Chemical Measurement Division

Particulate and Gravimetric Services

Enthalpy provides gravimetric and chemical analysis for particulate matter (PM) test methods.

We support EPA methods ranging from "traditional" PM methods to evolving techniques for condensable particulate matter (CPM) and PM with diameters smaller than 2.5 microns (PM2.5).

With recent standards and test methods for PM2.5 and CPM consistently driving catch weights lower, testing and analytical procedures are receiving more attention. Enthalpy is meeting the new PM challenges with improved procedures, increased capacity, technology investment and training.

Since 1992, Enthalpy has performed thousands of gravimetric projects for the source testing industry. We continue to advocate for better testing methods, most recently contributing research toward resolving issues with EPA Method 202.



We're dedicated to delivering dependable PM data on schedule, whether for Method 5 or the latest methods for PM2.5 or CPM.

  • NELAC certified
  • Methods 5, 5F, 17, 201A, 202, CTM-039, OTM-27, OTM-028
  • Numerous state methods including NJATM1, GA5T, and California ARB procedures
  • Low catch weights
  • Low RSDs for Teflon baggies
  • Media supplies - tared glass fiber and Teflon filters
  • 6-place balance (Sartorius ME5-F)
  • Sulfate and chloride corrections by IC
  • Particulate R&D support for Method 202 and OTM-028