A lubricant buyer cannot audit a formulation. What they can audit is whether someone with no commercial interest has already tested it — a pump maker, a gearbox maker, a state laboratory, or a steel mill that runs the oil in production.
Each one below is a real certificate, report or approval letter held by the plant, with its number and date. Copies are supplied with a supplier-qualification pack.
L-HM Ashless anti-wear hydraulic oil, ISO VG 32 / 46 / 68
The approval hydraulic OEMs and pump makers ask for first. HF-0 covers vane and piston pumps running at high pressure, and the ashless chemistry is what lets the oil work in steel-on-steel and steel-on-bronze pumps alike.
Parker Hannifin France SAS (Denison Hydraulics) · July 2019
PAO (Group IV) industrial gear oil, ISO VG 220–680
Tested to the FLENDER gear-unit specification Rev. 13, including FZG scuffing load stage (DIN ISO 14635-1), elastomer seal compatibility (ISO 6072) and FVA 54 micropitting resistance. This is the document that clears a gearbox warranty.
FLENDER GEAR UNITS (Siemens Mechanical Drives) · 27 February 2017
L-HM 46 anti-wear hydraulic oil
Independent verification of the numbers we print on the TDS — not a self-declaration. Useful when your customer wants a lab report with a name they recognise on it.
SGS-CSTC Standards Technical Services (Shanghai) · 15 June 2015
Hydraulic support concentrate HFAS 30-5 / 10-5 / 15-5; emulsion oil HFAE 30-5 / 10-5 / 15-5
Compulsory for hydraulic fluids used in Chinese coal mines, tested to MT/T 76-2011. It means the fire-resistant hydraulic fluid has passed a state lab, not just our own bench.
Anbiao — China mining products safety mark · current
Scans of the documents buyers ask for most often. Full copies go out with the supplier-qualification pack; ID numbers and personal signatures are masked in any document that carries them.
Routine production is released batch by batch against the properties on the left. Anything beyond that — FZG, micropitting, elastomer swell — is run during development or when a customer's specification calls for it.
We also run a simulation test centre in Shanghai for bench work on new formulations, and use fleet trials with a domestic transport operator when a long-drain claim needs field evidence rather than bench evidence.
Method numbers are listed so your own lab can compare results directly, rather than argue about whether two numbers were measured the same way.
| Test | Method | Run per batch |
|---|---|---|
| Kinematic viscosity @ 40 °C | GB/T 265 | Yes |
| Viscosity index | GB/T 2541 | Yes |
| Flash point, open cup | GB/T 3536 | Yes |
| Pour point | GB/T 3535 | Yes |
| Copper strip corrosion | GB/T 5096 | Yes |
| Rust protection, distilled water | GB/T 11143 | Yes |
| Demulsibility | GB/T 7305 | Yes |
| Oxidation stability | GB/T 12581 | On specification |
| FZG scuffing load stage | DIN ISO 14635-1 | On specification |
| Cleanliness / particle count | ISO 4406 | On request |
| Elastomer compatibility | ISO 6072 | Development only |
| Micropitting resistance | FVA 54 VI | Development only |
A Denison or FLENDER letter is issued to a legal entity, for named products and viscosity grades. Ask to see the letter, not the logo.
Read the scope line. "Filling of lubricating oil" is not the same as "design and manufacture", and an auditor will notice the difference.
An API licence has a number and is auditable. "Meets API CK-4 requirements" is a formulation claim. Both are legitimate; confusing them is not.
Not a specimen — an actual COA from a shipment, with the batch number and the measured values against the limits.
This is the question that decides whether a private-label relationship survives its second year.
Approvals in the plant's own name · scope stated exactly as printed · licensed/meets distinguished per grade · batch COA with every shipment · no house brand appointed in your territory.
Ask for the packTell us which documents the tender requires. We assemble the certificate set, the batch COA template and the SDS in one file.