Lubricants, industrial oils and related products (class L) - Family H (Hydraulic systems) - Specifications for hydraulic fluids in categories HETG, HEPG, HEES and HEPR
1Key Takeaways
This international standard specifies the requirements for environmentally friendly hydraulic fluids and is applicable to fluids used in hydraulic systems, in particular hydraulic power systems. Its purpose is to provide guidance to suppliers and users as well as original equipment manufacturers. This international sta…
2Expert Interpretation
This article provides an in-depth analysis of the ISO 15380:2016 standard's technical requirements for four environmentally friendly hydraulic fluids: HETG, HEPG, HEES, and HEPR. This includes information on biodegradability, ecotoxicity, and physical and chemical indicators. It also provides guidance on mineral oil conversion and industry application recommendations.
Standard Overview
The third edition of ISO 15380:2016 replaces the 2011 version and sets specifications for four environmentally friendly hydraulic fluids: HETG (triglycerides), HEPG (polyethylene glycol), HEES (synthetic esters), and HEPR (polyalphaolefins). The standard emphasizes biodegradability (≥60% after 28 days) and low ecotoxicity (LC50 for fish/daphnia ≥100 mg/l), making it suitable for hydraulic systems where leakage is a concern.
Core Technical Requirements
| Test Items | HETG | HEPG | HEES | HEPR |
|---|---|---|---|---|
| Base Oil Content | ≥70%(m/m) | |||
| 40℃ Viscosity Range (mm²/s) | 19.8-74.8 | 19.8-74.8 | 19.8-110 | 19.8-74.8 |
| Flash Point (℃) | 165-195 | 165-195 | 165-205 | 165-195 |
| Copper corrosion (100℃/3h) | ≤Level 2 | |||
Environmental behavior requirements
The standard evaluates environmental performance through three key tests:
- ISO 14593/9439 Biodegradation Test (CO₂ Evolution Method)
- ISO 7346-2 Fish Acute Toxicity Test
- ISO 6341 Daphnia Acute Toxicity Test
Note: Fluids with low water solubility require a water phase compatibility test according to ISO 10634.
Implementation Recommendations
System Conversion Guide
Special attention should be paid when switching from mineral oil:
- Zinc/Lead Material: Avoid using pure zinc-plated filters
- Seal Compatibility: NBR/HNBR rubber testing (1000-hour aging) is recommended
- Residue Control: Target residue ≤2%, requiring multiple flushing
Maintenance Points
HEES oils require monitoring of acid value changes (TOST test ΔTAN ≤ 2mgKOH/g). It is recommended to replace the filter 50 hours after the first oil change.