The current CAL-OSHA and federal OSHA standard that requires wet-cutting methods, exhaust ventilation, and dust masks, half-face canister respirators, and full-face canister respirators when fabricating natural stone was based on the low content of silica particles found in natural stone that are sized in the low micron range, and not the high volume of ultrafine or nanosized silica particles contained in engineered stone. As a result, the current OSHA standard does not provide adequate protection for the massive numbers of ultrafine and nanosized crystalline silica particles to which fabricators are exposed. For an analysis of the toxicological characteristics of engineered stone such as high concentration, ultrafine particles, irregular shapes, and volatile organic compounds (VOCs), and free radicalsa that cause severe silicosis see Why are the Particles Generated By Artificial Stone More Toxic Than Particles Generated By Natural Stone? – July 20, 2023 by Michael Wilson, Ph.D, MPH, CIH at CAL-OSHA.


防尘口罩 半脸呼吸器 全脸呼吸器

Required Respiratory Protection for Artificial Stone Fabrication Workers

  • Working without a mask does not prevent disease.
  • N-95 masks do not prevent disease.
  • A half or full-face elastomeric OV (organic vapor)/P-100 cartridge filter respirator will reduce, but not prevent disease. Also, note that the cartridge/filters must be regularly replaced.
  • A Powered Air Purifying Respirator (PAPR) with an APF (Assigned Protection Factor) of 25/1000, if consistently used on conjunction with wet-equipment and no compressed air, should prevent most disease.
  • Supplied air respirators (SAR) with an APF (Assigned Protection Factor) of 1000, if consistently used on conjunction with wet-equipment and no compressed air, will prevent most disease.



视频来源:佐治亚理工学院的 SHES

研究表明,工程石制造车间的工人平均接触的二氧化硅浓度为 227 ug/m3,是 OSHA 许可接触限值 (PEL) 的 4.5 倍,是 OSHA 行动水平的 9 倍。在没有控制的情况下,暴露范围高达 2300 ug/m3,是 PEL 的 46 倍。即使使用 OSHA 控制方法,暴露范围也高达 360 ug/m3。换句话说,水通风和排气通风不会将二氧化硅暴露量降低到 OSHA 二氧化硅 PEL 以下。因此,能够完全预防疾病的唯一方法是使用全供气正压呼吸器,或者禁止生产和销售人造石。

动力空气净化呼吸器 佩戴正压空气呼吸器的人 使用正压供气呼吸器的人



While not as effective at disease prevention as an air fed positive pressure respirator or a complete ban, the CDPH (California Department of Public Health) – Occupational Health Branch maintains an updated website with Silica Safety Resources for Stone Fabricators and in Spanish at Fabricantes de Encimeras y Enfermedad Pulmonar.   The CDPH site includes:

The California Labor Lab and the University of San Francisco maintain an updated California Artificial Stone and Silicosis Project

The Texas Department of Health & Human Services – Silica Health Advisory maintains a worker health advisor – Worker Exposure to Silica Dust During Stone Countertop Fabrication – March 18, 2019

Georgia Tech’s Department of Safety, Health, & Environmental Services maintains training modules in English and Spanish for fabrication shop Control of Silica Exposure In Engineered Stone Fabrication Facilities

The U.S. Department of Labor – OSHA (Occupational Safety & Health Administration) has issued two respirable crystalline silica standards to protect workers.

OSHA and NIOSH have issued a Hazard Alert found at Worker Exposure to Silica during Countertop Manufacturing, Finishing, and Installation.   Artificial stone fabrication workers have a right to a safe workplace.  For information about OSHA worker rights and how to file a complaint with OSHA, see OSHA Worker Rights and Protections

The Western Occupational & Environmental Medical Association (WOEMA), has established the Silica Medical Exam Practitioner Roster, which is a list of medical facilities in California, Arizona, Utah, Nevada, and Hawaii which offer silicosis medical surveillance examinations for artificial stone workers.

与律师交谈 – 免费案例分析

Engineered stone (Quartz) (artificial) (manufactured) countertop workers, who have been diagnosed with silicosis or lung cancer, or believe they may have silicosis,  contact us online or call us at (855) 335-8606 for a no cost case analysis.  You may be entitled to monetary recovery.  Protect your rights.

For an overview of engineered stone, why it is dangerous, and how it causes silicosis and other diseases, click here

To learn about Safety and Medical resources, and how to reduce or eliminate exposure to silica, click here

To learn about what the manufacturers and distributors of engineered stone knew about the hazards of their products, click here

For an updated listing of current news, important regulatory hearings and medical presentations, and medical journal articles about the epidemic of engineered stone silicosis, click here

To learn about the types of monetary damages available to silicosis victims, statute of limitations (deadlines to file a lawsuit), or the major defendant manufacturers of engineered stone, click here