Samples that drive quality

"I don’t think we would have the quality of the AB program that we do [without] having their involvement, maintaining the standard that we do. I think it’s helped us immensely."

New Hampshire Department of Transportation

Alan Rawson, Bureau of Materials & Research Administrator

55+ years of experience
PSP participants
samples shipped per year
laboratory assessments per year
accredited labs

Looking to submit data? Click here to submit.

Reminder: Please be sure to always include your PSP Enrollment number on your datasheet.

This enables us to properly identify your laboratory. We will be happy to assist you if you do not know your PSP Enrollment number. Please contact us at (240) 436-4900 or

Looking for a datasheet or instructions for a sample round that isn't listed below?

Instructions and Datasheets are not made available until a sample round's scheduled ship date. Visit the Proficiency Sample Schedule for more details.

Aggregate Degradation - AGD

Closing Date:

Amending Data After Submittal

If it is before the samples’ posted closing date, you may change/update the data previously submitted. Navigate to the “View Sample Round Result Confirmation” page as you would to initially submit your data. (This is the page you saw after you first submitted your results.) Click on the “Overwrite Data” button at the bottom of the page to make the desired changes.

If it is after the samples’ posted closing date and analysis has already begun, your data cannot be changed.