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Silica dust – what is it and how does it affect your health?
Mar 15, 2023
You may have heard about the dangers of silica dust. And that it causes a progressive, irreversible, untreatable and potentially fatal disease of the lungs called silicosis.
You may know that dry sandblasting, grinding, cutting, sanding, polishing, and drilling of silica-containing materials like concrete, rock, glass, asphalt, cement and particularly engineered stone are hazardous tasks in construction. Why? Because you create silica dust that is too small to settle. It floats around undetected in the air that is breathed in by you and those around you.
WorkSafe Victoria’s free “stonemans’ screening project” diagnosed 29% of engineered stone workers with silicosis in 2019/2020, and a similar campaign in 2021 in Queensland, Australia, diagnosed 20% of engineered stone workers with silicosis – some are young, and some are without symptoms as yet!
Am I protected if I’m wearing a respirator?
Tiny silica dust particles can penetrate your respirator if you aren’t careful. Make sure your respirator has been fit-tested and isn’t worn over a beard. You must also have the correct filters, as Silica dust is 100 times smaller than sand and can penetrate some filters.
Prevention sounds like a better option! What steps can I take?
Step 1: Understand what happens when you inhale silica dust.
Knowledge will empower you to make wise choices:
- Watch the two-minute video here.
- Thankfully your lungs have built-in traps that catch most impurities and dust. The nose, windpipe and air tubes are lined with mucus membranes. Dust that was not sneezed out, sticks to the mucus and is coughed out, spatted out or swallowed.
- But some respirable crystalline silica/RCS dust escapes these traps and is tiny enough to enter the deepest destination in the lungs where they cause irritation, inflammation and scar tissue formation, even after silica dust exposure is stopped. Widespread, ongoing scar tissue formation reduces the surface area that is left for gas exchange, reducing your oxygen levels.
Step 2: Know the silica content of your construction materials and substitute for less hazardous materials!
- The higher the silica content of the material, the more silica dust is created. For instance the extremely high silica content of engineered stone causes “accelerated silicosis”.
- Stop exposure: the Australian Government has an engineered stone ban. Strict rules now apply if you need to work with already installed engineered stone.
- Lessen exposure: substitute high-silica-content materials for no/low-silica-content materials.
- Examples of the silica content of some of your construction materials:
- Engineered stone: up to 92%!
- Fibre-cement sheeting: 5-40%.
- Concrete and slate: 20-40%.
- Granite/natural stone: 25-60%.
- Silica contents of products like cement can be found in their Safety Data Sheets (SDS).
Are there symptoms to look out for?
Damage to the lungs from silica dust and symptoms of disease may not appear for many years. Workers may not show any symptoms, even at the point of initial diagnosis, which is why prevention and health monitoring are critical. Often workers are diagnosed during routine health monitoring, as chest x-rays may show scar tissue formation even if you are without symptoms. Silicosis symptoms may include a dry cough, shortness of breath, fatigue, fever, chest pain and unexplained weight loss. Silicosis also increases your risk for other conditions like lung cancer, chronic bronchitis, kidney disease and some auto-immune diseases.
What if I’m experiencing some of these symptoms?
Tell your doctor about your current or previous exposure to silica dust. To rule out silicosis, respiratory questionnaires, lung function tests, chest X-rays and CT scans may be required.
Why is health monitoring important?
Early detection of silicosis, before symptoms develop, can motivate you to stop further exposure, and thereby improve your health outcome.
How do I organise health monitoring?
If you were exposed to silica dust currently or in the past, even if you wore respirators and even if you have no symptoms, you need routine health monitoring. Talk to your employer. Tell your doctor about your exposure. Engineered stone workers must see specialist occupational health doctors. Early detection is most important!
Treatment
Treatment is limited to relieving symptoms. For instance, oxygen therapy and bronchodilators will allow you to breathe more easily. Advanced silicosis requires lung transplants.
More Information on how to protect yourself from the risk of inhaling silica dust:
It is important to understand that depending on the State/Territory you are working in, there are very likely specific requirements you need to meet to ensure you are appropriately managing the risks. The state regulators have plenty of information available to learn more. We have provided a few key links below for you: