Reference number  
DRS 351: 2017  
 
© RSB 2017  
 
 RWANDA 
STANDARD  DRS 
351 
 
First edition  
2017 -mm-dd 
 
Lubricating oils for turbines  — 
Specification  
 
  DRS 351: 2017  
©RSB 2017  All rights reserved                  ii 
 
 In order to match with technological development and to keep continuous progress in industries, 
Standards are subject to periodic review. Users shall ascertain that they are in possession of the latest 
edition  
 
 
 
 
 
 
 
 
 
 
© RSB 2017  
All rights reserved. Unless otherwise specified , no part of this publication may be reproduced or utilized 
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Tel. +250 252 586103/ 582945  
Toll Free: 3250  
E-mail: info@rsb.gov.rw  
Website: www.rsb.gov.rw  DRS 351: 2017  
iii                 ©RSB 2017  All rights reserved  
 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
Introduction  ................................ ................................ ................................ ................................ ........................  vi 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  2 
4 Symbols (and abbreviated terms)  ................................ ................................ ................................ ........  4 
5 Classification  ................................ ................................ ................................ ................................ .........  5 
5.1 Grades  ................................ ................................ ................................ ................................ ....................  5 
5.2 Explanation of symbols used  ................................ ................................ ................................ ...............  5 
5.3 Detailed classification  ................................ ................................ ................................ ...........................  5 
6 Requirements  ................................ ................................ ................................ ................................ .........  7 
6.1 Description  ................................ ................................ ................................ ................................ .............  7 
6.2 Homogeneit y ................................ ................................ ................................ ................................ ..........  8 
6.3 Compatibility  ................................ ................................ ................................ ................................ ..........  8 
6.4 Specific requirements  ................................ ................................ ................................ ...........................  9 
7 Packaging and labelling ................................ ................................ ................................ ......................  20 
7.1 Packaging  ................................ ................................ ................................ ................................ .............  20 
7.2 Labelling (see if any ref std)  ................................ ................................ ................................ ...............  20 
8 Sampling  ................................ ................................ ................................ ................................ ..............  20 
9 Test methods  ................................ ................................ ................................ ................................ ....... 20 
  DRS 351: 2017  
©RSB 2017  All rights reserved                  iv 
 
 Foreword  
Rwanda Standard s are prepared  by Technical Committees and approved by R wanda Standards Board (RSB) 
Board  of Directors in  accordance with the procedures of RSB, in compliance with Annex 3 of the WTO/TBT 
agreement on the preparation, adoption and application of standards.  
The main task of technical committees is to prepare national standards.  Final Draft Rwanda S tandards 
adopted by Technical committ ees are ratifie d by me mbers of RSB Board of Director s for publication and 
gazettment as Rwanda Standards.  
DRS 351 was prepared by Technical Committee RSB/TC 024, Chemicals and Consumer Products.  
In the preparation of this standard, reference was made to the following sta ndard:  
IS 1012:2002 , Turbine Lubricating Oils — Specification (Third Revision)  
 
The assistance de rived from the above source is hereby acknowledged with thanks.  
Committee membership  
The following organizations were represented on the Technical Committee on Chemicals and Consumer 
Products  (RSB/TC 024) in the preparation of this standard.  
ALYVO Rwanda Ltd  
AMACO Paints Ltd  
Ameki Color Ltd  
Better home Ltd  
Crown Paints Rwanda Ltd  
IKIREZI N atural Products  
Integrated Polytechnic Regional Centre -Kigali (IPRC -Kigali)  
Inyange Industries Ltd  
National Industrial Research and Development Agency (NIRDA)  
Rwanda Environment Management Authority (REMA)  
Rwanda Plastic Industry Ltd  
Sigma Paints  
SOPYRWA  
SRB Investments (R) Ltd  
Star Construction and Consultancy Ltd  
The Ihangane Project (TIP)  DRS 351: 2017  
v                 ©RSB 2017  All rights reserved  
 
 University of Kibungo (UNIK)  
University of Rwanda -College of Science and Technology (UR -CST)  
Water and Sanitation Corporation Ltd (WASAC Ltd)  
Zirumuze Cooperative  
Rwan da Standards Board  (RSB) – Secretariat  DRS 351: 2017  
©RSB 2017  All rights reserved                  vi 
 
 Introduction  
New turbine technologies have emerged in recent years. This leads to changes in lubricant requirements. For 
example, the development of single shaft combined cycle turbines has resulted in the use of a common 
lubrication system for both the gas and steam turbines. The lubricant has therefore to meet the requirements 
for the lubrication of both.  
The growing concern regarding the environmental behavior of lubricants is also leading to the use of 
biodegrada ble products when there are risks of leakage into soil or surface water. This is particularly the case 
with hydraulic power plants and lubricants, in this application which should demonstrate a low ecotoxicity . 
The following lubricants are considered in th is Rwanda Standard:  
a) mineral oils;  
b) synthetic lubricants, ester and polyalphaolefin types intended for high -temperature gas turbines;  
c) synthetic lubricants, ester and polyalphaolefin types, environmentally acceptable for use in hydraulic  
turbines;  and 
d) fire-resistant phosphate -ester type lubricants.  
 DRS 351: 2017  
1                 ©RSB 2017  All rights reserved  
 
 Lubricating oils for turbines  — Specification  
1 Scope  
This Draft Rwanda Standard specifies the minimum requirements for turbine lubricating  oils (mineral oils  and 
synthetic lubricants) . It specifies the requirements for a wide variety of turbines for power generation, including 
steam turb ines, gas turbines, combined -cycle turbines with a common lubrication system and hydraulic (water 
driven) turbines.  
This document does not specify the requirements for wind turbines.  
This document  is applicable to drive rotating equipment, such as pumps and compressors . 
It is also applicable to lubrication for complex auxiliary systems including hydraulic systems, gear boxes and 
couplings . 
2 Normative references  
The following referenced documents are indispensable for the application of this document. For d ated 
references, only the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendments) applies.  
ISO 8068  Lubricants, industrial oils and related products (class L) — Family T (Turbines) — Specifica tion for 
lubricating oils for turbines  
ISO 6743 -5 Lubricants, industrial oils and related products (class L) — Classification — Part 5: Family T 
(Turbines)  
RS ISO 8681, Petroleum products and lubricants - Method of classification - Definition of classes  
ISO 6072:2011  Rubber — Compatibility between hydraulic fluids and standard elastomeric materials  
ISO 6072  Rubber - Compatibility between hydraulic  fluids and standard elastomeric materials  
ISO 3448  Industrial liquid lubricants — ISO Viscosity Classificatio n 
ISO 3170, Petroleum liquids. Manual sampling  
RS ISO 2049  Petroleum products — Determination of colour  
RS ISO 3104  Petroleum products -- Transparent and opaque liquids -- Determination of kinematic viscosity 
and calculation of dynamic viscosity  
ISO 2909  Petroleum products -- Calculation of viscosity index from kinematic viscosity  
RS ISO 3016  Petroleum products -- Determination of pour point  
RS ISO 12185  Crude petroleum and petroleum products -- Determination of  
density -- Oscillating U -tube method  
RS ISO 3675  Crude petroleum and liquid petroleum products -- Laboratory  
determination of density -- Hydrometer method   
©RSB 2017  All rights reserved                  2 
 
 ISO 2592  Determination of flash and fire points -- Cleveland open cup method  
RS ISO 2719  Determination of flash point  
ISO 6618  Petroleum products and lubricants -- Determination of acid or base number -- Colour -indicator 
titration method  
RS ISO 6619  Petroleum products and lubricants -- Neutralization  
number -- Potentiometric titration method  
RS ISO 7537 Petroleum products -- Determination of acid number -- Semi -micro colour -indicator titration 
method  
RS ISO 6296  Petroleum products -- Determination of water -- Potentiometric Karl Fischer titration method  
RS ISO 6 247 Petroleum products -- Determination of foaming characteristics of lubricating oils  
ISO 9120  Petroleum and related products -- Determination of air - 
release properties of steam turbine and other oils  
RS ISO 2160  Petroleum products -- Corrosiveness to co pper -- Copper strip test  
ISO 7120 Petroleum products and lubricants -- Petroleum oils and other fluids -- Determination of rust -
preventing characteristics in the presence of water  
RS ISO 6614  Petroleum products -- Determination of water separability of pe troleum oils and synthetic fluids  
ISO 4263 -1 Petroleum and related products -- Determination of the ageing behaviour of inhibited oils and 
fluids -- TOST test -- Part 1: Procedure for mineral oils  
ASTM D2272 - 14a Standard Test Method for Oxidation Stabili ty of Steam Turbine Oils by Rotating Pressure 
Vessel  
ISO 7624 Petroleum products and lubricants -- Inhibited mineral turbine oils -- Determination of oxidation 
stability  
RS ISO 13357 -1 Petroleum products -- Determination of the filterability of  
lubricating oils -- Part 1: Procedure for oils in the presence of water  
ISO 1335 -2 Petroleum products -- Determination of the filterability of lubricating oils -- Part 2: Procedure for 
dry oils  
ASTM D4636 -14 Standard Test Method for Corrosiveness and Oxidation Stability of Hydraulic Oils, Aircraft 
Turbine Engine Lubricants, and Other Highly Refined Oils  
ASTM D4304 -13 Standard Specification for Mineral and Synthetic Lubricating Oil Used in Steam o r Gas 
Turbines  
3 Terms and definitions  
3.1 
turbine  
turbomachine with at least one moving part called a rotor assembly, which is a shaft or drum with blades 
attached. Moving fluid acts on the blades so that they move and impart rotational energy to the rotor text of 
the definition  DRS 351: 2017  
3                 ©RSB 2017  All rights reserved  
 
 3.2 
turbomachine  
machine in which a transfer of energy takes place between a rotating solid part (a rotor) and a fluid. The 
turbomachines are generally distinguished according to whether the energy is transferred from the fluid to th e 
rotor or from the rotor to the fluid. In the first case, they are receiving machines such as gas turbines, hydraulic 
turbines, wind turbines, etc. Whereas in the second case, they are generating machines among which are 
found pumps, compressors, and vent ilators  
3.3  
lubricant  
substance introduced to reduce friction  between surfaces in mutual contact, which ultimately reduces the heat 
generated when the surfaces move. It may also have the  function of transmitting forces, transporting foreign 
particles, or heating or cooling the surfaces. Lubricant is a substance used for lubricating an engine or 
component, such as oil or grease  
3.4 
lubricating oil  
oily substance that is used to cover or treat machin ery so as to lessen  friction . Today, lubricating  oil, or lube 
oil, is the most commonly used lubricant because of its wide range of possible applications. The two basic 
categories of lube oil are mineral  and synthetic . Synthetic oils are manufactured polyalphaolefins, which are 
hydrocarbon -based polyglycols or ester oils  
3.5 
turbine lubricating oil  
any oil used to lubricate the bearings and auxiliary machinery in steam and hydraulic turbine s, in turbopumps, 
and in air, gas, and refrigeration turbocompressors. Turbine  lubricating oils are also used as lubricants and 
working fluids in various types of cl osed -cycle industrial machinery  
3.5 
mineral oils  
oils refined from naturally oc curring petroleum, or crude oil  
3.6 
synthetic lubricant  
originating from the chemical synthesis of relatively pure organic compounds from one or more of a wide 
variety of raw  materials  
3.7 
elastomer  
macromolecular material which returns rapidly to approximately it s initial dimensions and shape after 
substantial deformation by a weak stress and release of the stress  
3.8 
elastomer compatibility index  (ECI)  
simple one -line designation incorporating the details of the changes in volume, hardness, tensile strength and 
elongation at break which standard test specimens of a test elastomer undergo when immersed in a particular 
fluid under specified test conditions   
©RSB 2017  All rights reserved                  4 
 
 NOTE  An elastomer compatibility index can be established for each combination of fluid and test elastomer spec ified 
in Table 2.  
4 Symbols (and abbreviated terms ) 
EPDM 1 : ethylene propylene diene rubber  
FKM 2 : fluorocarbon rubber  
HNBR 1 : hydrogenated acrylonitrile -butadiene rubber  
NBR 1 : acrylonitrile -butadiene rubbers  
NBR 2 : acrylonitrile -butadiene rubbers  
T: Turbin e 
TGA: Mineral oils, Gas turbine, direct coupled or geared to the load for normal services  
TGB: Mineral oils, Gas turbine, direct coupled or geared to the load for Normal service  
TGCE: Synthetic esters, Gas turbine, direct coupled or geared to the load for  normal services  
TGCH: Synthetic hydrocarbons, Gas turbine, direct coupled or geared to the load for normal services  
TGD: Aryl phosphate ester, turbine Gas, direct coupled or geared to the load for normal services  
TGE: Mineral oils, Gas turbine, direct coupled or geared to the load for fire resistance,  
TGF: Mineral oils, Gas turbine, direct coupled or geared to the load for High temperature service and high 
load carrying ability  
TGSB: Mineral oils, Single shaft combined cycle turbines, wi th common lubrication system for High 
temperature service  
TGSE: Mineral oils, Single shaft combined cycle turbines, with common lubrication system for High 
temperature service and high load carrying ability  
THA: Mineral oils, Hydraulic turbine for normal s ervice  
THCE: Synthetic esters, hydraulic turbine  for high load carrying ability  
THCH: Synthetic hydrocarbons, hydraulic turbine for special properties  
THE: Mineral oils, Hydraulic turbine for high load carrying ability  
TSA: Mineral oils, Steam  turbine for normal services  
TSD: Aryl phosphate ester, turbine steam for fire resistance  
TSE: Mineral oils, Steam turbine geared to the load  
VG: Viscosity Grade  DRS 351: 2017  
5                 ©RSB 2017  All rights reserved  
 
 5 Classification  
5.1 Grades  
5.1.1  The lubricating oil shall fall in one of the following f ive grades as defined in IS 9466:  
a) VG32;  
b) VG46;  
c) VG68; 
d) VG100 ; and 
e) VG150.  
5.1.2  Lubricating oils of other intermediate viscosities  may also be blended as agreed to between the  
purchaser and the supplier.  
5.2 Explanation of symbols used  
4.2.1 The detailed classification of family T has been established by defining the categories of products 
required for the various applications of this family.  
 
4.2.2 Each category is designated by a symbol consisting of a group of letters, which together constitute a 
code.  
 
The first letter of the code (T) identifies the family of the product considered, but any following letters taken 
separately have no significance of their own.  
 
The designation of each category can be supplemented by a number denoting the viscosity grade  (VG)  of the 
lubricant in accordance with ISO 3448.  
 
4.2.3 In the present classification system, products are designated in a uniform manner. For example, a 
particular product may be designated in complete form, i.e. ISO -L-TSA 46, or in an abbreviated form,  i.e. 
LTSA 46.  
 
4.2.4 In this classification system, turbine lubricants are classified separately. It is common that some 
turbine lubricants may be used in different turbine types. Some examples are given hereafter – the examples 
below are  not restrictive:  
a) the same lubricant may cover L -TSA, L -TGA and L -THA categories;  
b) the same lubricant may c over L -TSE and L -THE categories;  
c) the same lubricant may cover  L-TGB and L -TGSB categories;  
d) the same lubricant may co ver L -TGF and L -TGSE categories;   
e) the same lubricant may cover L -TSD, L -TGD and L -TCD categories.  
5.3 Detailed classification  
The detailed classification is shown in Table 1.   
©RSB 2017  All rights reserved                  6 
 
 Table 1 classification of lubricating oils for turbines  
 
Code  
letter  General  
application  Particular  
application  More specific  
application  Product type and/or  
performance  
requirements  Symbol  
ISO - L Typical applications  Remarks  
T Turbines  Steam  Normal 
service  Highly refined petroleum -
base stocks  rust- and 
oxidation inhibited  TSA Power generation and 
industrial drives and  their 
associated control 
mechanisms, when fire 
resistance is not needed or 
mandatory. Marine drives 
where improved load -
carrying properties are not 
specified for the gearing   
Geared to the  
load Highly refined  petroleum -
base stocks  rust- and 
oxidation inhibited, with 
enhanced  load carrying 
ability  TSE Power generation and 
industrial drives, marine 
geared drives and their 
associated control systems, 
when the gearing  requires 
improved load carrying 
ability   
Fire 
resistance  Phosphate -ester -based  
lubricant  TSD Power generation and 
industrial drives and their 
associated control 
mechanisms, when fire  
resistance is required   
Gas, direct  
coupled or  
geared to  
the load  Normal 
service  Highly refined  petroleum -
base stocks  rust- and 
oxidation inhibited  TGA Power generation and 
industrial drives and their 
associated control 
mechanisms, when fire 
resistance is not needed or 
mandatory. Marine drives 
where improved load -
carrying properties are not 
needed for the gearing   
High 
temperature 
service  Highly r efined  petroleum -
base stocks  rust- and 
oxidation inhibited  TGB Power generation and 
industrial  drives and their 
associated  control systems 
where high  temperature 
resistance is  required   
Special  
properties  Synthetic fluids,  
polyalphaolefins and  
related hydrocarbons  TGCH  Power generation and 
industrial drives and their 
associated control systems 
where special properties of 
the fluid are of interest for 
the application (enhanced 
oxidation stability, low -
temperature properties, …)   
Special  
properties  Synthetic fluid,  synthetic -
ester type  TGCE  Power generation and 
industrial drives and their 
associated control systems 
where special properties of 
the fluid are of interest for 
the application (enhanced 
oxidation stability, low -
temperature properties, …)  These fluids  
may also  
exhibit some  
environment  
acceptability  
character  
Fire 
resistance  Phosphate -ester -based  
lubricant  TGD  Power generation and 
industrial drives and their 
associated control 
mechanisms, when fire 
resistance is required   DRS 351: 2017  
7                 ©RSB 2017  All rights reserved  
 
 High load 
carrying  ability  Highly refined  petroleum -
base stocks  rust- and 
oxidation inhibited,  with 
enhanced  load carrying 
ability  TGE Power generation and 
industrial  drives, marine 
geared drives  and their 
associated control  systems, 
when the gearing  requires 
improv ed load carrying  
ability   
High 
temperature  
service and  
high load  
carrying ability  Highly refined  petroleum -
base stocks  rust- and 
oxidation inhibited, with 
enhanced  load carrying 
ability  TGF Power generation and 
industrial drives and their 
associated co ntrol systems 
where high temperature 
resistance and load carrying 
properties are required   
Single shaft  
combined  
Cycle 
turbines,  
with 
common  
lubrication  
system  High 
temperature  
service  Highly refined  petroleum 
base stocks  or synthetic 
base stock,  rust and 
oxidation  inhibited  TGSB  Power generation and the  
control systems, where fire  
resistance is not needed   
High 
temperature  
service and  
high load 
carrying  ability  Highly refined  petroleum -
base stocks  or synthetic -
base stock,  rust- and 
oxidation inhibited, with 
enhanced  load-carrying 
ability  TGSE  Power generation and the  
control systems, where fire  
resistance is not needed 
and where the gears require  
improved load -carrying 
ability.   
Control  
systems  Fire resistant  Phosphate -ester control  
fluid TCD Steam, gas, hydraulic 
turbine control mechanisms 
where fluid supply is 
separate from the  turbine 
lubricant and fire  resistance 
is needed   
Hydraulic  Normal 
service  Highly refined  petroleum -
base stocks  rust- and 
oxidation inhibited.  THA Hydro -turbines  with 
hydrostatic  system   
Special  
properties  Synthetic fluids,  
polyalphaolefins and  
related hydrocarbons  THCH  Hydro -turbines, when low 
water  toxicity and 
environment  
protection properties are 
needed   
Special  
properties  Synthetic fluid,  synthetic -
ester type  THCE  Hydro -turbines, when low 
water  toxicity and 
environment  protection 
properties are needed   
High load 
carrying  ability  Highly refined  petroleum -
base stocks  rust- and 
oxidation inhibited,  with 
friction  and/or load -
carrying  additi ves THE Hydro -turbines without  
hydrostatic systems   
6 Requirements  
6.1 Description  
5.1.1  The oil shall be blended from suitably refined turbine quality base stocks and additives such as rust 
and oxidation inhibitors and se lected additives as required to control  wear, foam,  demulsibility, etc ; to meet the 
requirements of this standard. The use of viscosity improvers is not permitted.  
5.1.2 The finished oil  shall be  clear  and free from  water, suspended matter, dirt, sediment and other 
extraneous impurities.   
©RSB 2017  All rights reserved                  8 
 
 6.2 Homogeneity  
The additives used shall be wholly soluble in the oil and shall be uniformly distributed throughout at all 
temperatures above the specified pour point up to 120  0C. When cooled to 6 0C below its pour point for 4 h, 
the oil shall regain homogene ity and shall show no evidence of separation or stratification when brought to the 
ambient temperature in an undisturbed condition.  
6.3 Compatibility  
6.3.1  Oils shall be considered to be compatible, if a mixture of equal volumes of unused oils complies fully 
with the requirements of this standard.  
6.3.2  The elastomer compatibility index shall be determined according to ISO 6072 under the conditions 
listed in  Table 2, according to  the product category. Table 4 gives guidelines on acceptable changes of 
properties.  
6.3.3  Other elastomers and other limits may be used or specified by the end user depending on the 
purpose and  conditions of actual use. In addition, the turbine oil shall be compatible with all material 
constituents of the  lubricating system.  
Table 2 — Test conditions according to ISO 6072 for the determination of the elastomer compatibility 
index  
Fluid  Symbol  (ISO 6743 -5[2])  Suitable  elastomer  Test temperature  1 
°C Examples of test  
duration a 2 h 
Mineral oils  TSA, TGA, TSE, TGE, 
TGB, TGSB, TGF, 
TGSE, THA, THE  NBR 1,2  100 168 1000  
HNBR 1  130 
FKM 2  150 
Synthetic esters  TGCE,  
THCE  NBR 1,2  60 168 1000  
HNBR 1  100 
FKM 2  100 
Synthetic hydrocarbons  TGCH,  
THCH  NBR 1,2  100 168 1000  
HNBR 1  130 
FKM 2  150 
Aryl phosphate ester  TSD 
TGD  FKM 2  150 168 1000  
EPDM 1  130 
a  The test duration of 1 000 h is recommended (but a shorter test duration can provide additional compatibility information) for evaluation 
of elastomer compatibility with fluids which cause longer term changes  to the elastomer . 
 
Table 3 — Guidelines on acceptable changes of properties, according to ISO 6072  
 
Immersion time  
h Maximum  
volume swell  
% Maximum volume  
shrinkage  
% Hardness  
change  
IRHD  Maximum tensile  
stress change  
% Maximum  
elongation change  
% 
168 15 4 8 20 20 
1 000  20 5 10 50 50 
 DRS 351: 2017  
9                 ©RSB 2017  All rights reserved  
 
 6.4 Specific r equirements  
6.4.1  Fluids, when tested under the prescribed methods, shall be in accordance with the limits set out in 
Tables 4 to 12, depending on the type.  
6.4.2  The appearance of the delivered oils shall be clear and bright and free of any visible particulate 
matter, under visible light at ambient temperature.  
6.4.3  These oils shall not contain any viscosity -index improver.  
6.4.4  Most of the test methods specified in the tables contains  a precision statement. In cases of dispute, 
the procedure described in ISO 4259 shall apply. Water content is specified using ISO 760, ISO 6296, ISO 
12937or ISO 20764. In case of dispute, ISO 20764 shall be used.  
5.4.1 Specification for TSA and TGA turbine oils  
These lubricants are mineral oils with suitable antioxidants and corrosion inhibitors, for the lubrication of steam  
turbines and gas turbines (normal service). Specifications are given in Table 4. 
5.4.2 Specification for TSE and TGE turbine oils  
These lubricants are TSA and TGA types turbine oils, with additional extreme -pressure performance to  
lubricate gear systems. S pecifications are given in Table 5. 
5.4.3 Specification for TGB and TGSB turbine oils  
These lubricants are mineral oils or synthetic -base stocks with suitable antioxidants and corrosion inhibitors.  
These oils shall withstand higher temperatures and exhibit  higher thermal stability than TSA and TGA oil 
types. The TGSB type shall fulfill the requirements of both TSA and TGB oils. Specifications are given in 
Table 6. 
5.4.4 Specification for TGF and TGSE turbine oils  
These lubricants are mineral oils or synthetic -base stocks with suitable antioxidants, corrosion inhibitors and  
additional extreme -pressure additives to impart the required load carrying performance. These oils shall  
withstand higher temperatures and exhibit higher thermal stability than TSE and TGE oil types. The TGSE  
type shall fulfill the requirements of both TGF and TSE oils. Specifications are given in Table 7. 
5.4.5 Specification for TGCH turbine oils  
This type of oil is formulated from synthetic -base oil, polyalphaolefin type, with suit able antioxidants and  
corrosion inhibitors. It is intended for high -temperature service, with a better oxidation and thermal stability 
than TGB type oils, and therefore a longer service life. Specifications are given in Table 8. 
5.4.6 Specification for TGC E turbine oils  
This type of oil is formulated from a synthetic ester base with suitable antioxidants and corrosion inhibitors. It  
is intended for high -temperature service in aero -derivative turbines. These oils should be in accordance with  
the MIL-PRF-7808L grade  or the specifications of MIL -PRF-23699 STD  or MIL -PRF-23699 HTS  or with  the 
manufacturer’s specification.  
5.4.7 Specification for THA and THE turbine oils  
These lubricants are mineral oils with suitable antioxidants, corrosion inhibitor s (THA) and additional extreme 
pressure additives (THE), when the bearings (normal and thrust) operate in boundary/mixed -lubrication 
regime at start -up of the turbine. THA and THE products are very close to CKB and CKC categories, 
respectively, as defined in ISO 6743 -6 and specified in ISO 12925 -1. Specifications are given in Table 9. 
5.4.8 Specification for THCH turbine oils   
©RSB 2017  All rights reserved                  10 
 
 This type of oil is formulated from polyalphaolefins and related hydrocarbons, with suitable additives with the  
exception of viscosity index improvers. This type of oil is essentially “environmentally acceptable”, i.e.  
biodegradable and with low water toxicity, and close to the product type HEPR defined in ISO 6743 -4 and 
specified in ISO 15380 [5]. Specifications are given in Tab le 10. 
5.4.9 Specification for THCE turbine oils  
This type of oil is formulated from synthetic esters, with suitable additives with the exception of viscosity index  
improvers. This type of oil is essentially “environmentally acceptable”, i.e.  biodegradable and with low water  
toxicity, and close to the product type HEES defined in ISO 6743 -4 and specified in ISO 15380.  Specifications 
are given in Table 11. 
5.4.10 Specification for TSD and TGD turbine oils  
This type of oil is formulated from phosphate esters with suitable additives. It is intended for applications  
requiring fire resistance. Specifications are given in Table 12. 
  DRS 351: 2017  
11                 ©RSB 2017  All rights reserved  
 
 Table 4 — Specification for turbine oils L -TSA and L -TGA  
 
Property  Unit Viscosity class  Test method  
32 46 68 
Viscosity class   32 46 68 ISO 3448  
Color  rating  report  ISO 2049  
Appearance  rating  clear and bright  Visual  
Kinematic viscosity at 40 °C  
— minimum  
— maximum   
mm2/s  
28.8 
35.2  
41.4 
50.6   
61.2 
74.8  
ISO 3104  
Viscosity index (minimum)   90 90 90 ISO 2909  
Pour point (maximum) a  0C -6 -6 -6 ISO 3016  
Density at 15 °C  kg/m3 report  ISO 12185 or  
ISO 3675  
Flash point (minimum)  
— open cup  
— closed cup   
0C  
186 
170  
186 
170  
186 
170  
ISO 2592  
ISO 2719  
Total acid number (maximum) b  mg KOH/g  0.2 0.2 0.2 ISO 6618 or 
ISO 6619 or  
ISO 7537  
Water content (maximum)  % (m/m) 0,02 0,02 0,02 ISO 6296 or  
ISO 12937  
Foaming (tendency/stability) (maximum) c  
— sequence 1 °C at 24 °C  
— sequence 2 °C at 93 °C  
— sequence 3 °C at 24 °C after 93 °C   
ml/ml  
ml/ml  
ml/ml   
450/0  
50/0 
450/0   
450/0  
50/0 
450/0   
450/0  
50/0 
450/0   
ISO 6247  
Air release time at 50 °C (maximum)  min 5 5 6 ISO 9120  
Copper corrosion (3 h at 100 °C) (maximum)  rating  1 1 1 ISO 2160  
Corrosion -preventive properties (24 h)  rating  pass  ISO 7120 (B)  
Demulsibility d (maximum time to reach 3 ml 
emulsion at 54 °C)   
min  
30  
30  
30  
ISO 6614  
Oxidation stability (rotating pressure vessel) 
(minimum) e   
min  
report  ASTM D 
2272 -02 
Oxidation stability (“TOST”) f  
— total acid number at 1000 h (maximum)  
— time for total acid number 2 mgKOH/g (min)  
— sludge after 1000 h (maximum)   
mg KOH/g  
h 
mg  
0,3 
3 500  
200  
0,3 
3 000  
200  
0,3 
2 500  
200  
ISO 4263 -1 
Oxidation stability f  
— total oxygen -containing products,TOP (max)  
— sludge (maximum)   
% (m/m) 
% (m/m)  
0,40 
0,25  
0,50 
0,30  
0,50 
0,30  
ISO 7624  
Filterability (dry) (minimum)  % 85 85 85 ISO 13357 -2 
Filterability (wet)  % pass  ISO 13357 -1 
Cleanliness at the delivery stage g (maximum)  rating  — / 17 / 14  ISO 4406  
a  Lower values may be negotiated between the end user and the supplier.  
B  In case of dispute, ISO 6618 applies.  
c  The stability of the foam is recorded at 300 s for the first and third sequences, and at 60 s for the second sequence.  
D  Applies only to TSA. Lower limits for emulsion volume or time may be specified.  
e  This value is useful for the follow -up in service. Should not normally be below 250 min.  
f  Either of the two methods.  
G  ISO 11500[8], using an automatic particle counter calibrated according to ISO 11171[9], is the preferred test method for 
counting a nd sizing particles.  
 
   
©RSB 2017  All rights reserved                  12 
 
 Table 5 — Specification for turbine oils L -TSE and L -TGE 
 
Property  Unit Viscosity class  Test method  
32 46 68 
Viscosity class   32 46 68 ISO 3448  
Color  rating  report  ISO 2049  
Appearance  rating  clear and bright  Visual  
Kinematic viscosity at 40 °C  
— minimum  
— maximum   
mm2/s  
28.8 
35.2  
41.4 
50.6  
61.2 
74.8  
ISO 3104  
Viscosity index (minimum)   90 90 90 ISO 2909  
Pour point (maximum) a  0C -6 -6 -6 ISO 3016  
Density at 15 °C  kg/m3 report  ISO 12185 or  
ISO 3675  
Flash point (minimum)  
— open cup  
— closed cup   
0C  
186 
170  
186 
170  
186 
170  
ISO 2592  
ISO 2719  
Total acid number (maximum) b  mg KOH/g  0.2 0.2 0.2 ISO 6618 or  
ISO 6619 or  
ISO 7537  
Water content (maximum)  % (m/m) 0,02 0,02 0,02 ISO 6296 or  
ISO 12937  
Foaming (tendency/stability) (maximum) c  
— sequence 1 °C at 24 °C  
— sequence 2 °C at 93 °C  
— sequence 3 °C at 24 °C after 93 °C   
ml/ml  
ml/ml  
ml/ml   
450/0  
50/0 
450/0   
450/0  
50/0 
450/0   
450/0  
50/0 
450/0   
ISO 6247  
Air release time at 50 °C (maximum)  min 5 5 6 ISO 9120  
Copper corrosion (3 h at 100 °C) (maximum)  rating  1 1 1 ISO 2160  
Corrosion -preventive properties (24 h)  rating  pass  ISO 7120 (B)  
Demulsibility d (maximum time to reach 3 ml 
emulsion at 54 °C)   
min  
30  
30  
30  
ISO 6614  
Oxidation stability (rotating pressure vessel) 
(minimum) e   
min  
report  ASTM D 
2272 -02 
Oxidation stability (“TOST”) f  
— total acid number at 1000 h (maximum)  
— time for total acid number 2 mgKOH/g (min)  
— sludge after 1000 h (maximum)   
mg KOH/g  
h 
mg  
0,3 
3 500  
200  
0,3 
3 000  
200  
0,3 
2 500  
200  
ISO 4263 -1 
Filterability (dry) (minimum)  % 85 85 85 ISO 13357 -2 
Filterability (wet)  % pass  ISO 13357 -1 
Load -carrying capacity – FZG test (A/8,3/90)  
Failure -load stage (minimum) f   
rating   
8  
9  
10  
ISO 14635 -1 
Cleanliness at the delivery stage g (maximum)  rating  — / 17 / 14  ISO 4406  
a  Lower values may be negotiated between the end user and the supplier.  
b  In case of dispute, ISO 6618 applies.  
c  The stability of the foam is recorded at 300 s for the first and third sequences, and at 60 s for the second sequence.  
d  Applies only to TSA. Lower limits for emulsion volume or time may be specified.  
e  This value is useful for the follow -up in service. Should not normally be below 250 min.  
f  Either of the two methods.  
g  ISO 11500[8 ], using an automatic particle counter calibrated according to ISO 11171[9], is the preferred test method for 
counting and  sizing particles.  
 
  DRS 351: 2017  
13                 ©RSB 2017  All rights reserved  
 
 Table 6 — Specification for turbine oils L -TGB and L -TGSB  
 
Property  Unit Viscosity class  Test method  
32 46 68 
Viscosity class   32 46 68 ISO 3448  
Color  rating  report  ISO 2049  
Appearance  rating  clear and bright  Visual  
Kinematic viscosity at 40 °C  
— minimum  
— maximum   
mm2/s  
28.8 
35.2  
41.4 
50.6   
61.2 
74.8  
ISO 3104  
Viscosity index (minimum)   90 90 90 ISO 2909  
Pour point (maximum) a  0C -6 -6 -6 ISO 3016  
Density at 15 °C  kg/m3 report  ISO 12185 or  
ISO 3675  
Flash point (minimum)  
— open cup  
— closed cup   
0C  
200 
190  
200 
190  
200 
190  
ISO 2592  
ISO 2719  
Total acid number (maximum) b  mg KOH/g  0.2 0.2 0.2 ISO 6618 or  
ISO 6619 or  
ISO 7537  
Water content (maximum)  % (m/m) 0,02 0,02 0,02 ISO 6296 or  
ISO 12937  
Foaming (tendency/stability) (maximum) c  
— sequence 1 °C at 24 °C  
— sequence 2 °C at 93 °C  
— sequence 3 °C at 24 °C after 93 °C   
ml/ml  
ml/ml  
ml/ml   
450/0  
50/0 
450/0   
450/0  
50/0 
450/0   
450/0  
50/0 
450/0   
ISO 6247  
Air release time at 50 °C (maximum)  min 5 5 6 ISO 9120  
Copper corrosion (3 h at 100 °C) (maximum)  rating  1 1 1 ISO 2160  
Corrosion -preventive properties (24 h)  rating  pass  ISO 7120 (B)  
Demulsibility d (maximum time to reach 3 ml 
emulsion at 54 °C)   
min  
30  
30  
30  
ISO 6614  
Oxidation stability (rotating pressure vessel) 
(minimum)  min 750 750 750 ASTM D2272 -02 
Oxidation stability (rotating pressure vessel) 
(minimum) e   
% 85 85 85 ASTM D  2272 -02 
Oxidation stability at high temperature (72 h at 
175 °C)  
— viscosity change (maximum)  
— acid number change (maximum)  
— metal specimen mass change  
— steel  
— aluminium  
— cadmium  
— copper  
— magnesium   
 
% 
mg KOH/g  
mg/cm2  
 
report  
report  
 
 0,250  
 0,250  
 0,250  
 0,250  
 0,250   
 
report  
report  
 
0,250  
0,250  
0,250  
0,250  
0,250   
 
report  
report  
 
0,250  
0,250  
0,250  
0,250  
0,250   
 
 
 
ASTM D 4636  
according to  
“alternative  
procedure 2”  
Oxidation stability (“TOST”)  
— time for total acid number 2 mgKOH/g (min)   
h  
3 500   
3 000   
2 500   
ISO 4263 -1 
Filterability (dry) (minimum)  % 85 85 85 ISO 13357 -2 
Filterability (wet)  % pass  ISO 13357 -1 
Cleanliness at the delivery stage f (maximum)  rating  — / 17 / 14  ISO 4406  
a  Lower values may be negotiated between the end user and the supplier.  
b  In case of dispute, ISO 6618 applies.  
c  The stability of the foam is recorded at 300 s for the first and third sequences, and at 60 s for the second sequence.  
d  Applies to TGSB only .  
e  Nitrogen blown  RPVOT is performed by treatment of 300 ml of oil at 121 °C, by bubbling clean and dry nitrogen for 48 h at 
the rate  
of 3 l/h. The result is expressed as the percent of life versus the sample without treatment.  
f  ISO 11500[8], using an automatic particle  counter calibrated according to ISO 11171[9], is the preferred test method for 
counting and  sizing particles.  
   
©RSB 2017  All rights reserved                  14 
 
 Table 7 — Specification for turbine oils L -TGF and L -TGSE  
Property  Unit Viscosity class  Test method  
32 46 68 
Viscosity class   32 46 68 ISO 3448  
Color  rating  report  ISO 2049  
Appearance  rating  clear and bright  Visual  
Kinematic viscosity at 40 °C  
— minimum  
— maximum   
mm2/s  
28.8 
35.2  
41.4 
50.6   
61.2 
74.8  
ISO 3104  
Viscosity index (minimum)   90 90 90 ISO 2909  
Pour point (maximum) a  0C -6 -6 -6 ISO 3016  
Density at 15 °C  kg/m3 report  ISO 12185 or  
ISO 3675  
Flash point (minimum)  
— open cup  
— closed cup   
0C  
200 
190  
200 
190  
200 
190  
ISO 2592  
ISO 2719  
Total acid number (maximum) b  mg KOH/g  0.2 0.2 0.2 ISO 6618 or  
ISO 6619 or  
ISO 7537  
Water content (maximum)  % (m/m) 0,02 0,02 0,02 ISO 6296 or  
ISO 12937  
Foaming (tendency/stability) (maximum) c  
— sequence 1 °C at 24 °C  
— sequence 2 °C at 93 °C  
— sequence 3 °C at 24 °C after 93 °C   
ml/ml  
ml/ml  
ml/ml   
50/0 
50/0 
50/0  
50/0 
50/0 
50/0  
50/0 
50/0 
50/0  
ISO 6247  
Air release time at 50 °C (maximum)  min 5 5 6 ISO 9120  
Copper corrosion (3 h at 100 °C) (maximum)  rating  1 1 1 ISO 2160  
Corrosion -preventive properties (24 h)  rating  pass  ISO 7120 (B)  
Demulsibility d (maximum time to reach 3 ml 
emulsion at 54 °C)   
min  
30  
30  
30  
ISO 6614  
Oxidation stability (rotating pressure vessel) 
(minimum)  min 750 750 750 ASTM D2272 -02 
Oxidation stability (rotating pressure vessel) 
(minimum) e   
% 85 85 85 ASTM D 2272 -02 
Oxidation stability at high temperature (72 h at 
175 °C)  
— viscosity change (maximum)  
— acid number change (maximum)  
— metal specimen mass change  
— steel  
— aluminium  
— cadmium  
— copper  
— magnesium   
 
% 
mg KOH/g  
mg/cm2  
 
report  
report  
 
0,250  
0,250  
0,250  
0,250  
0,250   
 
report  
report  
 
0,250  
0,250  
0,250  
0,250  
0,250   
 
report  
report  
 
0,250  
0,250  
0,250  
0,250  
0,250   
 
 
 
ASTM D 4636  
according to  
“alternative  
procedure 2”  
Oxidation stability (“TOST”)  
— time for total acid number 2 mgKOH/g (min)   
h  
3 500   
3 000   
2 500  
ISO 4263 -1 
Filterability (dry) (minimum)  % 85 85 85 ISO 13357 -2 
Filterability (wet)  % pass  ISO 13357 -1 
Load -carrying capacity – FZG test (A/8,3/90)  
Failure load stage (minimum) e   
rating   
8  
9  
10  
ISO 14635 -1 
Cleanliness at the delivery stage f (maximum)  rating  — / 17 / 14  ISO 4406  
a  In case of dispute, ISO 6618 applies.  
b The stability of the foam is recorded at 300 s for the first and third sequences, and at 60 s for the second sequence.  
c  Applies to TGSB only.  
d  Nitrogen blown RPVOT is performed by treatment of 300 ml of oil at 121 °C, by bubbling clean and dry nitrogen for 48 h at 
the rate  of 3 l/h. The result is expressed as the percent of life versus the sample without treatment.  
e Higher failure load stages  may be requested by some manufacturers/users.  
f  ISO 11500[8], using an automatic particle counter calibrated according to ISO 11171[9], is the preferr ed test method for 
counting and sizing particles.  
 
 DRS 351: 2017  
15                 ©RSB 2017  All rights reserved  
 
 Table 8 — Specification for turbine oils L -TGCH  
(Synthetic fluids: polyalphaolefins and related hydrocarbons)  
 
Property  Unit Viscosity class  Test method  
32 46 
Viscosity class   32 46 ISO 3448  
Color  rating  report  ISO 2049  
Appearance  rating  clear and bright  Visual  
Kinematic viscosity at 40 °C  
— minimum  
— maximum   
mm2/s  
28.8 
35.2  
41.4 
50.6  
ISO 3104  
Viscosity index   report  ISO 2909  
Pour point (maximum) a  0C -21 -21 ISO 3016  
Density at 15 °C  kg/m3 report  ISO 12185 or  
ISO 3675  
Flash point open cup (minimum)  0C 200 200 ISO 2592  
 
Total acid number (maximum) b   
mg KOH/g   
report a ISO 6618 or  
ISO 6619 or  
ISO 7537  
Water content (maximum)  % (m/m) 0,02 0,02 ISO 6296 or  
ISO 12937  
Foaming (tendency/stability) (maximum) c  
— sequence 1 °C at 24 °C  
— sequence 2 °C at 93 °C  
— sequence 3 °C at 24 °C after 93 °C   
ml/ml  
ml/ml  
ml/ml   
50/0 
50/0 
50/0  
50/0 
50/0 
50/0  
ISO 6247  
Air release time at 50 °C (maximum)  min 5 5 ISO 9120  
Copper corrosion (3 h at 100 °C) (maximum)  rating  1 1 ISO 2160  
Corrosion -preventive properties (24 h)  rating  pass  ISO 7120 (B)  
Demulsibility d (maximum time to reach 3 ml 
emulsion at 54 °C)   
min  
report a  
ISO 6614  
Oxidation stability (rotating pressure vessel) 
(minimum)  min 1000  1000  ASTM D2272 -02 
Oxidation stability (rotating pressure vessel) 
(minimum) e   
% 85 85 ASTM D 2272 -02 
Oxidation stability at high temperature (72 h at 
175 °C)  
— viscosity change (maximum)  
— acid number change (maximum)  
  
 
% 
mg KOH/g  
  
 
-3;  +5  
2  
 
-3;  +5  
2 ASTM D 4636  
according to  
“alternative  
procedure 2”  
Oxidation stability (“TOST”)  
— time for  total acid number 2 mgKOH/g (min)   
h  
4 000   
3 500  
ISO 4263 -1 
Filterability (dry) (minimum)  % 80 80 ISO 13357 -2 
Filterability (wet)  % pass  ISO 13357 -1 
Cleanliness at the delivery stage f (maximum)  rating  — / 17 / 14  ISO 4406  
a  To be negotiated between the end user and the supplier.  
b  In case of dispute, ISO 6618 applies.  
c  Oils with results greater than 1 000 min exhibit poor precision according to ASTM D 2272 -02, Clause 11. It would be 
expected that  
oils of this type exhibit values significan tly higher than 1 000 min and probably greater than 1 500 min.  
d  Nitrogen blown RPVOT is performed by treatment of 300 ml of oil at 121 °C, by bubbling clean and dry nitrogen for 48 h at 
the rate of 3 l/h. The result is expressed as the percent of life ve rsus the sample without treatment.  
e  ISO 11500[8], using an automatic particle counter calibrated according to ISO 11171[9], is the preferred test method for 
counting and sizing particles.  
 
   
©RSB 2017  All rights reserved                  16 
 
 Table 9 — Specification for turbine oils L -THA and L -THE 
 
Property  Unit Viscosity class  Test method  
68 100 150 
Viscosity class   68 100 150 ISO 3448  
Color  rating  report  ISO 2049  
Appearance  rating  clear and bright  Visual  
Kinematic viscosity at 40 °C  
— minimum  
— maximum   
mm2/s  
61.2 
74.8  
90.0 
110.0    
135 
165  
ISO 3104  
Viscosity index (minimum)   90 90 90 ISO 2909  
Pour point (maximum)  0C -12 -12 -9 ISO 3016  
Density at 15 °C  kg/m3 report  ISO 12185 or  
ISO 3675  
Flash point open cup (minimum)  0C 180 200 200 ISO 2592  
 
Total acid number (maximum) a   
mg KOH/g   
report  ISO 6618 or  
ISO 6619 or  
ISO 7537  
Water content (maximum)  % (m/m) 0,02 0,02 0,02 ISO 6296 or  
ISO 12937  
Foaming (tendency/stability) (maximum) c  
— sequence 1 °C at 24 °C  
— sequence 2 °C at 93 °C  
— sequence 3 °C at 24 °C after 93 °C   
ml/ml  
ml/ml  
ml/ml   
100/0 
100/0 
100/0  
100/0  
100/0  
100/0   
100/0  
100/0  
100/0   
ISO 6247  
Air release time at 50 °C (maximum)  
Air release time at 75 °C (maximum)  min 12 
— — 
18 — 
30 ISO 9120  
Copper corrosion (3 h at 100 °C) (maximum)  rating  1 1 1 ISO 2160  
Corrosion -preventive properties (24 h)  rating  pass  ISO 7120 (B)  
Demulsibility d (maximum time to reach 3 ml 
emulsion at 54 °C)   
min  
30  
—  
—  
ISO 6614  
Demulsibility for THA  
— free water (minimum)  
— emulsion (maximum)  
— water in oil (maximum)   
ml 
ml 
ml  
— 
— 
—  
30 
2 
0,5  
30 
2 
0,5  
 
ASTM D 2711  
Demulsibility for THE  
— free water (minimum)  
— emulsion (maximum)  
— water in oil (maximum)   
ml 
ml 
ml  
— 
— 
—  
80 
1 
2  
80 
1 
2  
ASTM D 2711 -
01a 
(Appendix X 2)  
Oxidation stability (“TOST”)  
— time for total acid number 2 mgKOH/g (min)   
h  
1 000   
1 000   
1 000   
ISO 4263 -1 
Oxidation stability at 95 °C for THE  
— viscosity at 100 °C increase (maximum)  
— precipitation number (maximum)   
%  
6 
0.1  
6 
0.1  
6 
0.1  
ASTM D 2893 -04 
Filterability (dry) (minimum)  % 80 80 not 
required  ISO 13357 -2 
Filterability (wet)  % pass  not 
required  ISO 13357 -1 
Load carrying ability – FZG (A/8,3/90) b  
Failure load stage (minimum)   
rating   
10  
10  
10  
ISO 14635 -1 
Cleanliness at the delivery stage  c (maximum)  rating  — / 17 / 14  ISO 4406  
NOTE 1 In most cases, CKB type products (see ISO 6743 -6[3] and ISO 12925 -1[4]) may be applied for THA type products.  
NOTE 2 In some cases, where high extreme -pressure performance is requested, CKC type products (see ISO 6743 -6[3] and 
ISO 12925 -1[4]) may be applied f or THE type products.  
a  In case of dispute, ISO 6618 applies.  
b  Applies to T HE only.  
c  ISO 11500[8], using an automatic particle counter calibrated according to ISO 11171[9], is the preferred test method for 
counting and  sizing particles.  
 
  DRS 351: 2017  
17                 ©RSB 2017  All rights reserved  
 
 Table 10 — Specification for turbine oils L -THCH — Environmentally acceptable turbine oils  
(Synthetic fluids: polyalphaolefins and related hydrocarbons)  
 
Property  Unit Viscosity class  Test method  
46 68 100 
Viscosity class   46 68 100 ISO 3448  
Color  rating  report  ISO 2049  
Appearance  rating  clear and bright  Visual  
Kinematic viscosity at 40 °C  
— at –20 °C maximum  
— at 0 °C maximum  
— at 40 °C minimum  
— at 40 °C maximum  
— at 100 °C minimum   
mm2/s  
a 
780 
41,4 
50,6 
6,1  
a 
1 400  
61,2 
74,8 
7,8  
a 
1 500  
90,0 
110,0  
10  
 
ISO 3104  
Viscosity index   report  ISO 2909  
Pour point (maximum)  0C -15 -12 -9 ISO 3016  
Density at 15 °C  kg/m3 report  ISO 12185 or  
ISO 3675  
Flash point open cup (minimum)  0C 186 196 206 ISO 2592  
 
Total acid number (maximum) b  
mg KOH/g   
report  a ISO 6618 or  
ISO 6619 or  
ISO 7537  
Water content (maximum)  % (m/m) 0,02 0,02 0,02 ISO 6296 or  
ISO 12937  
Foaming (tendency/stability) (maximum) c  
— sequence 1 °C at 24 °C  
— sequence 2 °C at 93 °C  
— sequence 3 °C at 24 °C after 93 °C   
ml/ml  
ml/ml  
ml/ml   
150/0 
70/0 
150/0  
150/0  
70/0 
150/0   
150/0  
70/0 
150/0   
ISO 6247  
Air release time at 50 °C (maximum)  min 10 10 14 ISO 9120  
Copper corrosion (3 h at 100 °C) (maximum)  rating  1 1 1 ISO 2160  
Corrosion -preventive properties (24 h)  c rating  pass  ISO 7120 (B)  
Demulsibility d (maximum time to reach 3 ml 
emulsion at 54 °C)   
min  
report a  
ISO 6614  
Oxidation stability (“TOST”)  
— time for total acid number 2 mgKOH/g (min)   
h  
report a  
ISO 4263 -1 
Filterability (dry) (minimum)  % 80 80 80 ISO 13357 -2 
Filterability  (wet)  % pass  ISO 13357 -1 
Load carrying ability – FZG (A/8,3/90)   
Failure load stage (minimum)   
rating   
10  
10  
10  
ISO 14635 -1 
Toxicity d  
— acute Fish toxicity LL50 (minimum)  
— acute Daphnia toxicity EC 50 (minimum)  
— bacteria Inhibition 3 h EC 50 (minimum)   
mg/l 
mg/l 
mg/l  
100 
100 
100  
100 
100 
100  
100 
100 
100  
ISO 7346 -2 
ISO 6341  
ISO 8192  
Biodegradability (minimum) e  % 60 60 60 ISO 14593 or  
ISO 9439  
Cleanliness at the delivery stage f (maximum)  rating  — / 17 / 14  ISO 4406  
NOTE  See also category HEPR, as per ISO 6743 -4[1] and ISO 15380[5].  
a  To be negotiated between the end user and the supplier.  
b  In case of dispute, ISO 6618 applies.  
c Test duration changed from 24 h (ISO 7120) to 4 h and a longer or shorter duration may be negotiated.  
d Water soluble fluids shall be tested according to the test methods cited. Fluids with low water solubility shall be tested using 
water accommodated fractions prepared according to ASTM D 6081 or ISO 10634.  
e Without 10 days window requirem ent. Some national requirements may be more severe.  
f  ISO 11500[8], using an automatic particle counter calibrated according to ISO 11171[9], is the preferred test method for 
counting and sizing particles.  
 
   
©RSB 2017  All rights reserved                  18 
 
 Table 11 — Specification for turbine oils L-THCE — Environmentally acceptable turbine oils  
(Synthetic fluids: synthetic ester types)  
 
Property  Unit Viscosity class  Test method  
46 68 100 
Viscosity class   46 68 100 ISO 3448  
Color  rating  report  ISO 2049  
Appearance  rating  clear and bright  Visual  
Kinematic viscosity at 40 °C  
— at –20 °C maximum  
— at 0 °C maximum  
— at 40 °C minimum  
— at 40 °C maximum  
— at 100 °C minimum   
mm2/s  
a 
780 
41,4 
50,6 
6,1  
a 
1 400  
61,2 
74,8 
7,8  
a 
1 500  
90,0 
110,0  
10  
 
ISO 3104  
Viscosity index   report  ISO 2909  
Pour point (maximum)  0C -15 -12 -9 ISO 3016  
Density at 15 °C  kg/m3 report  ISO 12185 or  
ISO 3675  
Flash point open cup (minimum)  0C 186 196 206 ISO 2592  
 
Total acid number (maximum) b   
mg KOH/g   
report a ISO 6618 or  
ISO 6619 or  
ISO 7537  
Water content (maximum)  % (m/m) 0,02 0,02 0,02 ISO 6296 or  
ISO 12937  
Foaming (tendency/stability) (maximum) c  
— sequence 1 °C at 24 °C  
— sequence 2 °C at 93 °C  
— sequence 3 °C at 24 °C after 93 °C   
ml/ml  
ml/ml  
ml/ml   
150/0  
70/0 
150/0   
150/0  
70/0 
150/0   
150/0  
70/0 
150/0   
ISO 6247  
Air release time at 50 °C (maximum)  min 10 10 14 ISO 9120  
Copper corrosion (3 h at 100 °C) (maximum)  rating  1 1 1 ISO 2160  
Corrosion -preventive properties (24 h) c rating  pass  ISO 7120 (B)  
Demulsibility d (maximum time to reach 3 ml 
emulsion  at 54 °C)   
min  
report a  
ISO 6614  
Oxidation stability (“TOST”)  
— time for total acid number 2 mgKOH/g (min)   
h  
report a  
ISO 4263 -3 c 
Oxidation stability Baader test 72 h at 110 °C  
Viscosity at 40 °C increase (maximum)   
%  
20  
20  
20  
DIN 51554 -3 
Filterability (dry) (minimum)  d % 80 80 80 ISO 13357 -2 
Load carrying ability – FZG (A/8,3/90)  
Failure load stage (minimum)   
rating   
10  
10  
10  
ISO 14635 -1 
Toxicity  e 
— acute Fish toxicity LL50 (minimum)  
— acute Daphnia toxicity EC 50 (minimum)  
— bacteria Inhibition 3 h EC 50 (minimum)   
mg/l 
mg/l 
mg/l  
100 
100 
100  
100 
100 
100  
100 
100 
100  
ISO 7346 -2 
ISO 6341  
ISO 8192  
Biodegradability (minimum)  f % 60 60 60 ISO 14593 or  
ISO 9439  
Cleanliness at the delivery stage f (maximum)  rating  — / 17 / 14  ISO 4406  
NOTE  See also category HE ES, as per ISO 6743 -4[1] and ISO 15380[5].  
a  To be negotiated between the end user and the supplier.  
b  In case of dispute, ISO 6618 applies.  
c The oxidation stability test is performed without water.  
d ISO 13357 -2 applies normally to mineral oils; compatibility between the fluid and the membrane has to be checked before 
testing.  
e Water soluble fluids shall be tested according to the test methods cited. Fluids with low water solubility shall be tested us ing 
water ac commodated fractions prepared according to ASTM D 6081 or ISO 10634.  
f Without 10 days window requirement. Some national requirements may be more severe.  
f  ISO 11500[8], using an automatic particle counter calibrated according to ISO 11171[9], is the pref erred test method for 
counting and sizing particles.  
 
  DRS 351: 2017  
19                 ©RSB 2017  All rights reserved  
 
 Table 12 — Specification for turbine oils L -TSD and L -TGD  
(Phosphate esters)  
 
Property  Unit Viscosity class  Test method  
32 46 
Viscosity class   32 46 ISO 3448  
Color  rating  report  ISO 2049  
Appearance  rating  clear and bright  Visual  
Kinematic viscosity at 40 °C  
— at 0 °C maximum  
— at 40 °C minimum  
— at 40 °C maximum   
mm2/s  
2 000  
28,8 
35,2  
2 500  
41,4 
50,6  
ISO 3104  
Viscosity index   report  ISO 2909  
Pour point (maximum)  0C -15 -15 ISO 3016  
Density at 15 °C  kg/m3 1 200  1 200  ISO 12185 or  
ISO 3675  
Fire point (minimum)  0C 300 300 ISO 2592  
Manifold -ignition test (minimum)  0C 700 700 ISO 20823  
Wick -flame persistence (maximum)  s 10 10 ISO 14935  
 
Total acid number (maximum) a   
mg KOH/g   
0.1  
0.1 ISO 6618 or  
ISO 6619 or  
ISO 7537  
Water content (maximum)  % (m/m) 0,10 0,10 ISO 760 or  
ISO 20764  
Foaming (tendency/stability) (maximum)  
— sequence 1 °C at 24 °C  
— sequence 2 °C at 93 °C  
— sequence 3 °C at 24 °C after 93 °C   
ml/ml  
ml/ml  
ml/ml   
150/0 
30/0 
150/0  
150/0 
30/0 
150/0  
ISO 6247  
Air release time at 50 °C (maximum)  min 5 6 ISO 9120  
Copper corrosion (3 h at 100 °C) (maximum)  rating  1 1 ISO 2160  
Demulsibility d (maximum time to reach 3 ml 
emulsion at 54 °C)   
min  
15  
15  
ISO 6614  
Oxidation stability  
— acid number (maximum)  
— mass change Fe (maximum)  
— mass change Cu (maximum)   
mg KOH/g  
mg 
mg  
1,5 
1,0 
2,0  
1,5 
1,0 
2,0  
EN 14832  
Hydrolytic stability  
— Acid number (maximum)   
mg KOH/g   
0.5  
0.5  
EN 14833  
Cleanliness at the delivery stage b(maximum)  rating  — / 17 / 14  ISO 4406  
a  In case of dispute, ISO 6618 applies.  
b  ISO 11500[8], using an automatic particle counter calibrated according to ISO 11171[9], is the preferred test method for 
counting and sizing particles.  
   
©RSB 2017  All rights reserved                  20 
 
 7 Packaging and labelling  
7.1 Pack aging 
The condition of the drums or smaller containers and the bulk tankers into which the oil is filled shall be such 
as to have detrimental effect on the quality of the oil during normal transportation and storage. Only containers 
of the sa me size filled with oil of the same batch identification shall be packaged together in a carton . 
7.2 Labell ing (see if any ref std)  
7.2.1  Each container  shall be securely closed and labelled  with the following information:  
a) the manufacturer’s identification and/or distributor’s name;; 
b) ISO classification ; 
c) Viscosity Grade  
d) Net mass in the containe r 
e) Batch number or code number;  
f) Date of manufacture;  
g) shelf life (best before)  
h) country of origin  
i) safety symbol  
k) Recognized trade -mark, if any with identification in code of otherwise to enable the lot of consignment or  
manufacturer to be traced back.  
7.2.2  Small containers packed in cartons, the batch identification may be marked on each carton only.  
7.2.3  Lubric ants packed in bulk tankers, the batch identification shall be marked on the consignment 
documents.  
8 Sampling  
Unless otherwise specified in commodity specifications, samples shall be taken  in accordance with ISO 3170  
9 Test methods  
 
The requirements enumerated in t ables (from 5 to 13)  specification shall be determined in accordance with the 
ISO methods indicated in above table s.DRS 351: 2017  
ICS 75.100  
 
 
©RSB 2017  All right s reserved