Case Studies: Case Studies – Materials Characterization

Test Chamber Simulation Studies Confirm Respirator Effectiveness for Airborne Coal Dust

A number of personal injury claims asserted that NIOSH-approved respirators worn by coal miners were tested using silica dust and therefore were not effective for miners exposed to airborne coal dust. The NIOSH method evaluated the performance of air-purifying respirators according to Title 30, Part 11 of the Code of Federal Regulations. A law firm ...
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Failure Analysis Determines Faulty Workmanship to be Cause of Defective Building Materials

RJ Lee Group's petrographic scientists used in-house laboratory capabilities to prove that poor workmanship—rather than faulty materials—was the cause of delamination and cracking in stucco used in a residential construction project.
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Product Failure Analysis: Consumer Product Affected by Inappropriate Raw Material

When homeowners issued complaints about staining on roofing shingles, the manufacturer took action. Through a full-scale forensic investigation, RJ Lee Group determined the source of failure and maintained the client's reputation.
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Establishing the WTC Dust Signature: Managing Post 9/11 Environmental and Damage Assessments

RJ Lee Group served as the lead scientific management team, collecting and processing more than 100,000 samples over a three-year period — the most comprehensive environmental impact study ever performed in Class-A building structures.
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Industrial Plants Can Face Costly Nuisance Dust Claims

RJ Lee Group was retained by an industrial plant to investigate — and ultimately refute — nuisance dust claims. We issued an expert report and provided supporting data and a deposition testimony.
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Experts Distinguish Corrosive Property Damage from Normal Deterioration

When 60 tons of chlorine gas were released in a catastrophic event, RJ Lee Group was called in to assess more than 360 property locations and 500 vehicles. Our expert testimony ultimately helped to refute unsubstantiated damage claims in the surrounding area.
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Maintaining FDA Approval: Substitute Material

RJ Lee Group helped a client demonstrate that a change in source materials would not affect patient safety or product performance. Ongoing FDA approval was granted without the need for costly re-resting and re-submission.
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Manufacturer of Fire Resistive Materials Needs Materials Performance Answers

When a manufacturer uses materials from different sources, it can impact final product consistency. By evaluating a client's raw materials for deviations and variation, RJ Lee Group helped increase supply sources and reduce material costs.
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Uncovering an Art Treasure’s Hidden Secret

An art collector, who owned a painting purchased by a family member from an art gallery in Europe just before the German invasion of Paris, contacted RJ Lee Group to determine when the painting had been created. The painting was signed by a well-known early 20th century artist and was true to the artist’s style, but it was not listed in the artist’s portfolio of known works. The owner wanted to determine if the painting could be the work of this artist based on its age. Our mission was to establish a timeframe in which the painting could have been created by investigating the pigments and other materials used and examining the construction of the painting.
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Improving the Recovery Process by Defining Simulant Composition for Hazardous Waste

RJ Lee Group designs a program that determines the compositional mix of waste byproducts of our national defense plutonium in order for it to be turned into a more stable, usable glass form.
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Analyses Reveal Viaduct Concrete Failure Not Consistent

RJ Lee Group was retained to provide information on the current state of the concrete, failure analysis, and an estimation of service life for a viaduct on a main north-south highway that handled approximately 75,000 vehicles a day.
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