Electrostatics - Part 4-9: Standard test methods for specific applications - Garments

IEC 61340-4-9:2016 provides test methods for evaluating the electrical resistance of garments that contain surface conductive or dissipative components or materials used in the electronics industry for the control of electrostatic discharge. This standard defines procedures for measuring electrical resistance, including a system resistance test for garments that provide a ground path for personnel. This edition includes the following significant technical changes with respect to the previous edition:
a) classification of three types of garments
- static control garments,
- groundable static control garments, and
- groundable static control garment system;
b) additional measurements according to the the garment type including cuff measurements, panel to groundable point, testing with a person in the garment system;
c) sleeve to sleeve measurements allowed with probes or by hanging;
d) additional recommended values for new garment types as set out in Annex A.

Électrostatique - Partie 4-9: Méthodes d'essai normalisées pour des applications spécifiques - Vêtements

L'IEC 61340-4-9:2016 fournit des méthodes d'essai pour l'évaluation de la résistance électrique des vêtements incluant des composants ou des matériaux à surface conductrice ou dissipative utilisés dans l'industrie électronique pour le contrôle des décharges électrostatiques. La présente norme définit les procédures pour mesurer la résistance électrique, y compris un essai de résistance du système applicable aux vêtements qui fournissent un chemin de mise à la terre au personnel. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
classification de trois types de vêtements
- les vêtements antistatiques,
- les vêtements antistatiques pouvant être reliés à la terre, et
- le système de vêtement antistatique pouvant être relié à la terre;
b) mesures supplémentaires selon le type de vêtement, incluant des mesures de bords-côtes, entre pièces et point pouvant être relié à la terre, des essais pratiqués avec une personne dans le système de vêtement;
c) mesures manche à manche autorisées avec des calibres ou par suspension;
d) valeurs recommandées supplémentaires pour les nouveaux types de vêtements, comme le montre l'Annexe A.

General Information

Status
Published
Publication Date
26-Apr-2016
Technical Committee
Current Stage
PPUB - Publication issued
Start Date
27-Apr-2016
Completion Date
27-Apr-2016
Ref Project

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IEC 61340-4-9
Edition 2.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrostatics –
Part 4-9: Standard test methods for specific applications – Garments
Électrostatique –
Partie 4-9: Méthodes d’essai normalisées pour des applications spécifiques –
Vêtements
IEC 61340-4-9:2016-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61340-4-9
Edition 2.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrostatics –
Part 4-9: Standard test methods for specific applications – Garments
Électrostatique –
Partie 4-9: Méthodes d’essai normalisées pour des applications spécifiques –
Vêtements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.99; 29.020 ISBN 978-2-8322-3301-6

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61340-4-9:2016 © IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 4

INTRODUCTION ................................................................................................................... 6

1 Scope ............................................................................................................................ 7

2 Normative references..................................................................................................... 7

3 Terms and definitions .................................................................................................... 7

4 Atmosphere for conditioning and testing ......................................................................... 8

4.1 General ................................................................................................................. 8

4.2 Low humidity ......................................................................................................... 8

4.3 Moderate humidity ................................................................................................. 9

5 Equipment and materials ............................................................................................... 9

5.1 Test equipment requirements ................................................................................ 9

5.1.1 Resistance measurement apparatus ............................................................... 9

5.1.2 Resistance measurement electrodes .............................................................. 9

5.1.3 Support surface ........................................................................................... 10

6 Test procedure ............................................................................................................ 10

6.1 Sample preparation ............................................................................................. 10

6.1.1 General ....................................................................................................... 10

6.1.2 Sample size ................................................................................................. 10

6.1.3 Sample sketch ............................................................................................. 10

6.2 Humidity requirements ......................................................................................... 11

6.3 Test procedures .................................................................................................. 11

6.3.1 General ....................................................................................................... 11

6.3.2 Resistance point-to-point .............................................................................. 11

6.3.3 Resistance point-to-groundable point ............................................................ 12

6.3.4 Cuff measurements ...................................................................................... 12

6.3.5 Groundable static control garment system .................................................... 12

7 Product qualification .................................................................................................... 12

8 Reporting .................................................................................................................... 13

Annex A (informative) Garment types and resistance values ............................................... 20

Annex B (informative) Data collection sheet (example) ....................................................... 21

Bibliography ....................................................................................................................... 23

Figure 1 – Test set-up – Resistance point-to-point (sleeve-to-sleeve procedure with

insulative sleeve inserts) ..................................................................................................... 13

Figure 2 – Test set-up – Resistance point-to-point (insulative sleeve inserted into

sleeve detail) ...................................................................................................................... 14

Figure 3 – Test set-up – Resistance point-to-point (panel-to-panel procedure with

insulative support surface) .................................................................................................. 14

Figure 4 – Test set-up – Resistance point-to-point (cuff-to-cuff procedure with

insulative sleeve inserts) ..................................................................................................... 15

Figure 5 – Test set-up – Resistance point-to-point (electrode inserted into cuff detail) .......... 15

Figure 6 – Test set-up – Resistance point-to-point (hanging clamp sleeve-to-sleeve

procedure) .......................................................................................................................... 16

Figure 7 – Clamps/electrodes for hanging garment test ........................................................ 16

Figure 8 – Test set-up – Resistance point-to-groundable point (cuff-to-groundable-

point procedure with insulative sleeve inserts) ..................................................................... 17

---------------------- Page: 4 ----------------------
IEC 61340-4-9:2016 © IEC 2016 – 3 –

Figure 9 – Test set-up – Resistance point-to-groundable point (sleeve-to-groundable-

point procedure with insulative sleeve inserts) ..................................................................... 17

Figure 10 – Groundable garment cuff test ............................................................................ 18

Figure 11 – Test set-up – Groundable static control garment system resistance
(groundable garment in combination with a person using a meter and hand-held

electrode) ........................................................................................................................... 18

Figure 12 – Test set-up – Groundable static control garment system resistance

(groundable garment in combination with a person using an integrated tester) ..................... 19

Table 1 – Product qualification ............................................................................................ 13

Table A.1 – Garment types and resistance values ............................................................... 20

---------------------- Page: 5 ----------------------
– 4 – IEC 61340-4-9:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROSTATICS –
Part 4-9: Standard test methods for
specific applications – Garments
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61340-4-9 has been prepared by IEC technical committee 101:

Electrostatics.

This second edition cancels and replaces the first edition published in 2010. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) classification of three types of garments
– static control garments,
– groundable static control garments, and
– groundable static control garment system;
---------------------- Page: 6 ----------------------
IEC 61340-4-9:2016 © IEC 2016 – 5 –

b) additional measurements according to the the garment type including cuff measurements,

panel to groundable point, testing with a person in the garment system;
c) sleeve to sleeve measurements allowed with probes or by hanging;
d) additional recommended values for new garment types as set out in Annex A.
The text of this standard is based on the following documents:
FDIS Report on voting
101/500/FDIS 101/502/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61340 series, published under the general title Electrostatics, can

be found on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 7 ----------------------
– 6 – IEC 61340-4-9:2016 © IEC 2016
INTRODUCTION

This part of IEC 61340 provides test methods for evaluating the electrical resistance of

garments that contain surface conductive or dissipative components or materials used in the

electronics industry for the control of electrostatic discharge. This standard defines

procedures for measuring electrical resistance, including a system resistance test for

garments that provide a ground path for personnel.

Clothing made from synthetic fibres is a common source of electrostatic charge. Wearing an

appropriate static control garment over personal clothing can minimize the effect of this

charge. To effectively control electrostatic charges, the static control garment should be

grounded.
Three categories of garments are considered in this standard.

a) A static control garment may suppress or otherwise affect an electric field from clothing

worn underneath the garment without being attached to ground. However, without

grounding, a charge may accumulate on conductive or dissipative elements of a garment,

if present, resulting in a charged source.

b) A groundable static control garment may provide a higher level of suppression when the

lower resistance fabric is connected to ground.

c) A groundable static control garment system provides a ground path for a person that

suppresses the electrical field from clothing worn underneath the garment and also bonds

the skin of the wearer to an identified ground path. Groundable static control garment

systems may also be used in conjunction with a continuous or constant monitoring system

in a manner similar to those used in continuous monitoring of wrist straps in an ESD

protected area (EPA).

Resistive characterization is only one aspect to consider in evaluating garments for any

specific application. To fully characterize a garment, electrical field attenuation, static decay,

peak voltage, residual voltage and triboelectric charging may need to be considered. Other

attributes related to applications and environments, such as cleanroom compatibility, chemical

and fire resistance, should be evaluated in the garment selection process but are beyond the

scope of this standard.

Garments constructed from fabrics made with fibres that are not surface conductive but may

have other related properties that impart some level of electrostatic charge dissipation or

suppression when connected to ground, are not specifically measured by the methods

provided in this standard.

This being the case, some garment fabrics and construction may allow for surface voltage

accumulation and charge transfer to occur which may be detrimental to electronic items.

---------------------- Page: 8 ----------------------
IEC 61340-4-9:2016 © IEC 2016 – 7 –
ELECTROSTATICS –
Part 4-9: Standard test methods for
specific applications – Garments
1 Scope

This part of IEC 61340 provides test methods for measuring the electrical resistance of

garments used for static control applications. These test methods can be used for evaluating

outer garments that are homogenously conductive or homogeneously dissipative, or that

utilize surface conductive or surface dissipative components or elements.

NOTE The test methods defined in this standard may not be able to measure materials with buried conductive

layers.

The resistance point-to-point test method tests the electrical resistance between the two

sleeves, any two panels or any two or more electrically interconnected components of the

static control garment, including the electrical resistance across the seams and cuffs of the

garment as applicable.

An alternate sleeve-to-sleeve test method is allowed, using clamps to hang a garment.

Static control garments that electrically bond to the wearer and provide a path to ground from

the wearer are evaluated using the resistance point-to-point test method, the resistance point

to groundable point test method, as well as a system test to determine the resistance from the

person through the garment to the groundable point of the garment system.

A band resistance measurement test is provided in IEC 61340-4-6 which can be used for

garments so equipped with cuffs that are intended to perform the same function as a wrist

strap band.

The system test with a person wearing a groundable static control garment system includes

the ground cord that connects to the groundable point of the garment.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 61340-2-3, Electrostatics – Part 2-3: Methods of test for determining the resistance and

resistivity of solid planar materials used to avoid electrostatic charge accumulation

IEC 61340-4-6, Electrostatics – Part 4-6: Standard test methods for specific applications –

Wrist straps
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
---------------------- Page: 9 ----------------------
– 8 – IEC 61340-4-9:2016 © IEC 2016
3.1
acceptance testing

testing used to confirm to users that products delivered are substantially the same as the

samples used to qualify products
3.2
garment system
any electrically interconnected components of static control apparel
3.3
point-to-point resistance

resistance measured from one point to another on the surface of the same panel or two

different panels of a garment
Note 1 to entry: Point-to-point resistance is expressed in ohms.
3.4
static control garments
personnel garments that are designed for electrostatic charge control
3.5
product qualification

testing used to confirm that products comply with requirements of an ESD control program or

other specification
3.6
groundable static control garment

garment that exhibits an electrical resistance from point-to-point and from any point or panel

on the garment to the groundable point on the garment

Note 1 to entry: The groundable point may be a cuff contact to the wearer’s skin or separate dedicated grounding

point connector.
3.7
groundable static control garment system

garments that are used to establish the primary ground path for a person to the groundable

point of the garment and the connection of the garment to ground, typically through a

grounding cord

Note 1 to entry: The garment shall also meet all the requirements included in the definition for groundable static

control garments.
4 Atmosphere for conditioning and testing
4.1 General

The following requirements supersede any other specification for the atmosphere for

conditioning and testing that may be given in one or more of the documents referred to in this

standard.
4.2 Low humidity

Unless otherwise agreed, the atmosphere for conditioning and testing for laboratory

evaluations at low humidity shall be at a temperature of 23 °C ± 2 °C and 12 % ± 3 % relative

humidity. The conditioning time prior to testing shall be at least 48 h.
---------------------- Page: 10 ----------------------
IEC 61340-4-9:2016 © IEC 2016 – 9 –
4.3 Moderate humidity

The atmosphere for conditioning and testing for laboratory evaluations at moderate humidity

shall be at a temperature of 23 °C ± 2 °C and 50 % ± 2 % relative humidity. The conditioning

time prior to testing shall be at least 48 h.
5 Equipment and materials
5.1 Test equipment requirements
5.1.1 Resistance measurement apparatus
5.1.1.1 General

The measurement apparatus, called the meter, whether it is a single meter or collection of

instruments, shall be capable of the following.
5.1.1.2 Product qualification

The meter shall have a circuit voltage while under load of 100 V (±5 %) for measurements of

6 6
1,0 × 10 Ω and above, and 10 V (±5 %) for measurements less than 1,0 × 10 Ω.
3 12
The meter shall be capable of making measurements from 1,0 × 10 Ω to 1,0 × 10 Ω.
5.1.1.3 Acceptance testing

The product qualification meter may be used for acceptance testing or the following:

The meter shall have an open circuit voltage of 100 V (±5 %) for measurements of 1,0 × 10 Ω

and above, and 10 V (±5 %) for measurements less than 1,0 × 10 Ω.
3 12
The meter shall be capable of making measurements for 1,0 × 10 Ω to 1,0 × 10 Ω.

In case of disagreement the meter used for product qualification will be used to resolve any

disputes.
5.1.1.4 Ohmmeter for testing personal ground path

Integrated checker or meter, whether it is a single meter (ohmmeter) or a collection of

4 8

instruments that are capable of measuring from 5,0 × 10 Ω to at least 1,0 × 10 Ω with a test

voltage from 7 V to 30 V DC open circuit.

Both test leads should be capable of being isolated from ground. AC line-powered resistance

measuring devices may give erroneous results due to undefined ground paths. Battery

powered equipment is recommended.
5.1.2 Resistance measurement electrodes
5.1.2.1 Cylindrical electrodes

A cylindrical 2,5 kg ± 0,25 kg rubber electrode with a diameter of 65 mm ± 0,5 mm, having a

contact of electrically conductive material with a Shore-A (IRHD) durometer hardness

between 50 and 70. The resistance between two electrodes should be less than 1,0 × 10 Ω

when measured at 10 V on a metallic surface.
---------------------- Page: 11 ----------------------
– 10 – IEC 61340-4-9:2016 © IEC 2016
5.1.2.2 Clamps/electrodes

The clamps/electrodes shall consist of two flat electrically conductive plates (e.g. stainless

steel) with a dimension of approximately 50 mm × 25 mm each. The clamp/electrodes shall be

electrically conductive with sufficient compression force to retain and suspend the garment.

See Figure 7.
5.1.2.3 Cuff test fixture

A test fixture comprising an insulative stand and two stainless steel cylinders approximately

25 mm in diameter, with one cylinder fixed to the stand directly above the second. The second

cylinder will weigh approximately 0,11 kg and is mounted in a slot in the stand that allows free

vertical movement. See Figure 10.
5.1.2.4 Hand-held electrode

A stainless steel, brass or copper round or tubular stock, approximately 25 mm in diameter

and 75 mm or greater in length, with provision for connection to meter (such as a banana plug

receptacle or screw connector) attached to one end of the cylinder. See Figure 11.

5.1.3 Support surface
5.1.3.1 Insulative support surface

An insulative surface when used for specimen support shall have a surface resistance of

greater than 1,0 × 10 Ω when measured in accordance with IEC 61340-2-3. The insulative

surface shall be large enough to accommodate the entire garment when it is laid out flat.

5.1.3.2 Insulative sleeve inserts

Two pieces of insulative material meeting the requirements of 5.1.3.1 cut into approximately

75 mm by 152 mm strips to slide into the sleeves (and cuffs if so equipped) of garments under

test to isolate one side of the sleeve from the other.
5.1.3.3 Insulative hangers
The points to which the clamps described in 5.1.2.2 holding a garment
...

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