Essential controls to protect the lungs of workers:

• use on tool water suppression​
• control the mist generated ​
• use powered air purifying respirators (PAPR) ​

Detailed guidance is available in the COSHH essentials for stoneworkers: Silica sheet ST3A (PDF) .

​On tool water suppression​

No work should be done dry, using water reduces dust. Mains-fed water is preferable, if you use recirculated water there are extra checks and maintenance required to keep bacteria and silica levels under control.​

​Mist control​

The mist and slurry generated from working with engineered stone will contain crystalline silica. Providing mechanical ventilation prevents the build-up of mist, the system needs to be able to extract wet mist. Work with powered handheld tools should be done within a partially enclosed and externally vented booth, for example a water wall local exhaust ventilation (LEV) booth.​​

Protective equipment (RPE and PPE)​

Powered air purifying respirators (PAPR) are an effective type of respiratory protective equipment (RPE) for this task. They are more comfortable to wear for long periods, is more suitable for a wet environment and a face fit test is not always needed, so suitable for those with facial hair.​​

RPE needs to be kept clean, stored in a clean place and checked before use. Thorough maintenance, examination and testing should be carried out at least once a month.​​

Workers need coveralls that do not retain dust – synthetic rather than cotton. If exposure to the mist is likely, they should also provide water protection. Workers should not wear their own outer clothing in contaminated areas. You need suitable arrangements in place for storage, laundering and replacement. They’ll also need suitable footwear and gloves.​​

Cleaning, housekeeping and maintenance​

✓ No eating, drinking and smoking in contaminated areas​

✓ Plan regular maintenance of equipment and always check for signs of damage before starting work​

✓ Clean work equipment and the work area daily and other equipment and the workroom at least once a week​

✓ Eliminate the use of dry brushing or compressed air for removing dust from clothing, surfaces and machinery​

✓ Vacuum dry dust or use wet cleaning methods​

✓ Clear up slurry and dispose of it safely​

✓ Provide warm water, mild skin cleansers, barrier creams and soft paper or fabric towels for drying hands.