SILICA DUST

The contractor's guide to understanding silica dust.

WHAT IS SILICA DUST & CRYSTALLINE SILICA?

Silica is Quartz, and is found naturally in almost all rock, sand, soil, brick and concrete products. Silica Dust is the collection of respirable particles that are released into the air when cutting, mixing or doing other work practices with quartz materials.

WHY SHOULD I CARE ABOUT SILICA?

Silica is an important topic in the construction industry especially with the new rule passed by OSHA. It is important for you to protect your health plus be mindful of the OSHA requirements. The new rule requires employers to use engineering controls to limit worker exposure, develop a written exposure control plan, and train workers on silica risks, among other requirements.

What does all this mean to the average contractor? We’ve created this silica dust resource page for contractors and industry professionals to help answer that question.

WHAT KIND OF WORK CAUSE SILICA EXPOSURE?

Below are many common work practices used today in the construction industry that create silica exposure. Each of these work practices can potentially expose workers to respirable crystalline silica at levels 10X to 200X above the OSHA PEL.

CORING & GRINDING

CONCRETE POLISHING

DRY CUTTING

DRY SWEEPING

HOW DOES SILICA AFFECT MY HEALTH?

WHAT IS SILICOSIS?

Silicosis: A non-reversible lung disease. Acute silicosis: cough, weight loss, and fatigue presents in a few weeks or years of exposure to inhaled silica. Chronic Silicosis: appears 10 to 30 years after exposure, affects upper lungs and causes extensive scarring. Accelerated Silicosis: occurs within10 years of high-level exposure.
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WHAT IS COPD?

COPD causes obstructed airflow from the lungs. Airways become thick and inflamed and air sacs lose their elastic quality. Too much mucus is made and blocks airways.
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SILICA DUST EXPOSURE SYMPTOMS

• Shortness of breath • Loss of appetite
• Chest pains
• Fatigue
• Severe cough
• Cyanosis (bluish skin)

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WHAT DOES OSHA SAY ABOUT SILICA?

OSHA SILICA PEL

The PEL, or Permissible Exposure Limit, is the legal limit established by OSHA for worker exposure to silica. In simple terms, how much dust a worker is legally allowed to breathe over an eight hour period.

50ug SiO2/m3

The PEL is determined by three factors: Air, Dust and Time. For us to understand the PEL we need to have a better grasp of each factor.

AIR X DUST X TIME = EXPOSURE LEVEL

AIR

How much air does a person breathe? The answer depends on a number of factors.
• Height
• Weight
• Fitness level
• Activity

The average adult male working at a moderate activity level inhales 16.8 cubic meters of air over the course of an 8-hour work day.

DUST

The amount of silica dust in the air one breathes affects your exposure level. This depends on a number of factors: What type of material is being cut? How much material is being removed in a cut? What is the silica content of that material? Air monitoring will give real time exposure level results for specific work practices.

TIME

Time is the third factor used to calculate the PEL. Since a worker breathes 16.8m3 of air in eight hours, and the OSHA PEL is 50μg/m3, the total maximum exposure for eight hours is 840μg (16.8m3 x 50μg).

OSHA REGULATIONS AND REQUIREMENTS FOR SILICA DUST

HOW MUCH SILICA DUST IS HARMFUL?

If you can see the dust around you - its too much dust., Using tools like air monitors or resources like Time Weighted Average and the Hierarchy of Controls, can help you determine your real exposure levels.


TIME WEIGHTED AVERAGE FOR MONITORING EXPOSURE

Time Weighted Average (TWA) is used to calculate a worker’s daily exposure to a hazardous substance averaged to an 8-hour workday, taking into account the average levels of the substance or agent and the time spent in the area. While some workers may engage in a single work practice throughout a workday, others may engage in multiple work practices. As you know, each work practice varies from high exposure to zero exposure to silica. OSHA lets us average the exposure over an 8-hour day. This averaging allows us to vary the activities a person performs to help keep them in a safe air environment during their workday.

HIERARCHY OF CONTROLS FOR SILICA DUST

A system used to minimize or eliminate exposure to hazards. It is a widely accepted system promoted by numerous safety organizations. OSHA has set the exposure limit to 50 micrograms of respirable crystalline silica per cubic meter of air or, 50 µg SiO2/m³ , over an eight-hour time weighted average (TWA).

SHOP ACCESSORIES

HOW TO PROTECT YOURSELF FROM SILICA DUST

The fact is a majority of those affected by the silica dust problem know very little about it, or even that there is a problem. That’s why the solution must start with education. Use this page and the resources linked below to educate yourself and your workers about silica.

Know the Hazard - Understand the hazard and risks associated with silica exposure.
Know the Standards - Understand the OSHA PEL and what it means to you, your business and your workers.
Know Your Exposure- Understand how to use air monitoring to measure silica exposure levels and
understand the results. Know Your Options - Understand your options, including tools, work practices and educational resources for controlling silica exposure on your job sites.

Our goal is to see the construction industry 100% dust free. We aim to achieve that goal through education and the development of professional tools and technology to eliminate silica dust from job sites.

Know the standard. Know your exposure. Know your options. And take action

SILICA RESOURCES & REGULATIONS

Why Do We Care?

Silica dust is a major problem affecting the construction industry. One thing we know is it won’t go away by ignoring it

We were in your shoes. We have lived with silica before there were options to eliminate it. Now there are ways to protect your health, and the health of your employees

We have partnered with the American Lung Association to bring education to the industry. We have donated over $100,000 the last few years for silicosis research and education. We continue to grow that relationship and give back to the industry.