FRAC Sand Lab Services

The Lonquist Sand Lab provides frac sand testing services to the oil and gas industry meeting American Petroleum Institute (API) and International Organization of Standardization (ISO) standards. It is capable of testing and analysis on both raw sand samples from the field and refined product ready to pump.  The Lab prides itself on quick turnaround and even "test before you pump" validation. All testing is supervised by a registered professional engineer (PE).

API/ISO Tests include:

Sieve Analysis

A series of sieves are used to confirm sand size and provide further detail on size distribution, mean and median particle size, etc. To meet API standards, 90% of the sample should fall within the advertised mesh size.

Sphericity & Roundness Assessment

Detailed Krumbien Shape Analysis is used to determine particle sphericity and roundness. Sphericity is a measure of how close a particle approaches the shape of a sphere. Roundness is a measure of the relative sharpness of corners or of curvature. To meet API standards, particle sphericity and roundness should both be 0.6 or higher.

Acid Solubility

Acid solubility testing determines the amount of non-silica contaminants in the sample which comes into play when the proppant can come into contact with acids.


Turbidity tests measure an optical property of a suspension that results from the scattering and absorption of light by the particulate matter suspended in a wetting fluid. In this case, the test gives an idea of the amount of clay, silt or other finely divided matter present in the sand sample. To meet API standards, turbidity should measure out to 250 FTU or less for frac sand.

Bulk Density

Bulk density is determined to understand the mass of sand that fills a unit volume - something important to consider when determining the mass of a proppant needed to fill a fracture.

Crush Testing

The Crush Resistance K-Value is the highest stress level at which proppant generates no more than 10% fines. Testing is performed at multiple stresses to determine this value. Additionally, crush resistance can be tested at a single closure stress to determine the percent fines at your target stress.

Other Testing:

Computerized Particle Analysis (CPA)

CPA technology analyzes all particles in a small sample providing detailed size and shape distribution.

XRD Analysis

X-ray diffraction (XRD) analysis provides information on bulk mineralogy of sand samples (i.e. what constitutes the frac sand other than silica/sand).