ISO/FDIS 817

FINAL DRAFT
International
Standard
ISO/TC 86/SC 8
Refrigerants — Designation and
Secretariat: ANSI
safety classification
Voting begins on:
Fluides frigorigènes — Désignation et classification de sécurité 2024-07-30
Voting terminates on:
2024-09-24
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MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 86/SC 8
Refrigerants — Designation and
Secretariat: ANSI
safety classification
Voting begins on:
Fluides frigorigènes — Désignation et classification de sécurité
Voting terminates on:
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
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TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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Published in Switzerland Reference number
ii
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, abbreviated terms and symbols . 1
3.1 Terms and definitions .1
3.2 Abbreviated terms .6
3.3 Symbols .7
4 Numbering of refrigerants . 7
4.1 Refrigerant Tables .7
4.2 Identifying numbers .8
4.2.1 General .8
4.2.2 First digit on the right.8
4.2.3 Second digit from the right .8
4.2.4 Third digit from the right .8
4.2.5 Fourth digit from the right .8
4.2.6 Presence of bromine (Br) or iodine (I) .8
4.2.7 Number of chlorine (Cl) atoms .8
4.2.8 Carbon atoms . .8
4.2.9 Cyclic compounds .8
4.2.10 Isomers in the ethane and ethene series .9
4.2.11 Isomers in the propane series .9
4.2.12 Isomers in the propene series.9
4.2.13 Extension to compounds of four carbon atoms .10
4.2.14 Identification of stereoisomers .10
4.3 Ether-based refrigerants .10
4.3.1 General .10
4.3.2 Two-carbon, dimethyl ethers .10
4.3.3 Straight chain, three carbon ethers . .10
4.3.4 Cyclic ethers .11
4.4 Blends .11
4.4.1 General .11
4.4.2 Zeotropes .11
4.4.3 Azeotropes .11
4.4.4 Blend tolerances . .11
4.4.5 Composition uniqueness . 12
4.5 Miscellaneous organic compounds . 12
4.6 Inorganic compounds . 13
4.6.1 General . 13
4.6.2 Compounds with relative molar masses less than 100 . 13
4.6.3 Compounds with relative molar masses equal to or greater than 100 . 13
4.6.4 Two or more inorganic refrigerants with the same molar masses . 13
5 Designation prefixes .13
5.1 General prefixes . 13
5.2 Composition-designating prefixes . 13
6 Safety classifications . 14
6.1 General .14
6.1.1 Safety classification — Composition .14
6.1.2 Toxicity classification . .14
6.1.3 Flammability classification . 15
6.2 Matrix diagram of safety group classification system.16
7 Refrigerant classifications and property data . 17
8 Refrigerant concentration limits . 17

iii
8.1 General .17
8.1.1 General .17
8.1.2 Acute-toxicity exposure limit (ATEL) .17
8.1.3 Mortality .17
8.1.4 Cardiac sensitization .18
8.1.5 Anaesthetic or central nervous system (CNS) effects .18
8.1.6 Other escape-impairing symptoms and permanent injury .19
8.1.7 Oxygen deprivation limit (ODL) .19
8.2 Data for calculations .19
8.2.1 Data sources .19
8.2.2 Consistent measures . 20
8.3 Contaminants and impurities . 20
8.4 Conversion of units — Volumic mass and altitude adjustment . 20
Annex A (infor
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