Educational workplace-safety awareness — connected to industries, occupations, employment law, employment documents and company types. Informational only — not legal advice and not a substitute for mandatory workplace safety training; employers remain responsible for compliance, training and worker authorization.
What hazardous substances are
A hazardous substance is any material that can harm health through contact, swallowing, breathing in or absorption — including chemicals, cleaning products, paints, solvents, dusts, fumes, gases and some biological agents. Harm can be immediate, such as burns, or develop over time, such as respiratory disease.
This page is general awareness only. Which substances are present, how harmful they are and the controls that apply must come from the employer’s assessment of those specific substances, the supplier safety information and the applicable law — not from this page.
Why it matters and where it applies
- Exposure can cause skin damage, breathing problems, poisoning and long-term illness.
- It applies almost everywhere — cleaning, manufacturing, laboratories, healthcare, agriculture and trades.
- Some effects build up slowly, so harm is not always obvious at the time.
- Labels and safety data sheets carry vital information that is easy to overlook.
- Storage, mixing and disposal all carry their own risks.
Key general points and good practice
- Reading the label and the supplier safety data sheet before use.
- Understanding the main routes of exposure: skin contact, inhalation and ingestion.
- Using the controls the assessment specifies, such as ventilation, enclosure or substitution.
- Using PPE — gloves, eye protection, respiratory protection — where the assessment requires.
- Storing substances correctly and keeping incompatible materials apart.
- Following the right disposal route rather than pouring substances away.
Practical awareness tips
- Never decant chemicals into unlabelled or food containers.
- Do not mix products unless you are instructed it is safe to do so.
- Keep lids closed and containers upright to limit fumes and spills.
- Wash hands before eating and avoid touching your face during use.
- Report damaged labels, leaks or unfamiliar substances to a supervisor.
Common misunderstandings
- Assuming a product is safe because it is in everyday use.
- Thinking a smell is harmless, or that no smell means no hazard.
- Believing gloves alone protect against every substance.
- Treating this awareness page as a substitute for the substance-specific training and assessment your employer must provide.
Free, printable HR & employment resources
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