COSHH Control Measures: How to Go Beyond PPE

Effective COSHH control measures start by removing or reducing the release, then containing, extracting and managing what remains. Personal protective equipment (PPE) is normally a supporting layer because it protects only the wearer and depends on correct selection, fit and use every time. The assessment must connect controls to the actual task.

Why is PPE not the first COSHH control measure?

PPE is less reliable than controls built into the process or workplace. HSE explains that PPE can fail through poor selection, fit, use, storage or maintenance and offers no protection to nearby people who are not wearing it. HSE therefore places PPE as the final control option where adequate control cannot be achieved by other means (HSE principles of good control practice).

Gloves and respirators can still be necessary. The mistake is beginning with “what PPE?” before asking why the substance is escaping, who it can reach and whether the task can be changed.

What order should COSHH controls follow?

Work from prevention toward increasingly dependent controls. A practical sequence is:

1. Eliminate the substance or task. Stop the activity or use a method that avoids the hazardous substance.
2. Substitute a safer product, form or process. Use a lower-hazard cleaner, pellets instead of dusty powder, or brushing instead of spraying where suitable.
3. Reduce quantity, frequency or people exposed. Use the minimum amount and keep others away.
4. Enclose or automate the source. Use closed transfer, lids, guards or remote handling.
5. Capture the release. Apply local exhaust ventilation (LEV) at the point where dust, fume, mist or vapour is generated.
6. Use a controlled method of work. Define sequence, positioning, cleaning, supervision and emergency steps.
7. Add suitable PPE. Cover residual exposure that cannot be adequately controlled by earlier measures.

HSE advises employers to prevent exposure at source and not automatically choose PPE (HSE COSHH assessment guidance).

How do controls relate to a specific activity?

A control is only meaningful when it addresses a release in a defined task. Consider a worker mixing a powdered ingredient into an open vessel.

Writing “wear gloves, goggles and mask” misses the largest exposure source: open tipping. Changing the transfer method may protect the operator and everyone nearby more reliably.

The assessment workflow should capture the task stages, not just reproduce the SDS PPE list.

How do you decide whether control is adequate?

Adequate control requires evidence that measures reduce exposure to the required level and work consistently. Consider the severity of harm, magnitude and duration of exposure, workplace exposure limits where applicable, and the reliability of each measure.

Check:

• the hood or enclosure is positioned around the real release;
• airflow or other performance indicators meet the design;
• workers use the method without bypassing controls;
• cleaning does not create a second exposure;
• maintenance and examination are completed;
• monitoring, where necessary, supports the exposure conclusion;
• incidents, symptoms and visible contamination do not contradict the assessment.

HSE describes control equipment, ways of working and worker behaviour as connected parts of exposure control and says controls should be tested regularly (HSE control measures).

What makes an engineering control practical?

A practical control fits the task and makes the safer action easy. An LEV hood too far from the source, an enclosure that prevents accurate work or a lid that must be removed for every addition will often be defeated.

Involve operators before installation. Test normal, cleaning and maintenance work. Provide simple indicators for correct operation and define what workers should do if the control fails. Review whether enclosure creates heat, ergonomic, fire or explosion risks.

Where does PPE still fit?

PPE covers residual risk and short-duration exceptions after stronger controls have been considered. Select it for the substance, route, task, duration, wearer and other equipment.

For gloves, specify material and replacement rules rather than “chemical resistant”. For respiratory protective equipment, determine the contaminant, required protection, device suitability, face-fit needs, maintenance and training. HSE notes that PPE protects only while worn and the employer is responsible for providing, replacing and paying for it (HSE COSHH PPE).

How should COSHH controls be recorded and reviewed?

Record the purpose, operating standard and evidence for each control. State which task stage it addresses, how it should be used, inspection or maintenance frequency, failure response and owner.

Review controls when products, quantities, equipment, layout or work methods change, and after defects, monitoring concerns, incidents or worker reports. The Safe Foundry features can keep source information, task controls and review history linked while preserving the human decision.

The best assessment lets a worker see why each control exists and lets a reviewer verify that exposure is prevented or controlled in practice. PPE then becomes one deliberate layer in a complete system rather than the entire plan.

How can you improve an existing PPE-heavy assessment?

Start with the highest-exposure task and work backwards from the source. Observe one full cycle, including preparation, cleaning and waste. Mark where the substance leaves its container or process, where the worker's breathing zone and hands are positioned, and where contamination spreads.

For each release ask whether it can be removed, reduced, enclosed or captured. Replace generic instructions with physical or procedural changes. For example, change “wear a respirator while decanting solvent” to “use a closed pump and return connection, keep the receiving container covered, and use the assessed extraction; wear specified gloves and eye protection for connection and disconnection.”

Then test the revised method with workers. A control that slows the task, obscures the work or creates awkward handling may be bypassed. Modify the design before relying on supervision alone.

What should happen if stronger controls are not available immediately?

Use a documented interim decision that does not turn temporary PPE into the permanent default. Assess whether work can continue, reduce quantity and frequency, restrict access, improve existing ventilation and provide suitable PPE where these measures can adequately control the short-term exposure.

Give every engineering or substitution action an owner and date. State the conditions that require work to stop, such as extraction failure or unavailable RPE. Review the interim assessment until the stronger control is installed and verified.

How can control quality be measured?

Track leading evidence rather than waiting for illness or an incident. Useful indicators include enclosure or extraction user-check completion, defect response time, maintenance results, repeat contamination findings, monitoring trends, PPE failures and worker reports.

Where controls depend on behaviour, observe the whole method and ask why deviations occur. Repeated bypassing may show a design problem. Where exposure remains uncertain, competent monitoring can test whether the combination of controls is adequate.

How should new controls be commissioned?

Verify installation and real-task performance before declaring the assessment complete. Check the design requirement, airflow or containment evidence, operating sequence, user indicator, maintenance plan and failure response.

Observe representative work with operators and confirm that the control does not introduce a new chemical, ergonomic, fire or equipment risk. Update instructions and training, then record the evidence and review date. A purchase order or photograph is not proof that exposure is adequately controlled.