SIST EN ISO 9455-9:2020

Soft soldering fluxes - Test methods - Part 9: Determination of ammonia content (ISO 9455-9:2020)

This document specifies a distillation method for the determination of the ammonia content of solid, paste or liquid fluxes. The method is applicable to fluxes of class 311 and 321 only, as defined in ISO 9454‑1.

Flussmittel zum Weichlöten - Prüfverfahren - Teil 9: Bestimmung des Ammoniumgehaltes (ISO 9455 9:2020)

Dieses Dokument legt ein Destillationsverfahren zur Bestimmung des Ammoniumgehaltes von festen, pastösen oder flüssigen Flussmitteln fest. Das Verfahren ist nur für die Flussmittel der Klassen 311 und 321 nach ISO 9454 1 anwendbar.

Flux de brasage tendre - Méthodes d'essai - Partie 9: Dosage de l'ammoniac (ISO 9455-9:2020)

Le présent document spécifie une méthode de distillation pour la détermination de la teneur en ammoniac des flux solides, en pâte ou liquides. Cette méthode est applicable uniquement aux flux de classe 311 et 321 tels que définis dans l'ISO 9454‑1.

Talila za mehko spajkanje - Preskusne metode - 9. del: Določevanje amoniaka (ISO 9455-9:2020)

General Information

• Status: Published
• Public Enquiry End Date: 29-Sep-2020
• Publication Date: 12-Nov-2020
• ICS: 25.160.50 - Brazing and soldering
• Technical Committee: VAR - Welding
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 12-Nov-2020
• Due Date: 17-Jan-2021
• Completion Date: 13-Nov-2020
• Ref Project: EN ISO 9455-9:2020 - Soft soldering fluxes - Test methods - Part 9: Determination of ammonia content (ISO 9455-9:2020)

Relations

• Replaces: SIST EN ISO 9455-9:2001 - Soft soldering fluxes - Test methods - Part 9: Determination of ammonia content (ISO 9455-9:1993)
• Effective Date: 01-Dec-2020

Overview

EN ISO 9455-9:2020 - “Soft soldering fluxes - Test methods - Part 9: Determination of ammonia content” - specifies a validated distillation titration method for measuring ammonia in solid, paste or liquid soft‑soldering fluxes. The procedure applies only to fluxes of class 311 and 321 as defined in ISO 9454‑1. The standard is intended for use by testing laboratories and manufacturers to quantify ammonia expressed as mass % of ammonium chloride.

Key topics and technical requirements

• Scope & applicability: Method restricted to flux classes 311 and 321 (see ISO 9454‑1).
• Principle: Alkaline distillation (NaOH) expels ammonia from a prepared flux solution; ammonia is absorbed into a known volume of sulfuric acid and the remaining acid is back‑titrated with standardized NaOH using methyl orange indicator.
• Sample preparation:
  • Solid/paste: weighed aliquots dissolved/diluted with water and an acid solution to clarity.
  • Liquid: measured aliquots diluted to volume.
• Reagents & apparatus: Analytical grade reagents (NaOH, H2SO4, methyl orange), water‑cooled condenser and distillation assembly per standard figure. The document includes specified reagent concentrations and preparation guidance.
• Procedure controls: Tests carried out in triplicate; precise reagent volumes and distillation/titration steps are defined.
• Calculation & units: Results reported as percentage by mass of ammonium chloride. The standard gives the calculation formula and conversion factors (e.g., 1 ml of 0.5 mol/l H2SO4 ≈ 0.0535 g NH4Cl).
• Safety: Procedures involve concentrated acids and caustic solutions - appropriate laboratory safety and trained personnel required.

Applications and users

This standard is practical for:

• Flux manufacturers performing quality control and batch release testing.
• Independent testing laboratories and compliance/quality assurance (QA) units validating flux chemical composition.
• Electronics, plumbing and HVAC industries where soldering performance and residues are sensitive to ammonia content.
• Procurement and regulatory teams requiring documented test evidence that fluxes meet chemical specifications.

Benefits include consistent, repeatable ammonia quantification for product specification, process control, regulatory compliance, and compatibility assessment with soldering processes and substrates.

Related standards

• ISO 9454‑1 - classification and coding of fluxes (referenced for flux classes 311 and 321).
• Other parts of the ISO 9455 series (soft soldering flux test methods) - consult ISO for the complete series and complementary test procedures.

Keywords: EN ISO 9455-9:2020, soft soldering fluxes, ammonia content, test methods, distillation method, flux classes 311 321, soldering flux testing, ISO 9454‑1.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2020
Nadomešča:
SIST EN ISO 9455-9:2001
Talila za mehko spajkanje - Preskusne metode - 9. del: Določevanje amoniaka (ISO
9455-9:2020)
Soft soldering fluxes - Test methods - Part 9: Determination of ammonia content (ISO
9455-9:2020)
Flussmittel zum Weichlöten - Prüfverfahren - Teil 9: Bestimmung des
Ammoniumgehaltes (ISO 9455 9:2020)
Flux de brasage tendre - Méthodes d'essai - Partie 9: Dosage de l'ammoniac (ISO 9455-
9:2020)
Ta slovenski standard je istoveten z: EN ISO 9455-9:2020
ICS:
25.160.50 Trdo in mehko lotanje Brazing and soldering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 9455-9
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2020
EUROPÄISCHE NORM
ICS 25.160.50 Supersedes EN ISO 9455-9:1995
English Version
Soft soldering fluxes - Test methods - Part 9:
Determination of ammonia content (ISO 9455-9:2020)
Flux de brasage tendre - Méthodes d'essai - Partie 9: Flussmittel zum Weichlöten - Prüfverfahren - Teil 9:
Dosage de l'ammoniac (ISO 9455-9:2020) Bestimmung des Ammoniumgehaltes (ISO 9455
9:2020)
This European Standard was approved by CEN on 1 November 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9455-9:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 9455-9:2020) has been prepared by Technical Committee ISO/TC 44 "Welding
and allied processes" in collaboration with Technical Committee CEN/TC 121 “Welding and allied
processes” the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2021, and conflicting national standards shall be
withdrawn at the latest by May 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 9455-9:1995.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 9455-9:2020 has been approved by CEN as EN ISO 9455-9:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 9455-9
Second edition
2020-10
Soft soldering fluxes — Test
methods —
Part 9:
Determination of ammonia content
Flux de brasage tendre — Méthodes d'essai —
Partie 9: Dosage de l'ammoniac
Reference number
ISO 9455-9:2020(E)
©
ISO 2020
ISO 9455-9:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 9455-9:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative reference . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Procedure. 2
7.1 General . 2
7.2 Preparation of flux test solution . 2
7.2.1 Solid fluxes . 2
7.2.2 Paste fluxes . 2
7.2.3 Liquid fluxes . . 2
7.3 Determinations . 3
8 Calculation of results . 4
8.1 Solid or paste flux samples . 4
8.2 Liquid flux samples . 4
9 Precision . 4
9.1 General . 4
9.2 Precision data . 4
10 Test report . 5
Bibliography . 6
ISO 9455-9:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
...