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We provide testing services to certify product and materials compliance, support quality control, and ensure the health and safety of workers and their environment. We provide assistance for clients who are not sure what tests they need. Our accredited materials characterization laboratory is the foundation of all the services of RJ Lee Group provides, including standardized testing for compliance, industrial hygiene and environmental analyses, quality control, and materials research and development.

We provide credentialed expertise supported built by robust scientific data. We provide significant support to industrial clients for product development, industrial hygiene and overall production support.

RJ Lee Group maintains a visible and respected reputation within the legal community, having offered scientific support in civil litigation matters for nearly 30 years. 

  • Product Liability 
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Subject Matter Experts

From our core business of providing scientific solutions to our clients, we have developed innovative products. Some are produced internally, and some have arisen from partnerships with other research organizations. 

For example, we build lab software solutions to help manage and streamline your labs data, and environmental testing products for a variety of applications. 

  • IntelliSEM is a powerful automated particle analysis system.
  • ParticleID is  a customizable cloud hosted web application used to identify foreign particulate matter and  assist with root cause investigations. 

Other products we create count particles and help keep the air and environment safe.

RJ Lee Group is a materials analysis laboratory and consulting company which serves many different industries. We offer scientific solutions such as industrial forensics services, laboratory and testing services, litigation support, and laboratory software to many industries:

How Raman Spectroscopy Identifies the Polymorphs of Silica (SiO2)

RJ Lee Group News

September 2, 2015

Article on crystalline silica by Mark Sparrow, an expert in Raman Spectroscopy analysis, electron and optical microscopy, EDS, FTIR spectroscopy, thermal methods and mercury porosimetry.

Why is it Important to Identify the Polymorphs of Crystalline Silica?

Silicon dioxide, or crystalline silica, is one of the most common minerals on earth and is mostly obtained by the mining and purification of quartz.

It is also a major constituent of sand. Silica is used in the production of glass, optical fibers for telecommunication, and as a raw material for many ceramics. Silica’s high melting point makes it ideal as mold material (sand casting) in the manufacture of metal components. While most of the forms of silica are harmless to our health, crystalline silica dust particles become small enough to be inhaled when finely divided, and can be hazardous.

In addition to the size of the particles, whether or not a particle is hazardous depends on its polymorph of SiO2. There are four SiO2 polymorphs: quartz, cristobalite, tridymite, and moganite in addition to amorphous SiO2, so it is important to be able to distinguish these different forms. One of the few techniques that can accurately identify the different forms of crystalline silica is Raman spectroscopy.

What is Different about Raman Spectroscopy?

Raman spectroscopy provides rapid and reliable identification of SiO2 polymorphs with little or no sample preparation–benefits that assist industry in providing accurate quality assurance, process control and formulation. We can easily identify the SiO2 polymorphs by providing a direct correlation between the spectra (signature “fingerprint”) generated and the polymorph structure.

Figure 1. Raman spectra of silica polymorphs and an example spectrum of an amorphous silica for crystalline silica article

Figure 1. Raman spectra of silica polymorphs and an example spectrum of an amorphous silica

They each have very different signatures. Sample analysis is easily achieved by simply depositing the mineral powder sample in question onto a suitable substrate. The powder particles are located using edge detection, then they are automatically scanned by the Raman. The resultant spectra are compared to the spectra in Figure 1 to determine the correct polymorph. Particles that match up to the spectra of interest can then be flagged for further investigation.

For more information on Raman Spectroscopy, please call us at 1.800.866.1775 or click below.

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