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Testing that Reaches the World

Particle Characterization

Clark’s particle testing services, combined with our analytical chemistry testing, allow our customers to benefit from one resource for material analysis: both chemical and physical properties.

We provide such testing services to industries including: Agriculture, Medical/Pharma, Food & Beverage, Electronics, Energy, Primary Metals, and Heavy Industry. Materials include: catalysts, aluminas, propellants, ceramics, filters, cements, adsorbents, activated carbon, carbon black, paints/coatings, medical implants, electronic components, cosmetics, nanotubes, and many more.

We routinely provide the following physical property tests, based on particle characteristics:

Particle Size Testing:

In general, there are 7 properties which Particle Size has a direct affect: texture, appearance, effectiveness, sedimentation, packing density, dissolution, and reaction. Therefore, Particle Size plays an important role in formulation.

  • Particle Size Distribution by Laser Light Scattering
  • Particle Count
  • Sieve Analysis

Density Testing:

Density is the mass of a substance with regard to the space in which it occupies. It is important to determine the density when there are changes in vendor materials or in processing.

  • Apparent Density
  • Bulk Density
  • Tap Density

Surface Area Testing

Important in the formation, structure, and potential use of a material, Surface Area is a common test.

Surface Area is measured by the static volumetric method using nitrogen. The material is first out-gassed using heat and/or vacuum to remove any impurities. After being cooled with liquid nitrogen, the volume of gas adsorbed is measured at varying pressures. Analysis follows the B.E.T. (Brunauer, Emmet, and Teller) Theory.

Testing may be processed as Single Point Surface Area or BET Surface Area.

Porosimetry Testing:

Porosimetry testing is used to determine the porous nature of a material which includes pore size, volume, distribution, density, and other porosity characteristics. Porosity is important to the formation, structure, and use of various materials.

  • Nitrogen Absorption
  • Mercury Intrusion/Extrusion

Our new Horiba LA-960v2 has a measuring range of 10nm to 500µm and is capable of accurately measuring NIST-traceable size standards within 0.6% of specification.

Michelle Felicetti, General Manager, Clark Laboratories