CSCS COSHH 4

Question 1

What is the WEL (Workplace Exposure Limit) for respirable crystalline silica (RCS) in the UK?

Accepted Answer

0.1 mg/m³ (8-hour TWA)

Answer

The UK WEL for respirable crystalline silica is 0.1 mg/m³ as an 8-hour time-weighted average, as listed in HSE EH40. This very low limit reflects the serious health risks including silicosis and lung cancer from prolonged exposure.

Question 2

Which section of a Safety Data Sheet contains information about first aid measures?

Accepted Answer

Section 4

Answer

Section 4 of a Safety Data Sheet covers first aid measures, including symptoms of exposure and required treatment for inhalation, skin contact, eye contact, and ingestion. This information is essential for construction site first aiders dealing with chemical incidents.

Question 3

Under COSHH, when must a risk assessment be reviewed?

Accepted Answer

When there is reason to believe it is no longer valid, or when there has been a significant change in the work

Answer

COSHH assessments must be reviewed when there is reason to suspect they are no longer valid, when there has been a significant change in the work activity, or when monitoring or health surveillance results indicate a problem. Regular review is also considered good practice.

Question 4

What is 'substitution' in the COSHH hierarchy of control?

Accepted Answer

Replacing a hazardous substance with one that is less hazardous or non-hazardous

Answer

Substitution means replacing a hazardous substance with a less hazardous or non-hazardous alternative. For example, using water-based paint instead of solvent-based paint, or using pre-mixed mortar instead of mixing dry cement. It is the second most effective control after elimination.

Question 5

What PPE may be required under COSHH when handling corrosive substances on a construction site?

Accepted Answer

Chemical-resistant gloves, safety goggles, and a face shield as appropriate to the risk assessment

Answer

When handling corrosive substances, PPE selection must be based on the COSHH risk assessment and may include chemical-resistant gloves, safety goggles or a face shield, chemical-resistant apron or overalls, and respiratory protection if vapours are present. PPE must be CE-marked and suitable for the specific substance.

CSCS Green Card Practice Test

CSCS Green Card Practice Test

CSCS COSHH 4