Respirable crystalline silica means the mass fraction of inhaled crystalline silica particles penetrating to the unciliated airways. The respirable convention, which is a target specification for sampling instruments, is defined according to § 5.3. of European Standard EN 481 Workplace Atmospheres - Size fraction definition for measurement of airborne particles.

Respirable crystalline silica means quartz, cristobalite, and/or tridymite contained in airborne particles that are determined to be respirable by a sampling device designed to meet the characteristics for respirable-particle-size-selective samplers specified in the International Organization for Standardization (ISO) 7708:1995: Air Quality – Particle Size Fraction Definitions for Health-Related Sampling. The definition in the rule is very similar to the proposed definition with one modification. OSHA changed the wording from “means airborne particles that contain quartz, cristobalite, and/or tridymite and whose measurement is determined by a sampling device. . .” to “means quartz, cristobalite, and/or tridymite contained in airborne particles that are determined to be respirable by a sampling device. . .” to make it clear that only that portion of the particles that is composed of quartz, cristobalite, and/or tridymite is considered to be respirable crystalline silica.

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Note: Respirable crystalline silica levels in some areas, such as sand towers or traps under the shakeout operations in foundries or areas where employees are performing abrasive blasting, may be so high that any exposure could reasonably be expected to be in excess of the PEL.
Respirable crystalline silica has been associated with the lung disease, Silicosis.• Unless adequately controlled, cutting, drilling or hammering of hardened/dry concrete can project particles at high velocity with consequent risk of impact damage and/or injury, particularly to exposed areas of the body and eyes.

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Silica means silicon dioxide (occurring in crystalline, amorphous and impure forms), silica particles, silica dust or silica compounds.
High global warming potential hydrofluorocarbons means any hydrofluorocarbons in a particular end use for which EPA’s Significant New Alternatives Policy (SNAP) program has identified other acceptable alternatives that have lower global warming potential. The SNAP list of alternatives is found at 40 CFR part 82, subpart G, with supplemental tables of alternatives available at (http://www.epa.gov/snap/ ).
Hydrofluorocarbons means compounds that only contain hydrogen, fluorine, and carbon.
Polystyrene foam adhesive means an aerosol adhesive designed to bond polystyrene foam to substrates.
Airborne radioactive material means any radioactive material dispersed in the air in the form of dusts, fumes, particulates, mists, vapors, or gases.
Negative pressure respirator (tight fitting) means a respirator in which the air pressure inside the facepiece is negative during inhalation with respect to the ambient air pressure outside the respirator.
Corrosion inhibitor means a substance capable of reducing the corrosivity of water toward metal plumbing materials, especially lead and copper, by forming a protective film on the interior surface of those materials.
Disposable respirator means a respirator for which maintenance is not intended and that is designed to be discarded after excessive breathing resistance, sorbent exhaustion, physical damage, or end-of-service-life renders it unsuitable for use. Examples of this type of respirator are a disposable half-mask respirator or a disposable escape-only self-contained breathing apparatus (SCBA).
Brachytherapy means a method of radiation therapy in which sealed sources are utilized to deliver a radiation dose at a distance of up to a few centimeters, by surface, intracavitary, or interstitial application.
Diatomaceous earth filtration means a process resulting in substantial particulate removal in which a precoat cake of diatomaceous earth filter media is deposited on a support membrane (septum), and while the water is filtered by passing through the cake on the septum, additional filter media known as body feed is continuously added to the feed water to maintain the permeability of the filter cake.
Tissue means a portion of the human body other than an organ or an eye. The term does not include blood unless the blood is donated for the purpose of research or education.
Low-level radioactive waste or “waste” means radioactive material that consists of or contains class A, B, or C radioactive waste as defined by 10 C.F.R. 61.55, as in effect on January 26, 1983, but does not include waste or material that is any of the following:
Biological Samples means any physical samples obtained from Study Participants in accordance with the Protocol for the purposes of the Study.
Iatrogenic infertility means an impairment of fertility by surgery, radiation, chemotherapy, or other medical treatment affecting reproductive organs or processes.
Air-purifying respirator means a respirator with an air-purifying filter, cartridge, or canister that removes specific air contaminants by passing ambient air through the air-purifying element.
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Grab sample means an individual sample collected in less than 15 minutes in conjunction with an instantaneous flow measurement.

Respirable crystalline silica definition

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