ISO 9950 — Industrial Quenching Oils Cooling Curve Standard
The foundational international standard for ranking the cooling behaviour of industrial quenching oils.
What is ISO 9950?
ISO 9950:1995(E) — officially titled "Industrial quenching oils — Determination of cooling characteristics — Nickel-alloy probe test method" — is the original, internationally recognised benchmark for measuring the cooling behaviour of industrial quenching oils under still (non-agitated) conditions.
Published by the International Organization for Standardization, this standard defines the reference test procedure adopted by quench oil manufacturers, heat-treatment laboratories, and metallurgical facilities worldwide. It forms the technical foundation upon which ASTM D6200 and subsequent standards are built.
The primary purpose of ISO 9950 is the comparison of quenching oils against each other and against a reference fluid, not absolute prediction of cooling rates in industrial agitated tanks. By maintaining consistent test conditions, laboratories across continents produce directly comparable results.
Apparatus & Key Specifications
ISO 9950 mandates the following apparatus — all requirements are met by ProVaC's Pro-Quenchometer platform.
Reported Parameters
ISO 9950 requires the following parameters to be calculated and reported for each test run. ProQuench software computes all of these automatically.
Reference Fluid Limits
These acceptance limits must be met when testing the calibration reference fluid — verifying equipment and probe are within specification.
How ProVaC Enables ISO 9950 Compliance
Every aspect of ISO 9950 is directly addressed by ProVaC's Pro-Quenchometer, Inconel Probes, and ProQuench V3 software.
Probe Geometry Verified
ProVaC's Inconel probes are precision-machined to the exact 12.5 mm × 60 mm geometry with NABL-traceable Type K thermocouple placement — zero deviation from ISO 9950 requirements.
Sub-2-Second Automated Transfer
The Pro-Quenchometer's world-first automatic probe transfer mechanism completes transfer within 3 seconds (faster than manual operators), meeting the ISO 9950 ≤2-second requirement reliably every test.
All Six Parameters Auto-Calculated
ProQuench software automatically computes CRmax, T(CRmax), CR300, Time600, Time400, and Time200 per ISO 9950, with professional PDF report generation.
Reference Fluid Validation Built-In
ProQuench includes ISO 9950 Wolfson reference fluid limits as pass/fail acceptance criteria — instantly flagging out-of-spec calibration runs.
Triplicate Test Logging
ISO 9950 requires triplicate testing. ProQuench automatically logs and averages triplicate runs, stores historical data, and flags statistical outliers.
Ready to Achieve ISO 9950 Compliance?
ProVaC's Pro-Quenchometer is precision-engineered to meet every requirement of ISO 9950:1995(E). Talk to our quenching technology experts for a tailored compliance solution.