Containment Level 2 (moderate hazard)

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Workplace Control Measure Guidance

The following guidance is provided as an aid for those carrying out risk assessments for controlling exposure to hazardous substances in the workplace – the guidance itself does not constitute a risk assessment. Assessors will need to determine requirements on a case-by-case basis taking into account the degree of exposure, the hazardous properties of the substances and requirements of the COSHH Regs (2002).

Control Measure

Laboratory Handling
(<approx. 1 Kg)

Bulk Handling & Processing
(>approx. 1 Kg)

Engineering Controls; Chemical Handling Good-Practice

(1) Gram quantities of “low dustiness” powders or liquids with low vapour pressures can be handled on the open bench.

(2) The handling of volatile liquids, dusty powders or carrying out any procedure likely to release significant amounts of dust or vapour should be carried out in fume cupboards or ventilated enclosures. Examples include weighing powders, charging powders, decanting liquids etc.

(3) Suitable provision should be made for collecting spillage from liquid handling operations, waste bottles etc.

(1) Suitably designed plant and processes should be provided to contain or minimise emissions of hazardous substances. Where it is not possible to contain or adequately control emissions of dust or vapour e.g. during handling/processing operations, effective local exhaust ventilation (LEV) should be provided to control emissions at source.

(2) General ventilation should be provided where there is likely to be a significant build up of contaminants in the working environment.

Respiratory Protective Equipment (RPE)

RPE will not normally be required where either a fume cupboard or ventilated enclosure is used as the primary control measure. Risk assessments should identify procedures where LEV may not be adequate to control exposure. In these cases suitable RPE should be used.

Adequate control of exposure should be achieved by engineering means. RPE should be used where:-

  • adequate control of exposure cannot be achieved by good design of LEV, or
  • exposures are irregular & of short duration.

Chemical Protective Clothing (CPC)

Risk assessments should identify:

  • Requirements for CPC during chemical handling procedures. In addition to chemical protective gloves and eye protection, the assessment should identify types of CPC required to protect other parts of the body that might be exposed if there are any spillages arising from liquid/powder handling.
  • Where contamination of the working environments may significantly contribute to exposure. where there is with particulate contamination. In these areas suitable types of CPC should be worn at all times. Assessments should identify requirements for changing clothes, storing of clothing, cleaning and/or disposal of contaminated clothing.

For liquid handling CPC should comply with CEN Standard Type 3 or 4. Manufactures test data should also be obtained to ensure CPC (especially gloves) will provide adequate protection for the duration of intended use.

For powder handling CPC should comply with CEN Standard Type 5 (for low exposure protection) or CEN Standard Type 3 or 4 (for high exposure protection).




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