Identify the substance and mixture
INSST’s INFOCARQUIM entry identifies formaldehyde by CAS 50-00-0 and lists its classification as a category 1B carcinogen and category 2 mutagen. It also identifies toxicity, corrosion and skin sensitisation hazards.
Formol and formalin are terms used for certain solutions. Assessment must check the specific product’s concentration, composition and safety data sheet: mixtures carrying these names do not all have identical conditions of use or hazards.
Locate tasks that release vapour
NTP 873 describes uses in industrial processes and healthcare facilities. Opening containers, handling specimens, transferring liquids, cleaning and managing waste may alter release compared with closed storage.
Describe each operation and nearby people, rather than only the main user’s working day. Odour does not replace assessment or establish that exposure is acceptable.
Consider alternatives and closed processes
Royal Decree 665/1997, applicable in Spain, requires avoiding carcinogenic agents through substitution where technically possible. The alternative must fulfil the required function without transferring the problem to another hazard.
If substitution is impossible, the regulation’s closed-system and exposure-reduction measures apply. The decision must include auxiliary tasks, not just the main operation.
Capture emissions where they arise
Keeping containers closed when not in use and providing appropriate capture for emitting operations reduces dispersal. Design must consider source position, movements and working methods.
General ventilation does not automatically replace necessary extraction. Equipment must be maintained and checked; an installation that appears operational may fail to capture vapours adequately throughout the task.
Assess using current references
Annex III of Royal Decree 665/1997 contains formaldehyde limits. Assessment must consider relevant reference periods and operations that may cause significant brief exposures.
The INSST LEP database provides updated values and notes. Older publications may retain technical value, but their classifications or limits must not be copied as current. Meeting a limit also does not replace other required measures.
Prepare protection and incident arrangements
Gloves, eye protection and, where appropriate, respiratory protection must be selected according to the product and anticipated exposure. Use, storage and replacement instructions compatible with the task are needed.
Spills require procedures, resources and trained personnel. Waste and container management must prevent releases and incompatible mixtures. Health surveillance must be specific, with exposure records and confidentiality protection.
Hypothetical example: receiving specimens
A laboratory reviews receipt of specimens preserved in a formaldehyde solution. It finds the main procedure is controlled, but containers are opened on an auxiliary bench without equivalent extraction.
It reorganises the workflow, checks measures and assesses that task. Control no longer depends solely on the analysis workstation and also covers receipt, storage and waste removal.
