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View PTP General Instructions    Elemental Analysis of Oils by ICP or RDE     Elemental Analysis of Lube Oil by XRF     Kinematic Viscosity Analysis of Petroleum Products     Leab (Pb) in Gasoline by XRF     Sulfur Analysis of Petroleum Products
 
Frequently Asked Questions aboutPerformance Testing
VHG's Proficiency Testing Program (PTP)

The Proficiency Testing Program from VHG Labs has been specially designed to verify the performance of analytical testing laboratories. The PTP provides a method for monitoring the lab's analytical performance against Certified Reference Materials (CRM's).

We have developed an entirely modern, internet based system that features prompt response to your analytical results. VHG's PTP has an "Open" format so you may purchase Proficiency Testing samples and submit your results anytime you want. You will receive a report with pass/fail results that is compliant with ISO 17043 within 2-3 days.

VHG's Proficiency Testing samples include:


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  • Elements in Oil by ICP or RDE
    Analyze the sample for up to 23 common elements by ICP-OES (ASTM D5185) or RDE-AES (ASTM D6595) and report the concentrations in µg/g (ppm). You may enter all elements or only those that you are interested in.
  • Elements in Lube Oil by XRF
    Analyze the sample for up to 9 common elements by XRF and report the concentrations in µg/g (ppm). You may enter all elements or only those that you are interested in.
  • Kinematic Viscosity in Oil
    Analyze the sample for kinematic viscosity at 40°C and/or 100°C and report the results in mm2/s (cSt).
  • Lead (Pb) in Isooctane by XRF
    Analyze the sample for lead (Pb) by XRF (ASTM D5059) and report the concentrations in g/gal.
  • Particle Count (for ISO 11171 only)
    Analyze and report the cumulative number of particles per mL for particle diameters >4µm, >6µm, >8µm, >14µm, >21µm, >38µm, >50µm and >70µm.
  • Sulfur (S) in Petroleum Products
    Analyze the sample for ultra-low sulfur (S) in one of five matrices (#2 Diesel Fuel, Biodiesel, Crude Oil, Isooctane, or Mineral Oil) and report the concentration in µg/g (ppm).