SIST EN ISO 12127-2:2008

• Abstract:

  ISO 12127-2:2007 specifies a test method designed to evaluate the heat transfer and the behaviour of materials used for protective clothing when such materials are struck by high temperature metal particles, especially when these are trapped in the folds of the garment in working situations.; The results obtained by this method permit the comparison of the behaviour of different materials which have undergone this test under standardized conditions. They do not permit conclusions to be drawn with respect to contacts with large splashes of molten cast iron or other metal, nor do they allow the behaviour of complete garments under industrial conditions to be predicted.

• Status: Published
• Publication Date: 06-Apr-2008
• ICS: 13.340.10 - Protective clothing
• Technical Committee: OVP - Personal protecting equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 28-Feb-2008
• Due Date: 04-May-2008
• Completion Date: 07-Apr-2008
• Directive: 2016/425 - Regulation (EU) 2016/425 of the European Parliament and of the Council of 9 March 2016 on personal protective equipment and repealing Council Directive 89/686/EEC
• Directive:

  ---

  89/686/EEC - Personal protective equipment (PPE)
  OJ Ref: C 63 OJ Date: 08-Mar-2008
• Directive:

  ---

  93/68/EEC - Council Directive amending Dir. 87/404/EEC (simple pressure vessels), 88/378/EEC (safety of toys), 89/106/EEC (construction products), 89/336/EEC (electromagnetic compatibility), 89/392/EEC (machinery), 89/686/EEC (personal protective equipment), 90/384/EEC (automatic weighing instruments), 90/385/EEC (active implantable medicinal devices), 90/396/EEC (appliances burning gaseous fuels), 91/263/EEC (telecommunications terminal equipment), 92/42/EEC and 73/23/EEC
• Directive:

  ---

  93/95/EEC - Personal protective equipment (Dir. 89/686/EEC amendment)
• Directive:

  ---

  96/58/EC - Personal protective equipment (Dir. 89/686/EEC amendment)
• Mandate: M/031 - Standardization mandate to CEN/CENELEC concerning standards for Personal Protective Equipment
• Ref Project: EN ISO 12127-2:2007 - Clothing for protection against heat and flame - Determination of contact heat transmission through protective clothing or constituent materials - Part 2: Test method using contact heat produced by dropping small cylinders (ISO 12127-2:2007)

SIST EN ISO 12127-2:2008 is the Slovenian adoption of EN ISO 12127-2:2007, which is identical to ISO 12127-2:2007. It specifies a laboratory test method for measuring contact heat transmission through protective clothing or its materials when struck by high-temperature metal particles, especially small particles trapped in folds of a garment. The method is intended for comparative testing of materials used in clothing for protection against heat and flame, not for predicting the performance of a complete garment in industrial use.

What does SIST EN ISO 12127-2:2008 specify?

SIST EN ISO 12127-2:2008 specifies a test method for protective clothing materials exposed to hot metal particles. The method compares how different materials behave under standardized conditions, including heat transfer, charring, hole formation, and the temperature rise measured under the specimen.

The document is organized into the usual test-standard structure:

• Clause 1 covers scope
• Clause 2 gives terms and definitions
• Clause 3 explains the principle
• Clause 4 lists apparatus and materials
• Clause 5 sets specimen requirements
• Clause 6 gives the procedure
• Clause 7 gives precision information
• Clause 8 defines the test report
• Annex A gives interlaboratory precision data
• Annex ZA gives the relationship to EU Directive 89/686/EEC

Annex	What it covers
Annex A	Precision data from an interlaboratory test
Annex ZA	Relationship to EU PPE essential requirements

The scope is narrow in an important practical sense. The method is meant for small hot metal particles and standardized comparisons, not for large splashes of molten cast iron or other metal, and not for predicting how a complete garment will behave under real industrial conditions.

What are the key requirements of SIST EN ISO 12127-2:2008?

SIST EN ISO 12127-2:2008 uses a two-phase test sequence. Phase 1 checks whether a hot steel cylinder causes hole formation in the specimen; phase 2 measures the temperature difference under the specimen for materials that pass phase 1. In practice, that means the test first screens for visible failure and then quantifies heat transfer.

Test principle and outcome

Clause 3 states that a heated steel cylinder is dropped onto a horizontally oriented specimen. The specimen is then examined for hole formation, and the temperature under the specimen is measured with a calorimeter for the second phase. This matters because it separates destructive failure from heat-transfer performance.

Specimens and orientation

Clause 5 requires specimens of at least 180 mm by 25 mm, taken from areas more than 20 mm from the edge and free from defects. If warp and weft cannot be identified, the material is tested in two perpendicular directions. In practice, this means the sample must represent the fabric properly, because direction in woven materials can affect results.

For phase 1, at least 4 specimens are required, with 2 in each direction. For phase 2, at least 6 specimens are required, with 3 in each direction. Knitted specimens are handled without counterweights. This matters because fabric structure changes how the material stretches and how heat is transferred.

Conditioning and test atmosphere

Clause 6 requires conditioning of the specimens for at least 24 hours at 20 °C and 65 % relative humidity, followed by testing within 3 minutes of removal. The test atmosphere must be within 20 °C ± 5 °C and relative humidity between 15 % and 80 %. In practice, this controls moisture and temperature effects so results can be compared between laboratories.

Apparatus and heat source

Clause 4 defines the apparatus, including a heating oven, a steel cylinder, a steel cone, a drop guide, a calorimeter, a thermoelectric cooler, and temperature-measuring electronics. The steel cylinder is a new one for each drop, and the cone is heated to 600 °C ± 5 °C. This matters because the method depends on a repeatable heat source and consistent release of the cylinder onto the specimen.

Phase 1 - hole formation test

Clause 6.3.3 uses the support block without the calorimeter and without the cooling unit. The material fails the test if hole formation is observed in any specimen, and then phase 2 is not needed. Practically, this gives a clear pass/fail screen for surface damage and burning-through behavior.

Phase 2 - temperature difference test

Clause 6.3.4 uses the support block with the calorimeter and the cooling unit. The document requires recording the starting temperature, the maximum temperature, the cone temperature, and the temperature difference ∆T. This is the performance measure used to compare how much heat reaches the back side of the material.

Reporting and precision

Clause 8 requires reporting the sample identification, individual results, hole formation, ∆T, mean value, standard deviation, cone temperature, notable effects such as smoke or flames, the test date, and any deviation from the method. Clause 7 points to Annex A for precision data from an interlaboratory test. For users, that means the report is not just a number - it also has to show how the test was run and whether anything unusual affected the result.

What terms does SIST EN ISO 12127-2:2008 define?

• Maximum temperature (Tmax) - the highest calorimeter temperature reached after the cylinder contacts the specimen.
• Starting temperature (T0) - the calorimeter temperature at the start of temperature measurement.
• Temperature difference (∆T) - the rise from starting temperature to maximum temperature, used as the main heat-transfer result.
• Start of the temperature measurement - the instant when the solenoid is switched on.
• Cone temperature (Tc) - the temperature of the cone when it is removed from the oven.
• Hole - a scorched break in the specimen caused by charring or melting, assessed with attention to loss of threads or fabric structure.

Who uses SIST EN ISO 12127-2:2008?

SIST EN ISO 12127-2:2008 is used by laboratories testing materials for protective clothing against heat and flame, especially clothing exposed to welding-related hot particles. It is also relevant to protective clothing manufacturers, materials suppliers, quality managers, and buyers who need a standardized comparison between fabrics or garment materials.

The document is particularly relevant where hot metal droplets, sparks, or slag may lodge in folds or seams. In practice, users apply it to judge whether a material resists burning-through and how much heat passes through after contact with a small hot particle.

Which standards are used with SIST EN ISO 12127-2:2008?

SIST EN ISO 12127-2:2008 belongs to the ISO 12127 series. ISO 12127-1 covers a different contact-heat test method using a heating cylinder, while Part 2 uses contact heat produced by dropping small cylinders.

Annex ZA links this European adoption to the essential requirements of EU Directive 89/686/EEC for personal protective equipment. In practice, that annex is relevant when the standard is used as one means of showing conformity with the directive.

What does the SIST EN ISO 12127-2:2008 document contain?

The document contains the full laboratory test method, including the required apparatus, specimen preparation, conditioning, test sequence, and reporting items. It also includes figures of the dropping device, the steel cone, the cone holder, the drop guide, the support block, the calorimeter, and the thermoelectric cooler, which help users set up the equipment correctly.

Clause 6 gives the step-by-step procedure for the two phases, including the timing of heating, release, and measurement. Annex A provides precision information from an interlaboratory test, which is useful when comparing results between laboratories or checking the repeatability of the method. Annex ZA explains the relationship to EU PPE requirements.

SLOVENSKI STANDARD
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Clothing for protection against heat and flame - Determination of contact heat
transmission through protective clothing or constituent materials - Part 2: Test method
using contact heat produced by dropping small cylinders (ISO 12127-2:2007)
Schutzkleidung gegen Hitze und Flammen - Bestimmung des Kontaktwärmedurchgangs
durch Schutzkleidung oder -materialien - Teil 2: Prüfverfahren, bei dem Kontaktwärme
erzeugt wird durch kleine fallende Zylinder (ISO 12127-2:2007)
Vêtements de protection contre la chaleur et la flamme - Détermination de la
transmission thermique par contact à travers les vêtements de protection ou leurs
matériaux constitutifs - Partie 2: Méthode d'essai utilisant la transmission thermique par
contact produite par des petits cylindres compte-gouttes (ISO 12127-2:2007)
Ta slovenski standard je istoveten z: EN ISO 12127-2:2007
ICS:
13.340.10 Varovalna obleka Protective clothing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 12127-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2007
ICS 13.340.10
English Version
Clothing for protection against heat and flame - Determination of
contact heat transmission through protective clothing or
constituent materials - Part 2: Test method using contact heat
produced by dropping small cylinders (ISO 12127-2:2007)
Vêtements de protection contre la chaleur et la flamme - Schutzkleidung gegen Hitze und Flammen - Bestimmung
Détermination de la transmission thermique par contact à des Kontaktwärmedurchgangs durch Schutzkleidung oder -
travers les vêtements de protection ou leurs matériaux materialien - Teil 2: Durch fallende Zylinder erzeugte
constitutifs - Partie 2: Méthode d'essai utilisant la Kontaktwärme (ISO 12127-2:2007)
transmission thermique par contact produite par des petits
cylindres compte-gouttes (ISO 12127-2:2007)
This European Standard was approved by CEN on 21 September 2007.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12127-2:2007: E
worldwide for CEN national Members.

Contents Page
Foreword.3
Annex ZA .4

Foreword
This document (EN ISO 12127-2:2007) has been prepared by Technical Committee ISO/TC 94 "Personal
safety - Protective clothing and equipment" in collaboration with Technical Committee CEN/TC 162 "Protective
clothing including hand and arm protection and lifejackets", 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 June 2008, and conflicting national standards shall be withdrawn at
the latest by June 2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EC Directive(s).
For relationship with EC Directive(s), see informative Annex ZA, which is an integral part of this document.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 12127-2:2007 has been approved by CEN as a EN ISO 12127-2:2007 without any
modification.
Annex ZA
(informative)
Relationship between this International Standard and the Essential Requirements of
EU Directive 89/686/EEC Personal protective equipment (PPE)

This International Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide one means of conforming to Essential Requirements of
the New Approach Directive 89/686/EEC.

Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the clauses of this
standard confers, within the limits of the scope of this standard, a presumption of conformity with the
corresponding Essential Requirements of Directive 89/686/EEC, Annex II, clause 3.6.

WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling
within the scope of this standard.

INTERNATIONAL ISO
STANDARD 12127-2
First edition
2007-11-15
Clothing for protection against heat and
flame — Determination of contact heat
transmission through protective clothing
or constituent materials —
Part 2:
Test method using contact heat produced
by dropping small cylinders
Vêtements de protection contre la chaleur et la flamme —
Détermination de la transmission thermique par contact à travers les
vêtements de protection ou leurs matériaux constitutifs —
Partie 2: Méthode d'essai utilisant la transmission thermique par contact
produite par des petits cylindres compte-gouttes

Reference number
ISO 12127-2:2007(E)
©
ISO 2007
ISO 12127-2:2007(E)
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ii © ISO 2007 – All rights reserved

ISO 12127-2:2007(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 12127-2 was prepared by Technical Committee ISO/TC 94, Personal safety — Protective clothing and
equipment, Subcommittee SC 13, Protective clothing.
ISO 12127 consists of the following parts, under the general title Clothing for protection against heat and
flame — Determination of contact heat transmission through protective clothing or constituent materials:
⎯ Part 1: Test method using contact heat produced by heating cylinder
⎯ Part 2: Test method using contact heat produced by dropping small cylinders
ISO 12127-2:2007(E)
Introduction
Protective clothing designed to protect the welders is exposed to high-temperature particles generated from
the welding point into the welding environment. These hot particles are small splashes of molten metal, sparks
and slag. When the small splashes of molten metal are scattered, they produce heat into the atmosphere,
become oxidized and start to change from a molten state into a solidified state.
The diversity of the conditions in which splashes of molten metal and other hot particles may come into
contact with materials used for welder's protective clothing makes it difficult to evaluate the hazards that may
arise under conditions of use.
The most important protective function is resistance to heat transfer through the layers of clothing from high-
temperature metal drops, sparks and solidified hot particles trapped on the fabric in folds or in seamed areas.
The test method described in this part of ISO 12127 allows this heat transfer to be assessed when a hot steel
cylinder simulating a small hot particle is allowed to fall on the material. Furthermore, this method can be used
to assess charring and hole formation in the material.
This part of ISO 12127 forms a part of a series of standards concerned with clothing designed to protect
against heat and fire. This part of ISO 12127 is especially used to assess the consequences for protection of
the impact of small hot metal particles on clothing materials.
ISO 12127-1 is a revision of ISO 12127:1996.

iv © ISO 2007 – All rights reserved

INTERNATIONAL STANDARD ISO 12127-2:2007(E)

Clothing for protection against heat and flame — Determination
of contact heat transmission through protective clothing or
constituent materials —
Part 2:
Test method using contact heat produced by dropping small
cylinders
1 Scope
This part of ISO 12127 specifies a test method designed to evaluate the heat transfer and the behaviour of
materials used for protective clothing when such materials are struck by high temperature metal particles,
especially when these are trapped in the folds of the garment in working saituations.
The results obtained by this method permit the comparison of the behaviour of different materials which have
undergone this test under standardized conditions. They do not permit conclusions to be drawn with respect to
contacts with large splashes of molten cast iron or other metal, nor do they allow the behaviour of complete
garments under industrial conditions to be predicted.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
maximum temperature
T
max
maximum temperature of the calorimeter after contact of the cylinder with the sample
2.2
starting temperature
T
temperature of the calorimeter at the starting point of the temperature measurement
2.3
start of the temperature measurement
start the temperature measurement at the exact time when the solenoid is switched on
2.4
temperature difference
∆T
change in temperature between the maximum temperature reached and the temperature of the calorimeter at
the start of temperature measurement (∆T = T − T )
max 0
2.5
cone temperature
T
c
temperature of the cone when removed from the oven
ISO 12127-2:2007(E)
2.6
hole
scorched break in the test specimen caused by charring or melting of the material
NOTE The break is assessed as a hole if threads or construction of
...