ISO/FDIS 6956

ISO/DISFDIS 6956:2024(en)
ISO /TC 38/SC 2/WG 8
Secretariat: SAC
Date: 2025-09-1610-10
Textiles — Water resistant clothing — Determination of protection
characteristic against rainfall using a motion-manikin
Textiles — Habillement imperméable à l'eau — Détermination de caractéristique de protection contre la pluie
au moyen d'un mannequin en mouvement
FDIS stage
ISO /FDIS 6956-#:####(X:2025(en)
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ii © ISO #### 2025 – All rights reserved
ii
ISO/DISFDIS 6956:20242025(en)
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Atmosphere for conditioning and testing . 6
7 Preparation of test specimens . 7
8 Procedure . 7
9 Expression of results . 8
10 Test report . 8
Annex A (informative) General background to the rainfall simulation . 9
Annex B (informative) General background to the rain tower system . 10
Annex C (informative) Method for measuring area of underwear . 12
Bibliography . 15

Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Rain tower . 2
5.2 Motion-manikin . 3
5.3 Underwear . 4
5.4 Area measurement system . 5
6 Atmosphere for conditioning and testing . 5
7 Preparation of test specimens . 5
7.1 General . 5
7.2 Dressing and motioning the manikin . 5
8 Procedure . 5
9 Expression of results . 6
10 Test report . 6
Annex A (informative) General background to the rainfall simulation . 8
iii
ISO /FDIS 6956-#:####(X:2025(en)
A.1 Selection of raindrop condition by type of particle . 8
A.2 The world record rainfall . 8
Annex B (informative) General background to the rain tower system . 9
B.1 General information . 9
B.2 Verification of rainfall conditions . 9
B.3 Verification Result . 9
Annex C (informative) Method for measuring area of underwear . 10
C.1 Area measurement process . 10
C.2 Details of the area measurement program . 10
C.3 Environmental conditions for area measurement process . 11
Bibliography . 12
iv © ISO #### 2025 – All rights reserved
iv
ISO/DISFDIS 6956:20242025(en)
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
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The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 38, Textiles, Subcommittee SC 2, Cleaning,
finishing and water resistance test.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
ISO /FDIS 6956-#:####(X:2025(en)
Introduction
The results obtained under this test procedure do not compare with those obtained under ISO 24231, even if
some of the test conditions are similar.
This document describes a new test method that complements existing testing methods using the rain tower
system to assess the protection characteristics of garments such as protective clothing and extreme outdoor
clothing in the rainfall environment.
The results obtained under this test procedure do not compare with those obtained under ISO 24231, even if
some of the test conditions are similar.
The most widely used method of evaluating the waterproofness of clothes evaluates the performance of the
fabric, but since the characteristics of the garments (sub-material, design, etc.) were not reflected, results were
often obtained differently from the actual performance of the garment. To solve this problem, a rain tower
system that can simulate a rainfall environment has been devisedwas created, and a test method for exposing
and evaluating garments in a rainfall environment has beenwas developed and used by many companies and
research institutes in the clothing industry.
An example of the rain tower test method is ISO 24231. This test method is meaningful in that it defines the
specifications of rain tower devices, the overall test process, and the analysis of results, but, the method has
several limitations, which can reduce the accuracy of the results. First, only a single rainfall precipitation is
single conditions,condition was set: (450 ± ± 50) l/m ∙h. In order to apply to various clothing, and the
different rainfall conditions described in Annex A, conditions for various precipitations must be set. Second,
static manikin is exposed to rain with a fixed posture, resulting areas that raindrop have not been reached or
areas that have stagnated due to surface flexion, and the exclusion of the influence of left and right design
differences. Third, the test method relies on the tester’s visual judgement to obtain the test results. To solve
this problem, various types of manikins must be produced or regularly changed. This method can determine
the results differently depending on the tester, and there is a limitation in that it is difficult to obtain the degree
of wetness numerically.
Accordingly, this document describes a new standard test method that complements the limitations of existing
tests by introducing diversification of rainfall conditions through precision analysis devices, dynamic testing
through motion-manikin, and numerical outcome analysis through image analysis programs.
vi © ISO #### 2025 – All rights reserved
vi
DRAFT International Standard ISO/DIS 6956:2024(en)

Textiles — Water resistant clothing — Determination of protection
characteristic against rainfall using a motion-manikin
1 Scope
This document specifies a test method for determining the resistance to water leakage and penetration of
water-resistant clothing in an artificial rainfall using a manikin capable of marching motion. It determines the
waterproof characteristic in practical use in a rainfall environment with the wearer moving. In addition to
personal protective equipment and outdoor clothing, which require extreme conditions, it also applies to
testing common waterproof or water-repellent products such as jackets, trousers, coats, and one- or two-piece
suits.
The test method described in this document uses manikin with normal adult male size, excluding other sizes
(female, children).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 139, Textiles — Standard atmospheres for conditioning and testing
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 15831, Clothing — Physiological effects — Measurement of thermal insulation by means of a thermal
manikin
ISO 24231, Protective clothing — Protection against rain — Test method for ready-made garments against high-
energy droplets from above
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obphttps://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/https://www.electropedia.org/
3.1 3.1
water resistant clothing
waterproof or water repellent garments with the resistance to water leakage and penetration into the inside
from the outside
3.2 3.2
garment
single article of general provisions from design to distribution intended for covering the body with everything
except the footwear
Note 1 to entry: The term “garment” is intended for referring to the product.
Note 2 to entry: The garment may consist of single of multiple layers.
[SOURCE: ISO 11610:2023, 4.1.2, modified — EXAMPLE is excluded]
3.3 3.3
heavy rain
artificial rainfall with the mean amount of precipitation of (450 ± 50) l/m h
3.4 3.4
light rain
artificial rainfall with the mean amount of precipitation of (150 ± 50) l/m h
4 Principle
The water-resistant clothing to be tested is placed on the manikin wearing long underwear made of absorbent
fabric in arrangement as in practical use. The manikin, in the shape and size of an adult human body with
movable legs and arms, is exposed to artificial rainfall for a specific period with moving its legs and arms with
a defined number of movements per minute and a defined stride length. After the exposure the underwear
and the inner side of the garment are visually inspected for wet areas. In addition, an area measurement
system capable of measuring the wet area may be used in order to calculate the total wet area and wet area
on the underwear.
5 Apparatus
5.1 5.1 Rain tower, similar to a tower device as specified in ISO 24231. See 0.
A circular tub with at least 1 000 mm in diameter should be supported at least 5 000 mm above the floor, and
supplied with water from an inflow pipe. Also, the bottom of the tub should be fitted with approximately
682 nozzles with a hole diameter of 0,6 mm, at interval of 34 mm between the nozzles. The tub shall be capable
of setting a water depth in the tub in order to control the amount of precipitation.
A density and diameter of the water droplets should be correspondedcorrespond to those described in ISO
24231 (density approximately: 1 000 droplets/m , diameter approximately: 5 mm). The amount of water
2 2
shall be controllable from (150 ± 50) l/m h to (450 ± 50) l/m h in order to simulate the heavy rain and light
rain.
The condition of the rain tower can be verified by the method specified in Annex B.Annex B.
The rainfall can be controlled by the water level in the tub. When the water level is (20 ± ± 5) mm, rainfall is
2 2
(150 ± ± 50) l/m h, and when the water level reaches (45 ± ± 5) mm, rainfall becomes (450 ± ± 50) l/m h
2 © ISO 6956 2025 – All rights reserved
ISO/DISFDIS 6956:20242025(en)
min 5 000
Key
1 water filling pipe 4 protection wall
2 rain water tub 5 motion-manikin
3 nozzles
1 water filling pipe
2 rain water tub
3 nozzles
4 protection wall
5 motion-manikin
Figure 1 — Example of a rain tower with motion-manikin
5.1.1 5.1.1 To prevent a blockage of the nozzles, distilled or grade 3 water or higher as specified in ISO
3696 shall be used.
5.1.2 5.1.2 One thermometer can be placed in the room in which the test is to be carried out to measure
the air temperature. Another shall be placed in the tub to measure the temperature of the water.
5.2 5.2 Motion-manikin
4 © ISO 6956 2025 – All rights reserved
ISO/DISFDIS 6956:20242025(en)
5.2.1 5.2.1 The manikin c
...