01 / particles
Particle count testing
ISO 4406 particle count, NAS 1638 particle count, and NAS cleanliness testing from an oil particle count laboratory that turns raw counts into a clear cleanliness code.
Accredited industrial laboratory support · San Diego
Oil-analysis results in 6 hours—or your test is free.
United RS provides ISO/IEC 17025:2017 accredited industrial laboratory support without the usual wait. Once your sample reaches our San Diego lab, we deliver your results within six hours or the analysis is free. 24-hour service is available.
✓ Results within 6 hours
✓ 24-hour service available
✓ Shipping covered both ways
ISO/IEC 17025:2017 accredited
Accreditation No. 137081
Results guarantee
24-hour service
6
hours
from sample receipt
Miss the deadline? Your analysis is free.
ISO 4406
Water
Wear metals
Clear results you can act on today—not days from now.
ISO/IEC 17025:2017Accreditation No. 137081NASASTMSAEISOMIL-SPEC
/
[XX]+ yrs
6-hour results or it’s free
24-hour service available
Minutes from Naval Base San Diego
06:00
The United RS six-hour guarantee
Results within six hours of sample receipt—or the analysis is free.
When downtime cannot wait, ask about our 24-hour service.
Why oil analysis
Contamination is the number-one killer of hydraulic systems.
Most hydraulic and bearing failures start in the fluid: particles scoring surfaces, water breaking down additives, wear metals climbing long before anything sounds wrong. A scheduled analysis catches it while it’s still a line on a report, not a rebuild on the deckplate.
01 / particles
Particle contamination
Abrasive debris that scores pumps, valves and servo clearances. Measured as an ISO 4406 / NAS 1638 cleanliness code.
02 / water
Water ingress
Even trace water corrodes surfaces and strips additives. Caught at ppm by Karl Fischer titration.
03 / wear
Component wear
Rising wear metals point to the exact component failing, weeks before it seizes. Read by elemental analysis.
The analysis
Six tests. One picture of your fluid’s health.
Order the full panel or just the checks you need. Each result comes back against the governing standard, in plain pass / marginal / critical language.
Particle count analysis
ISO 4406 · NAS 1638Automatic particle counting that grades contamination as a cleanliness code, protecting pumps, valves and hydraulic systems.
Water contamination
Karl FischerDetects water down to ppm to head off corrosion and additive breakdown before it spreads through the system.
Oil condition & wear
ElementalIdentifies metal particles in the oil to monitor system wear and flag a failing component early.
Viscosity & density
ASTM D445Confirms the fluid still carries the load and lubricates the way the system was designed to run.
Flashpoint
ASTM D92/D93Pinpoints the ignition temperature to expose fuel dilution, cross-contamination and safety risk.
TAN / TBN analysis
Acid / baseTracks acidity and reserve alkalinity so you change oil on condition, not on a guess.
Testing and field support
One oil analysis laboratory for the lab and the jobsite.
United RS is a San Diego oil analysis lab providing lubricating oil analysis, hydraulic oil analysis, and hydraulic fluid testing for industrial, marine, and defense equipment. Use our accredited oil analysis laboratory for a single sample, a predictive program, or field support during flushing and commissioning.
02 / contamination
Hydraulic cleanliness
Oil contamination testing and hydraulic contamination analysis for fluid cleanliness testing, hydraulic system cleanliness testing, troubleshooting, and acceptance work.
03 / water & wear
Water and wear diagnostics
Karl Fischer water testing, water in oil testing, and ASTM D6304 testing pair with wear metal analysis and spectrometric oil analysis to expose contamination and component wear.
04 / condition
Condition monitoring services
Predictive maintenance oil analysis and machinery condition monitoring for diesel engine oil analysis, gearbox oil analysis, hydraulics, pumps, motors, turbines, and compressors.
05 / marine
Marine and NAVSEA support
Marine oil analysis, marine lubricant analysis, ship oil analysis, marine hydraulic oil testing, NAVSEA oil analysis, and fuel testing laboratory support for vessels and shipyards.
06 / field service
Flushing and onsite testing
Technical flushing services, hydraulic flushing services, lube oil flushing, NAVSEA flushing, and oil flushing company support, plus particle counter rental, portable particle counter support, and onsite particle count testing.
Not sure which test or field service you need?
Tell us the equipment, fluid, and problem. We’ll scope the fastest useful next step.
How it works
From sample to answer in three steps.
-
01
Request a quote
Tell us your equipment and what you need tested. We scope it and email your prepaid shipping label, usually the same day.
-
02
Pull and ship your sample
Fill a clean, dry sample bottle (about 4 oz / 120 mL). Not sure what to use? Ask and we’ll spec it. Drop it in with the prepaid label — we cover shipping both ways.
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03
Get your report and next step
Clear pass / marginal / critical results to NAS, ASTM, SAE, ISO and MIL-SPEC—plus what to do about it—within six hours of sample receipt or your analysis is free.
Why United RS
Accredited industrial lab support, on a West-Coast clock.
ISO/IEC 17025:2017 accredited
Accredited to ISO/IEC 17025:2017 under Accreditation No. 137081, with the technical competence and quality system serious industrial work demands.
Six hours, guaranteed
Your results are delivered within six hours of sample receipt or the analysis is free. 24-hour service is available when the job cannot wait.
Shipping covered both ways
You never pay to ship samples in or back. Request a quote and the prepaid label lands in your inbox.
Request a quote
Get your results today.
Tell us what you’re running and what you need tested. We’ll confirm the scope, arrange your sample, and put the six-hour guarantee behind your results.
- ✓ Shipping covered both ways
- ✓ Results to NAS / ASTM / SAE / ISO / MIL-SPEC
- ✓ ISO/IEC 17025:2017 accredited · No. 137081
- ✓ Results within 6 hours or the analysis is free
- ✓ 24-hour service available
Questions
Is United RS an accredited laboratory?+
Yes. United RS is accredited to ISO/IEC 17025:2017 under Accreditation No. 137081.
What sample container do I use?+
A new, clean, dry bottle around 4 oz / 120 mL works for most fluids. Not sure? Ask when you request your quote and we’ll spec the right bottle and volume for your equipment.
How fast are results?+
Within six hours of receiving your sample or your analysis is free. If your job is urgent, call us to arrange 24-hour service.
Do you offer 24-hour service?+
Yes. 24-hour service is available for urgent analysis. Call us so we can confirm timing and coordinate your sample.
Which standards do you test to?+
NAS, ASTM, SAE, ISO and MIL-SPEC, including ISO 4406 and NAS 1638 cleanliness codes.
Do you only serve San Diego?+
San Diego and Southern California are our fast-turn local zone. We also test mail-in samples from anywhere — and cover shipping both ways.