Residual Solvent Testing

Cannabis concentrates are often produced using chemical solvents to extract cannabinoids and terpenes from plant material. While these solvents are typically removed during processing, residual amounts can remain in finished products. Many solvents are harmful when inhaled or ingested, making thorough testing essential.

Solvents We Analyze

Our laboratory tests for 17 organic solvents commonly used in cannabis extraction and processing:

  • Hydrocarbon solvents: Butane, propane, pentane, hexane, heptane
  • Alcohol solvents: Ethanol, methanol, isopropanol
  • Polar solvents: Acetone, ethyl acetate
  • Aromatic solvents: Benzene, toluene, xylenes
  • Chlorinated solvents: Chloroform, dichloromethane, trichloroethylene
  • Cyclic hydrocarbons: Cyclohexane

Different Limits by Intended Use

Minnesota establishes separate action limits for edible products versus inhalable products. Inhalable products have much stricter limits because inhaled solvents are more readily absorbed and pose greater health risks. Our gas chromatography methods with headspace sampling can detect these volatile compounds at very low concentrations.

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    Solvent Disclosure Required

    Manufacturers must disclose all solvents used during extraction and processing through the statewide monitoring system. This ensures appropriate testing is performed and allows assessment of novel solvents not yet on the standard testing list.

    Class 1 Carcinogens

    Benzene, chloroform, and trichloroethylene are classified as known carcinogens with extremely low action limits (1-2 ppm for edibles, 1 ppm for inhalables). Even trace contamination can cause product failure.

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