Chemical Register Management for Manufacturers

The chemical register is the foundation of chemical safety management in manufacturing. The WHS Regulation 2025 requires every PCBU that uses, handles, or stores hazardous chemicals to maintain a register of all hazardous chemicals at the workplace, with current Safety Data Sheets for each chemical readily accessible to workers. A chemical register that is incomplete, outdated, or inaccurate creates compliance gaps that propagate through every downstream process including risk assessment, exposure monitoring, health surveillance, storage segregation, emergency planning, and PPE selection. When the incoming WELs take effect in December 2026, chemical registers will need to be cross-referenced against the new limits to identify which chemicals on site have substances with changed exposure limits. Chemicals that were previously considered low-risk because exposures were well below the old WES may become compliance priorities under the tighter WELs. A current, accurate chemical register is the starting point for every WEL transition assessment.

A complete chemical register must list every hazardous chemical present at the workplace, including raw materials, process chemicals, cleaning agents, maintenance products, laboratory reagents, and waste chemicals awaiting disposal. Each entry should record the product name, manufacturer, GHS hazard classification, physical form, typical quantities on site, storage location, and the date of the most recent Safety Data Sheet. The register should be cross-referenced to the workplace exposure limit schedule so that every chemical containing a substance with a WEL is flagged for exposure monitoring consideration. Building a complete register requires a physical walkthrough of every area where chemicals are used or stored, including production areas, maintenance workshops, laboratories, cleaning stores, paint shops, and waste storage areas. Desk-based registers compiled from purchasing records alone always miss chemicals brought on site by contractors, samples received from suppliers, and legacy chemicals stored in overlooked locations. The register should be reviewed whenever new chemicals are introduced, existing chemicals are replaced, or processes change.

Safety Data Sheets are legally required for every hazardous chemical on the register. The WHS Regulation 2025 requires SDSs to be current — generally no more than five years old — and readily accessible to workers who use or may be exposed to the chemical. Managing SDSs in a manufacturing facility with hundreds of chemicals across multiple locations is a significant administrative task. Expired SDSs must be replaced by requesting current versions from suppliers. SDSs must be available in the languages understood by workers at the facility. Physical SDS folders at point-of-use locations must be maintained and updated when new SDSs are received. Electronic SDS management systems provide searchable access, automatic expiry alerts, and version control that paper-based systems cannot match. When reviewing SDSs for WEL transition purposes, check Section 8 (Exposure Controls and Personal Protection) for the listed exposure limits and compare them against the incoming WELs. Many SDSs still reference the old WES values and will need to be updated by manufacturers after December 2026.

The chemical register drives storage segregation decisions. The GHS classification system assigns hazard categories that determine which chemicals can be stored together and which must be separated. Flammable liquids must be stored in compliant flammable liquids cabinets or bulk storage areas with fire protection. Oxidisers must be separated from flammable liquids and combustible materials. Corrosive acids must be separated from corrosive bases. Toxic chemicals require secure storage with restricted access. Chemicals that react with water must be stored away from water sources and sprinkler systems. A chemical compatibility matrix derived from the chemical register identifies all incompatible pairings and specifies minimum separation distances or physical barriers. Storage areas must be bunded to contain spills, ventilated to prevent vapour accumulation, and signed with GHS hazard pictograms. Emergency information including spill response procedures, first aid measures, and fire-fighting requirements must be displayed at each storage location. Regular audits of chemical storage areas against the compatibility matrix identify chemicals that have been placed in incorrect locations.

The chemical register is the primary tool for identifying which incoming WEL changes affect your facility. Extract from the register every chemical that contains a substance with a changing WEL. For each chemical, identify the tasks and processes where it is used, the workers who are exposed, and the current exposure controls in place. Cross-reference the substance concentration in the product (from the SDS Section 3) with the process that generates exposure to estimate whether the incoming WEL is likely to be exceeded. Prioritise substances for baseline exposure monitoring based on this assessment. The register also identifies which health surveillance requirements are triggered by the substances on site. Workers exposed to scheduled substances above the action level require health surveillance, and the register identifies which workers are in scope. EHS Atlas integrates your chemical register with the incoming WEL schedule, automatically flagging chemicals that contain substances with changing limits. It cross-references exposure monitoring results against both the current WES and the incoming WEL, providing dual-assessment reporting that supports your transition planning.