2 This training is intended to be educational and should not be construed as legal guidance. It is provided as a courtesy to our customers and others who may benefit from the information contained herein. New Pig Corporation assumes no responsibility for misuse or mishandling of our information or products.
3 What is silica?
4 What is silica? Crystalline silica is an abundant mineral in the earth s crust, and a basic component of most classes of rock. It occurs in several forms, the most common being quartz.
5 What is silica? Silica refers broadly to the mineral compound silicon dioxide (SiO 2 ) Silica can be crystalline or amorphous Crystalline silica is more hazardous to employees than amorphous silica Three common forms: Quartz Cristobalite Tridymite
6 Where is silica used?
7 Silica is used in Common workplace operations involving: Cutting Sawing Drilling Crushing of concrete Brick, block, rock, concrete and stone products Operations using sand products, such as in glass manufacturing and sandblasting
8 Silica is used in Many manufacturing facilities in the form of clay-based loose absorbents Cat litter, floor sweep, diatomaceous earth and many other types of loose absorbents contain crystalline silica
9 What industries are at the highest risk for crystalline silica exposure?
10 High Risk Industries Occupational exposure to crystalline silica occurs across a broad range of industries, including: Mining Manufacturing Construction Maritime Agriculture
11 High-Risk Occupations Abrasive Blasting Foundries Contractors and Construction Utilities Masonry, Stone Setting and Other Stone Work Clay Refractories Ready-Mixed Concrete Cement and Brick Manufacturing Asphalt Paving China and Ceramic Manufacturing Tool and Die Industry Manufacturing of Household Abrasives, Adhesives, Paints, Soaps and Glass Cut Stone and Stone Products Steel Works, Blast Furnaces
12 What are silica s health hazards?
13 History of Hazards Silicosis is one of the world's oldest known occupational diseases reports date back to ancient Greece. By 1800, many names for silica-related illnesses arose: Grinders' Asthma Grinders' Rot Masons' Disease Miners' Asthma Potters' Rot Stonemasons Disease
14 History of Hazards During the 1920s, the health risks of the dusty trades emerged as a significant public health concern Silicosis was listed as the underlying cause of death in 6,322 fatalities in the United States from 1968 through 1990 From 1985 to 1992, death certificates for approximately 868 men and 46 women listed silicosis as the underlying cause of death in nonmining occupations
15 Silicosis Silicosis is a fibrotic disease of the lungs caused by the inhalation of crystalline silica dust Respirable silica dust enters the lungs and causes the formation of scar tissue, reducing the lungs ability to take in oxygen There is no cure for silicosis
16 Silicosis Chronic/classic silicosis: The most common form of silicosis Typically occurs after years of low to moderate exposure Symptoms may or may not be obvious at first As the disease progresses, the worker may experience shortness of breath upon exercising and have clinical signs of poor oxygen/carbon dioxide exchange In the later stages, the worker may experience fatigue, extreme shortness of breath, chest pain, or respiratory failure
17 Silicosis Acute silicosis: Occurs after a few months or as long as two years following exposure to extremely high concentrations of respirable crystalline silica Symptoms of acute silicosis include severe disabling shortness of breath, weakness, and weight loss, which often leads to death
18 Silicosis Accelerated silicosis Can occur after 5 10 years of high exposures to respirable crystalline silica Symptoms include severe shortness of breath, weakness, and weight loss The onset of symptoms takes longer than in acute silicosis
19 Tuberculosis Tuberculosis (TB) is a common, infectious disease caused by various strains of bacteria Because silicosis affects lung function, it makes people more susceptible to lung infections like tuberculosis NIOSH studies have firmly established an association between tuberculosis (TB) and silicosis
20 Chronic Obstructive Pulmonary Disease Chronic Obstructive Pulmonary Disease (COPD) is a progressive disease that makes it hard to breathe This disease can become worse over time Studies have shown that occupational exposure to respirable crystalline silica is associated with COPD, including bronchitis and emphysema
21 Immunologic Disorders & Autoimmune Diseases Several studies have found statistically significant increases in death or incidences of immunologic disorders and autoimmune diseases in employees exposed to silica. These disorders and diseases include: Scleroderma Rheumatoid arthritis Lupus Sarcoidosis
22 Renal Disease Studies report statistically significant associations between occupational exposure to silica dust and several renal diseases or effects, including: End-stage renal disease morbidity Chronic renal disease mortality Wegener's Granulomatosis
23 What organizations recognize silica hazards?
24 Recognizing Hazards The International Agency for Research on Cancer (IARC) has designated crystalline silica as carcinogenic (substance that causes cancer) to humans.
25 Recognizing Hazards The U.S. National Toxicology Program has concluded that respirable crystalline silica is known to be a human carcinogen.
26 Recognizing Hazards The National Institute for Occupational Safety and Health (NIOSH) has reviewed silica hazards and published guidance documents for preventing silica-related illnesses.
27 Recognizing Hazards Exposure to crystalline silica is addressed by several OSHA standards for general industry, shipyard employment, and construction OSHA issued guidelines for conducting inspections in workplaces with significant crystalline silica exposure 1996 OSHA issued a Special Emphasis Program (SEP) for Silicosis 1998 and 2003 OSHA identified crystalline silica as a focused hazard
28 Recognizing Hazards OSHA has a National Emphasis Program(NEP) for Crystalline Silica designed to: Significantly reduce/eliminate employee overexposure to crystalline silica Control the health hazards associated with such exposure Provide outreach and compliance assistance to employers
29 Recognizing Hazards OSHA requires products containing respirable silica to have Safety Data Sheets (SDSs) that identify health hazards. A product containing >=0.1% crystalline silica must have a SDS Packages for products containing respirable silica must also be properly labeled to identify hazards
30 Recognizing Hazards Inhaling silica dust can have both acute and chronic health effects. Rule of Thumb: If dust containing silica is visible in the air, consider it to be hazardous.
31 How can silica hazards be controlled?
32 Eliminating Hazards Evaluate and document engineering, administrative and other controls as well as work practices intended to reduce exposure to respirable crystalline silica. Eliminating loose absorbents that contain silica is one easy step that can be taken in manufacturing facilities
33 Engineering and Administrative Controls Local exhaust ventilation Tools with dust-collecting systems Substitute less hazardous materials for free silica Use wet methods when grinding, sanding or otherwise creating free silica dust Process isolation (e.g., control room, enclosures, blasting cabinets or barriers)
34 Engineering and Administrative Controls Use of HEPA-equipped vacuums or wet sweeping for cleaning Provide warning labels on machines used for blasting, grinding, etc. Attach warning labels to all products containing >= 0.1% crystalline silica and ensure that the label is not defaced or removed Dust should be vacuumed from clothing contaminated with silica, not blown or shaken
35 Engineering and Administrative Controls Contaminated surfaces should not be blown clean with compressed air or other forced air Do not allow workers to eat, drink, smoke or apply cosmetics in areas where crystalline silica dust is present provide separate, silica-free break areas for consuming food and beverages Provide exposure monitoring, health screening and surveillance programs to monitor any adverse health effects
36 Respiratory Protection NIOSH-Recommended Exposure Limit (REL) for respirable crystalline silica is 50 µg/m3 When engineering and administrative controls are not sufficient to meet the REL, respiratory protection is necessary to help protect workers
37 Respiratory Protection OSHA specifies the use of respiratory protection with at least a N95 filter efficiency. NIOSH recommends the use of half-facepiece particulate respirators with N95 or better filters for airborne exposures to crystalline silica at concentrations less than or equal to 0.5 mg/m3.
38 Respiratory Protection Respirators: Must fit properly Must be fit-tested Must be able to maintain a tight seal May not be worn with beards Require training on donning/doffing/care/replacement Should not be altered in any way
39 Encouraging Safety Employers are responsible for making their employees aware of hazards and controls. Workers have a responsibility to protect themselves: Become informed Use respirators when needed Participate in medical screenings Practice good personal hygiene in the workplace
40 Thank You New Pig PIG and the PIG logo are trademarks in the U.S. and other countries.
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