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Classifying Matter by Composition03:35

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A composite body is a body made up of multiple parts, connected to form a larger, unified object. Each part has its own weight and center of gravity, which must be considered to determine the center of gravity of the composite body. In cases where the density or specific weight is constant, the center of gravity coincides with the centroid.
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Water functions as a solvent accommodating various solutes, which can be categorized under electrolytes and non-electrolytes. Non-electrolytes are usually held together by covalent bonds, restricting them from dissociating in solution, thereby leading to a lack of electrically charged components upon dissolving in water. They are predominantly organic molecules, such as glucose, creatinine, and urea. Electrolytes, on the other hand, are compounds that can break down into ions in water.
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Experimental Implementation of a New Composite Fabrication Method: Exposing Bare Fibers on the Composite Surface by the Soft Layer Method
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The Composition of Emissions from Sawing Corian®, a Solid Surface Composite Material.

Seungkoo Kang1, Huayan Liang1, Yong Qian2

  • 1Division of Applied Research and Technology, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, MS: Cincinnati, OH, USA.

Annals of Work Exposures and Health
|March 11, 2019
PubMed
Summary

Sawing Corian® releases respirable dust, primarily alumina trihydrate, and volatile methyl methacrylate (MMA) vapor. Understanding these emissions is crucial for workplace safety when processing solid surface materials.

Keywords:
Corian®VOCsalumina trihydraterespirable dustsolid surface composite

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Area of Science:

  • Materials Science
  • Occupational Health
  • Environmental Science

Background:

  • Corian® is a widely used solid surface composite material.
  • Sawing composite materials can generate airborne contaminants.
  • Understanding the composition of these emissions is vital for assessing health risks.

Purpose of the Study:

  • To analyze the composition of emissions generated from sawing Corian®.
  • To quantify the generation rates of respirable dust, volatile organic compounds (VOCs), and semivolatile organic compounds (SVOCs).
  • To identify the primary chemical constituents of the airborne particles.

Main Methods:

  • Laboratory-based sawing of Corian®.
  • Size-selective sampling of airborne dust using a Micro-Orifice Uniform Deposit Impactor.
  • Analysis of aluminum content, SVOCs, and VOCs in collected samples.
  • Gas chromatography-mass spectrometry for compound identification and quantification.

Main Results:

  • The normalized respirable dust generation rate was 5.9 mg/g (0.59% of removed mass).
  • Alumina trihydrate constituted over 85% of the respirable dust composition.
  • Methyl methacrylate (MMA) was the most abundant VOC, with a generation rate of 6.9 mg/g (0.69% of removed mass).
  • SVOC analysis detected only a small amount of MMA (0.55%) in the bulk dust.

Conclusions:

  • Sawing Corian® primarily generates alumina trihydrate dust and methyl methacrylate vapor.
  • The findings confirm alumina trihydrate as the dominant component of airborne particles, including ultrafine particles.
  • These emissions data are essential for developing effective exposure control strategies in occupational settings.