Accredited Diesel Fuel Quality Testing
AGT Labs provides diesel testing services from our Houston laboratory under PJLA accreditation to ISO/IEC 17025:2017 (Accreditation No. 118590). Our accredited diesel tests cover free water and particulate contamination, copper strip corrosion, electrical conductivity, density and API gravity, color, refractive index and carbon residue.
These results help transport fleets, backup power facilities, fuel distributors and marine operators confirm fuel cleanliness, detect contamination and verify product quality before fuel is used or transferred.
Accredited Test Parameters
Every diesel test listed below is on our PJLA ISO/IEC 17025 scope of accreditation (Certificate L25-276).
Free Water & Particulates
ASTM D4176Copper Strip Corrosion
ASTM D130Electrical Conductivity
ASTM D2624Density & API Gravity
ASTM D5002Color (Tristimulus)
ASTM D6045Refractive Index
ASTM D1218Ramsbottom Carbon Residue
ASTM D524Industries We Serve
Accredited diesel fuel data for industrial, power and transport operations.
Transport Fleets
Checking fuel for free water, particulates and corrosiveness to protect fuel systems and engines.
Backup Power Gen
Screening stored generator fuel for water and particulate contamination so emergency systems start when needed.
Marine & Offshore
Verifying marine gas oil cleanliness, density and copper corrosion before bunkering or transfer.
Fuel Distributors
Independent checks on bulk deliveries, including electrical conductivity for safe handling and density for custody records.
Construction & Mining
Identifying water and particulate contamination in field storage tanks to prevent heavy equipment downtime.
Terminals & Storage
Tank and batch quality checks using color, refractive index and carbon residue to flag contamination or off-grade product.
Laboratory Capabilities
Analytical Systems
Our laboratory uses digital density meters, conductivity meters, refractometers, automatic tristimulus colorimeters, copper strip corrosion baths and gravimetric carbon residue equipment, all operated under our ISO/IEC 17025 quality system.
Technical Support
- ISO/IEC 17025:2017 Accredited Laboratory Operations (PJLA No. 118590)
- Rapid Turnaround for Emergency Power Fuel Checks
- Contamination Investigations Using Accredited Methods
- Samples Accepted Nationwide at Our Houston Laboratory
Sampling, Handling & Chain of Custody
Reliable diesel results depend on sample integrity, especially preventing water ingress and contamination. Please ship samples in clean containers with a completed CoC.
Download Chain of Custody FormContainers & Handling
- Use certified clean containers; opaque bottles recommended to prevent light degradation.
- Take bottom, middle, and top samples from storage tanks to detect stratified water or sludge.
- Seal immediately to prevent external moisture or dust contamination.
Transport & Logistics
- Include accurate records of sampling location (tank bottom vs. nozzle) for technical interpretation.
- Expedited shipping to our Houston laboratory for urgent generator fuel checks.
- Samples stored in a cool environment per technical safety compliance standards.
Quality & Reporting
Our reports give clear, defensible data for audits, supplier disputes and internal quality records.
- COA with method references, results, and certified authorized signatory.
- Secure PDF delivery via our client portal.
- Measurement uncertainty available on request.
- Technical review of water, particulate and corrosion results.
Frequently Asked Questions
Which diesel tests are accredited at AGT Labs?
How fast can I get diesel results?
How do you check stored diesel for contamination?
Certify Your Fuel Reliability with Diesel Testing Services
Need accredited diesel testing in Houston or nationwide? Contact our technical team today for a custom analysis quote.
Contact Technical Specialist