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European Lubricants Coding - ISO 6743

ISO 6743 establishes the general classification system, which applies to lubricants, industrial oils and related products called class L. Within class L are 18 families of products defined to cover all applications for which lubricants are used. These 18 families and some of their subdivisions are shown below. Not all families have been issued. Families 16, 17 and 18 are still awaiting issue at this time.

The family is defined as an ISO standard by using a slash or a dash followed by a number. For example ISO 6743/1 or ISO 6743-1 defines Family A. The categories under family A will start with the letter A, but the letters following the initial letter, taken separately have no significance of their own. For example family AB is a total loss system for open gears or wire ropes. The second letter “B” in AB has no significance on its own. However if lubricant starts with “B”, then it is a mold release application.

Furthermore under this system a particular lubricant for an application may be designated in a complete form as “class L” followed by the family designation. Hence a reference to L-EGD would refer to a lubricant (class L) that falls into the application “EGD” symbol with the understanding that this coding refers to ISO 6743.

A viscosity grade can be used following the symbols to designate the particular grade. Hence L-HL-32 would be an R&O lubricating oil, ISO 32.

 

LUBRICANT FAMILY

ISO STANDARD

SYMBOLS

 

 

Total loss system

(ISO 6743/1)

A

          Open gears, wire ropes

AB

                     Undemanding applications

 

                             Refined mineral oils

AN

                             Unrefined mineral oils

AY

 

 

Mold release 

B

 

 

Gears 

(ISO 6743/6)

C

          Enclosed

 

                Mineral oils, R&O

CKB

                EP/AW 

CKC

                EP/AW thermally stable 

CKD

                R&O with low friction

CKE

                Splash lubrication (EP,AW)

CKG

                Extreme temperature lubricants (very low or high temperatures)

CKS

                CKS lubricants under high load

CKT

          Open gears 

 

                Asphaltic, R&O

CKH

                Asphaltic, EP

CKJ

                Grease

CKL

                Intermittent application

CKM

 

 

Compressors

(ISO 6743/3)

D

          Air compressors

 

                Reciprocating (oil lubricated compression chambers)

 

                Light duty (stage pressure ration < 3:1, discharge temp <160 C)

DAA

                Medium duty                                                                           

DAB

                Heavy duty (where coke formation may occur with DAB)

DAC

          Rotary vane or screw compressors

 

                Light duty (Discharge <800 Kpa , air temp <90 C)      

DAG

                Medium duty

DAH

                Heavy duty (Discharge pressure >1500 Kpa or air > 110 C)

DAJ

          Vacuum pumps 

 

Reciprocating, rotary drip-feed, rotary oil flooded (vane/screw)

 

                       Low vacuum for non-aggressive gas (1000 to 1 mbar)

DVA

                       Low vacuum for aggressive gas (1000 to 1 mbar)      

DVB

                Oil sealed vacuum pumps (sliding, rotary vane or plunger)

 

                       Medium vacuum for non-aggressive gas (1 to 0.001 m bar)

DVC

                            Medium vacuum for aggressive gas (1 to 0.001 m bar)

DVD

                            High vacuum for non-aggressive gas (.001 to .0000001 mbar)

DVE

                            High vacuum for aggressive gas (0.001 to 0.0000001 mbar)

DVF

          Gas compressors

 

                Non-reactive gas (use oil)  

 

                          Gases which do not contain condensable materials

DGA

                          DGA gases containing moisture or condensable materials

DGB

                Reactive gases (use synthetics)

 

                         Gases with high solubility in mineral oil that reduce viscosity

DGC

                         Gases that chemically react with mineral oil

DGD

                         Very dry inert or reducing gases with dew point –40 C

DGE

          Refrigeration compressors

 

                Ammonia evaporator above –40 C

DRA

                Ammonia evaporator below –40 C (synthetic hydrocarbon)

DRB

                Halocarbon refrigerant 

DRC

                Hydrocarbon refrigerant

DRD

 

 

Internal combustion engines

(ISO 6743/15)

E

 Two-stroke engines

EG

                         Mineral base stocks-lubricity and detergency

EGB

                         Synthetic fluid to reduce smoke and exhaust deposits

EGC

                         With Synthetic fluid and added detergency, severe service

EGD

 

 

Spindle bearings, clutches

(ISO 6743/2)

F

          Clutches, spindle bearings, bearings

FC

          Spindle bearings, bearings

FD

 

 

Slideways

(ISO 6743/13)

G

 

 

Hydraulic systems

(ISO 6743/4)

H

          Automatic transmissions

HA

          Fire resistant fluids

HF

                Oil in water emulsions (soluble oils)

HFAE

                Chemical solutions in water

HFAS

                Water in oil emulsions (invert emulsions)

HFB

                Water polymer solutions (water glycol)

HFC

                Synthetic fluids containing no water

HFD

                        Phosphate ester

HFDR

                        Chlorinated hydrocarbons

HFDS

                        Mixtures of HFDR and HFDS fluids

HFDT

                        Other compositions

HFDU

          Hydraulic-slide way

HG

          Refined mineral oil

HH

          R&O

HL

          Antiwear

HM

          Couplers & converters

HN

          High VI R&O

HR

          High VI AW 

HV

          Synthetic w/o fire resist

HS

 

 

Metal working

(ISO 6743/7)

M

                Operations needing lubrication (oil)

 

                                Fluid with antirust 

MHA

                                Fluid with fat (friction reducing)

MHB

                                Fluid with inactive S, EP without fat 

MHC

                                Fluid with active S, EP without fat

MHD

                                Fluid with inactive S with fat

MHE

                                Fluid with active S with fat

MHF

                                Greases, pastes, wax diluted with MHA

MHG

                                Soaps, powders, solids and blends thereof

MHH

                Operations needing cooling (water) 

 

 

                Soluble oils with rust prevention

MAA

                                Solubles with friction reduction

MAB

                                Solubles with EP

MAC

                                Solubles with friction reduction & EP

MAD

                                Semi-synthetics with rust prevention

MAE

                                Semi-synthetics with rust, AW &/or EP

MAF

                                Synthetics with rust preventions

MAG

                                Synthetics with friction and/or EP

MAH

                                Greases and pastes applied blended with water 

MAI

 

 

Electrical insulation

N

 

 

Pneumatic tools

(ISO 6743/11)

P

                Percussive pneumatic tools 

 

                        Non-inhibited straight mineral oil

PAA

                        Mineral oil with AW or corrosion prevention (CP)

PAB

                        Mineral oil with AW, CP, emulsifying and foam inhibition

PAC

        Synthetic base fluid lubricants

PAD

                        Greasing (semi-fluid grease)

PAE

                Rotary pneumatic tools

 

                        Non-inhibited straight mineral oil

PBA

                        Mineral oil with CP

PBB

        Mineral oil with AW, CP, emulsifying and foam inhibition

PBC

                        Synthetic base fluid lubricants

PBD

 

 

Heat transfer

(ISO 6743/12)

Q

 

 

Corrosion preventives

(ISO 6743/8)

R

                Light duty

 

                        Water-displacing fluid leaving a thin film

RA

                        Water-based fluid leaving an oily film

RB

                        RB products having water-displacing properties

RCC

                More severe duty 

 

             Undiluted fluid

RD

             RD products having water-displacing properties

RDD

             Solvent-based fluid leaving oily or greasy film

RE

                             RE products having water-displacing properties

REE

                             Solvent-based fluid leaving a waxy to dry film

RF

                             RF products having water-displacing properties

RFF

                             Solvent-based fluid leaving a bituminous film

RG

                             Water-based fluid leaving a waxy to greasy film

RH

                             Soft or thick grease

RK

                             Undiluted fluid (for protection coated materials)

RL

                             Fluid leaving waxy to dry film (to protect coated materials)

RM

                             Solvent-or water-based fluid leaving peelable film

RP

                             Plastic compound applied when melted

RT

 

 

Turbines

(ISO 6743/5)

T

                Aircraft turbines

TA

                Hydraulic

TH

                Steam turbine

 

                                Normal service, R&O

TSA

                                Synthetic fluids w/o fire-resistant properties

TSC

                                Fire resistant phosphate

TSD

                                High load-carrying ability

TSE

                Gas turbine 

 

                                Normal service with R&O

TGA

                                High temperature service with R&O

TGB

                                Synthetic fluids w/o fire-resistant properties

TGC

                                Fire-resistant (phosphate ester) for control system

TGD

                                High load-carrying ability

TGE

                Control system (phosphate)

TCD

 

 

Heat treatment

(ISO 6743/14)

U

 

 

Grease applications

(ISO 6743/9)

X

                Use 5 symbols after X 

 

                                Lower temperature (0 to <-40 C)

A through G

                                Upper temperature (+60 to >180 C)

A through G

                                Rust protection (A = bad through I = best)

A through I

                                Load (A = no EP, B = with EP)

A or B

                                NLGI Consistency 

000 to 6

 

Example X-A-A-G-B-2 (is a EP, rust inhibited #2 EP grease, 0 to +60 C range)

  (**Note differences from DIN 51512 are base fluid code, EP code and code order**)

 

 

Other applications

(ISO 6743/10)

Y

                Process oils (dust, ink, etc)

 

                               Benzene and naphthalene removal from coal gas

YA

                               Batching of fibers

YB

                               Caking prevention

YC

                               Dust suppression

YD

                               Extending rubber or plasticizing plastics (aromatic extracts)

YEA

                               Extending rubber or plasticizing plastics (naphthenics)

YEB

                               Extending rubber or plasticizing plastics (paraffinic)

YEC

                               Extending rubber or plasticizing plastics (white oil)

YED

                               Air filters for air conditioning systems

YF

                               Impregnation

YG

                               Cleaning and household

YH

                               Conditioning of leather

YL

                               Plant spraying

YM

                               Printing inks (heavy inks/absorption type printing)

YPA

                               Printing inks (light oils-heat-set drying or radiation set ink)

YPB

                               Crack detection (non-fluorescent mineral oils)

YR

                               Foam suppression

YS

                               Cosmetics (white oils)

YT

                               Pharmaceuticals (white oil)

YW

                               Electrolysis and metal plating

YX

                Testing (calibration and standardizing)

YZ

 

 

Steam cylinders

Z