a mandatory onboard document worldwide. IMO Resolution MEPC.378(80) provides the Guidelines for the Development of the Inventory of Hazardous Materials, setting threshold values for inclusion and the technical methodology that IHM service providers apply during survey, sampling, and document compilation.

IHM Document Structure - Part I, Part II, Part III

The inventory of hazardous materials carries a three-part structure that reflects the vessel's operational phase. Part I lists materials in the ship's structure and equipment - asbestos in gaskets and insulation, PCBs in transformer oil, ozone-depleting substances in HVAC and fire-fighting systems, organotin antifouling compounds on hull coatings, cadmium and lead in paints and battery banks, mercury in fluorescent lamps, hexavalent chromium in surface treatments, PBBs and PBDEs in flame-retardant plastics, PFOS in foam fire-fighting concentrates, short-chain chlorinated paraffins, and radioactive substances where applicable. Part I is the only mandatory document during the vessel's operational life and must be maintained current as equipment changes occur. Part II covers operationally generated wastes (oily sludge, residual cargoes, bilge water, sewage) and is compiled only at the pre-recycling stage. Part III covers stores remaining onboard at recycling time. Together Parts I, II, and III form the Final IHM that the recycling facility receives before vessel demolition begins.

IACS Class Approval and Recognition Scheme for IHM

The credibility of an IHM service provider rests on its recognition under the IACS class society audit scheme - the operator engages a class-approved IHM service provider specifically because the resulting Statement of Compliance must be issued by an IACS member. Each major class society operates its own IHM recognition scheme: DNV runs IHM Auditor authorisation under its environmental services scope; ABS authorises IHM providers under its Environmental Performance services framework; Lloyd's Register accredits IHM providers under ShipRight Environmental Services; Bureau Veritas Smart Ship covers IHM auditor recognition; RINA, ClassNK, KR, and CCS run parallel schemes. IACS UR Z (Unified Requirements for survey, inspection, and audit) frames the cross-society baseline for IHM provider recognition. Non-IACS bodies (HRS, INSB Class, RMRS, Other) recognise IHM providers under their own flag administration agreements. Recognition is provider-specific - a firm holding DNV authorisation may not be ABS-recognised, so the operator selects an IHM service provider aligned with the vessel's class registry.

ISO/IEC 17025 Laboratory Accreditation - The Lab-Side Requirement

Every IHM service provider relies on an ISO/IEC 17025 accredited analytical laboratory for the sample analysis that underpins Part I document content. Lab accreditation covers specific test methods - ISO 14966 polarised light microscopy for asbestos identification, ISO 13794 transmission electron microscopy for asbestos confirmation at low concentration, EN 16167 or EPA 1668 GC-MS for PCBs, ICP-MS or AAS for heavy metals (cadmium, lead, mercury, hexavalent chromium), LC-MS per EPA 537.1 for PFOS, GC-MS for PBBs and PBDEs. The lab's scope of accreditation document defines which substances and matrices it can analyse with traceability to national metrology standards (NIST in the US, NMI in the UK, PTB in Germany). The IHM service provider's choice of lab is class-society visible at audit - the operator selects an IHM provider whose lab partnership covers the full regulated substance list under MEPC.378(80) Table 1.

IHM Compilation Workflow with Class Society Liaison

The IHM compilation workflow runs from vessel survey through document delivery on a defined sequence. Stage one - building specification review and visual screening, where the IHM expert reviews drawings, equipment lists, maintenance records, and bunker history to identify Suspected Hazardous Materials (SHM) and Potentially Hazardous Materials (PHM). Stage two - the onboard sampling campaign collecting physical samples from gaskets, insulation, paints, cable jackets, plastic mouldings, oils, and any equipment flagged at stage one with chain-of-custody documentation per MEPC.378(80) Appendix 4. Stage three - ISO/IEC 17025 laboratory analysis returning quantitative results against MEPC.378(80) Table 1 threshold values. Stage four - document compilation producing the IHM Part I in the prescribed format with material location, concentration, mass, and disposal coding. Stage five - class society submission, where the IHM provider's recognised status allows direct submission to the class surveyor for review and SOC or ICIHM issuance. The class surveyor verifies sampling completeness, lab traceability, and material location accuracy before authorising the certificate.

Maintenance, Renewal, and Pre-Recycling Survey

An IHM is a living document that requires maintenance throughout the vessel's operational life. The IHM service provider maintains Part I as new equipment is installed, replaced, or removed - tracking the Material Declaration (MD) and Supplier Declaration of Conformity (SDoC) that ship from each spare part purchase. Annual class survey reviews the maintained IHM and confirms continued SOC validity; renewal survey at 5-year intervals refreshes the certificate. At end of operational life, the IHM service provider expands the document with Part II (operationally generated wastes) and Part III (stores) producing the Final IHM ready for delivery to the recycling facility along with the Ship Recycling Plan (SRP) that the yard prepares. The class society issues the International Ready for Recycling Certificate (IRRC) against the Final IHM and SRP, authorising vessel delivery to the recycling yard. For the end-of-life vessel disposal scope at ship recycling yards, the recycled vessel arrives with the complete IHM dossier the IHM service provider has compiled and maintained across the ship's operational life.

Selecting an IHM Service Provider

When you shortlist IHM service procurement partners, weigh the structural evidence on each profile:

• IACS class society recognition matched to vessel registry - DNV, ABS, Lloyd's Register, Bureau Veritas, RINA, ClassNK, KR, or CCS recognition scheme aligned with the vessel's class society; non-IACS recognition where the flag administration accepts it.
• ISO/IEC 17025 laboratory scope - accreditation covering asbestos (ISO 14966), PCBs (EN 16167), heavy metals (ICP-MS), PFOS (LC-MS), and brominated flame retardants; traceability to national metrology standards.
• IHM auditor qualification - trained Maritime Expert per MEPC.378(80), class-society-authorised auditor status, documented portfolio of Part I compilations across vessel types matching your fleet.
• Maintenance and renewal contract scope - IHM update workflow integrated with the operator's procurement process for MD/SDoC tracking, annual review submission to class, 5-year renewal pricing.
• Pre-recycling Final IHM capability - experience compiling Part II and Part III with class-society IRRC issuance, working knowledge of EU European List facilities and Hong Kong Convention-authorised yards.

IHM service providers worth shortlisting deliver IACS class society recognition matched to the vessel's registry, ISO/IEC 17025 laboratory partnership covering the full MEPC.378(80) substance list, the Maritime Expert auditor qualification that the class society requires at SOC or ICIHM issuance, and the maintenance discipline that keeps the inventory of hazardous materials current across the vessel's operational life. For broader hazardous materials survey work outside the IHM regulatory document scope - asbestos abatement clearance, pre-drydock surveys, indoor air quality assessment, pre-purchase hazmat due diligence - hazardous materials survey service providers cover the survey-activity scope that pairs with but is distinct from IHM compliance.