Testing Services: Contaminants (gravimetric)

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Method	Test	Test Details	Volume	Price ($US)
D 381	Solvent-washed Gum Content	D 381 / Solvent-washed Gum Content The D381 Washed and Unwashed Gum Content measures the amount of gum residues present in the fuel. Gums are varnish-like oxidation products that can cause sticking and plugging of moving fuel components. This test is most appropriate for gasoline, ethanol, gasoline blends, and aviation fuels. The D6217 and D7321 methods are better suited for diesel, biodiesel, and diesel blends.	75 mL	$46.00
D 381	Unwashed Gum Content	D 381 / Unwashed Gum Content The D381 Washed and Unwashed Gum Content measures the amount of gum residues present in the fuel. Gums are varnish-like oxidation products that can cause sticking and plugging of moving fuel components. This test is most appropriate for gasoline, ethanol, gasoline blends, and aviation fuels. The D6217 and D7321 methods are better suited for diesel, biodiesel, and diesel blends.	75 mL	$46.00
D 482	Ash	D 482 / Ash The D482 Ash method determines the non-combustible material in a fuel such as metallic deposits. Significant ash content can cause engine deposits and excessive engine wear. The D482 method is appropriate for diesel and diesel blends (B6 to B20); the D874 Sulfated Ash method is appropriate for biodiesel.	100 mL	$45.00
D 482	Ash (for glycerin)	D 482 / Ash (for glycerin) The D482 Ash method determines the non-combustible material in a fuel such as metallic deposits. Significant ash content can cause engine deposits and excessive engine wear. The D482 method is appropriate for diesel and diesel blends (B6 to B20); the D874 Sulfated Ash method is appropriate for biodiesel.	50 mL	$55.00
D 524	Ramsbottom Carbon Residue	D 524 / Ramsbottom Carbon Residue The D524 Ramsbottom Carbon Residue method measures the amount of carbonaceous material after evaporation and pyrolysis of the sample. This will give a relative indication of coke-forming ability. This method is appropriate for diesel and diesel blends.	120 mL	$94.00
D 874	Sulfated Ash	D 874 / Sulfated Ash The D874 Sulfated Ash method determines the non-combustible material in a fuel such as metallic deposits. Significant ash content can cause engine deposits and excessive engine wear. The D874 method is more sensitive to ash formation from sodium and potassium and is therefore more appropriate for biodiesel; the D482 Ash method is appropriate for diesel and diesel blends (B6 to B20).	100 mL	$51.00
D 4530	Carbon Residue	D 4530 / Carbon Residue The D4530 Carbon Residue method measures the amount of carbonaceous material after evaporation and pyrolysis of the sample. This will give a relative indication of coke-forming ability. This method is more commonly used with biodiesel samples.	5 mL	$37.00
D 6217	Total Particulates (Diesel)	D 6217 / Total Particulates (Diesel) The D6217 Total Particulates method uses filtration to measure the total contamination by mass in diesel and diesel blends. The D7321 Particulate Contamination method is more suitable for biodiesel (B100). These filtration methods are typically not suitable for gasoline and gasoline blends; the D381 Gum Content is a better method for these fuels.	500 mL	$46.00
D 7321	Total Contamination (Biodiesel)	D 7321 / Total Contamination (Biodiesel) The D7321 Total Contamination method uses filtration to measure the total contamination by mass in biodiesel. The D6217 Total Particulates method is more suitable for diesel and diesel blends. These filtration methods are typically not suitable for gasoline and gasoline blends; the D381 Gum Content is a better method for these fuels.	500 mL	$46.00

*Our goal is to provide results for standard samples within 72 hours of receipt of sample, and RUSH service within 24 hours for most tests. Turnaround time goals reflect normal business hours of 8am-4pm Monday through Friday, excluding weekends and observed holidays. RUSH service is available at 2X normal price. For RUSH service, please contact us ahead of time to reduce any delays.

**Prices are valid December 31, 2024 - February 28, 2025

***Testing prices performed by an outsource laboratory are subject to change without notice.