ISO 12152-2012 PDF

Full title and description

ISO 12152:2012 — Lubricants, industrial oils and related products — Determination of the foaming and air release properties of industrial gear oils using a spur gear test rig — Flender foam test procedure. This International Standard specifies a bench test procedure that uses a single-stage spur gear rig to evaluate foaming and air‑release behaviour of industrial gear lubricants under conditions intended to be close to real gearbox service.

Abstract

ISO 12152:2012 describes the Flender foam test: a procedure in which a spur gear pair runs in a sealed housing with a defined oil charge, then the drive is stopped and volume changes due to dispersed oil/air and surface foam are recorded over specified intervals. The method provides a comparative assessment of an oil’s tendency to foam and to release entrained air under near-real gearbox conditions.

General information

• Status: Published (confirmed in systematic review).
• Publication date: August 2012 (2012-08).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 75.100 (Lubricants, industrial oils and related products).
• Edition / version: Edition 1 (2012).
• Number of pages: 8.

Scope

The standard specifies a comparative laboratory test for industrial gear oils to determine foaming and air‑release behaviour using a single-stage spur gear test rig (Flender foam rig). It is intended for use when realistic gearbox-like shear and entrainment conditions are required for evaluation, development or quality control of gear lubricants. It does not purport to cover all aspects of in-service gearbox behaviour but provides repeatable data for formulation and selection decisions.

Key topics and requirements

• Test principle: run a pair of spur gears in a sealed gearbox housing with a defined oil charge and record volume/foam changes after stopping the drive.
• Test rig essentials: sealed ~2 L housing with vertically arranged shafts, front viewing window with % scale (0% set ≈1 L at 25 °C), heating, filling/draining and breather provisions.
• Operating conditions and timing: specified motor power and speed (e.g., ≳0.55 kW, ≈1 450 rpm), controlled test temperature (25 ± 0.5 °C), defined run time (≈300 s) and observation intervals up to 90 minutes for foam/air‑release measurements.
• Preparation and cleaning: rig flushing and conditioning procedures (use of cleaning solvent and pre-fill cycles) to ensure reproducible starting conditions.
• Measurements and reporting: record oil temperature and percentage volume increases for dispersed oil/air and surface foam; report results to defined precision; repeatability and reproducibility values are given for typical interlaboratory comparisons.
• Data handling: distinguish and plot oil–air dispersion versus surface foam as percentage volume increase over time for comparative analysis.

Typical use and users

Common users include lubricant formulators and R&D teams evaluating antifoam and air‑release performance; QC laboratories performing batch checks; gearbox and OEM engineers (e.g., wind‑turbine, industrial gearbox manufacturers) selecting lubricants; and research groups studying foaming mechanisms. The test is used for comparative formulation development, specification verification and product acceptance testing.

Related standards

Standards and documents commonly referenced alongside ISO 12152:2012 include ISO 6247 (glassware foaming tests for lubricating oils), ISO 12925‑1 (lubricant specification framework for enclosed gear systems), ISO 5725‑2 (accuracy — repeatability and reproducibility methods), and ASTM methods such as ASTM D892 (foaming) and reference materials or cleaning solvent specifications (e.g., ASTM D235 for mineral spirits used as cleaning fluid examples).

Keywords

Flender foam test, spur gear test rig, gear oils, lubricating oils, foaming, air release, lubricant testing, gearbox lubrication, ISO 12152:2012.

FAQ

Q: What is this standard?

A: ISO 12152:2012 is an international test method that defines the Flender foam spur‑gear rig procedure to evaluate foaming and air‑release behaviour of industrial gear lubricants in a bench test intended to simulate gearbox conditions.

Q: What does it cover?

A: It covers the test rig configuration, preparation, operating conditions, measurement intervals and reporting conventions for recording dispersed oil/air and surface foam as percentage volume increases; it provides repeatability/reproducibility guidance for comparative testing.

Q: Who typically uses it?

A: Lubricant formulators, quality‑control and independent test laboratories, gearbox/OEM engineers and research groups concerned with lubricant foaming and air‑release properties.

Q: Is it current or superseded?

A: The 2012 edition (Edition 1) is published and was confirmed in systematic review actions (confirmed in 2017 and again in 2022); as of the latest ISO record it remains the current, confirmed version. Users should check the national or ISO catalogue for any later revisions before relying on the standard for procurement or conformity purposes.

Q: Is it part of a series?

A: It sits within the ISO lubricant/industrial oils family of standards (ICS 75.100) and is used alongside other lubricant test methods and specification standards (for example ISO 6247, ISO 12925 series and relevant ASTM test methods) rather than being a numbered multi‑part series itself.

Q: What are the key keywords?

A: Flender foam test, spur gear rig, foaming, air release, gear oil, lubricant testing, ISO 12152, gearbox lubrication.