Hazardous Substances
Labels and safety information, exposure routes, COSHH controls, storage, spills, skin protection and health reporting.
How to prepare for the CITB Operatives test
Connect hazard recognition with safe action: stop, protect, follow the site system and escalate to the right competent person.
Core concepts
Concept 1
Hazardous substances can enter through breathing, skin or eye contact, swallowing or injection and may cause immediate or delayed harm.
Exam cue: Check the exact substance, task, exposure route and approved control before use.
Concept 2
The task assessment and product information determine substitution, containment, ventilation, handling, storage, hygiene and PPE controls.
Exam cue: Keep products in labelled compatible containers and segregate incompatible materials.
Concept 3
Spills, damaged containers and unexpected reactions require the site's emergency procedure, not improvised cleanup.
Exam cue: Wash correctly and report dermatitis, breathing trouble or other symptoms early.
Risk pitfalls and guardrails
Decanting a product into an unlabelled food or drink container.
Guardrail: Do not solve a missing guard, isolation, barrier, competent plan or engineering control only with a warning or PPE.
Mixing products because each is safe when used separately.
Guardrail: Do not solve a missing guard, isolation, barrier, competent plan or engineering control only with a warning or PPE.
Using barrier cream as a substitute for preventing skin contact.
Guardrail: Do not solve a missing guard, isolation, barrier, competent plan or engineering control only with a warning or PPE.
Memory anchors
Know Before Use
Read the task control and product information before opening or mixing a substance.
Routes Matter
Control inhalation, skin and eye contact, ingestion and injection as applicable.
Label and Contain
Use the correct sealed, labelled and compatible container.
Never Improvised Mixes
Only combine substances where the approved method explicitly requires it.
Spill Plan, Not Guess
Raise the alarm, isolate and use trained spill response.
Skin Signs Count
Report redness, cracking, itching or breathing symptoms before harm becomes chronic.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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