ISO 23324:2020

INTERNATIONAL ISO
STANDARD 23324
First edition
2020-11
Surface active agents — Fabric
conditioners — Determination of
antistatic performance
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Test fabric material . 2
6 Apparatus and materials. 2
7 Procedure. 3
7.1 Preparation of test clothes . 3
7.1.1 Washing of test clothes . 3
7.1.2 Drying of test clothes . 3
7.2 Preparation of conditioner solution . 4
7.3 Measurement of surface resistance . 4
7.3.1 Measurement conditions . 4
7.3.2 Measurement of surface resistance . 4
8 Expression of results . 4
8.1 Method of calculation . 4
8.1.1 Fabric surface resistance (R ) . 4
s
8.1.2 Fabric surface resistance coefficient (ρ ) . 4
s
8.1.3 Decrease of fabric surface resistance coefficient (Δρ ) . 5
s
8.1.4 Decrease of the logarithm of fabric surface resistance coefficient (Δlgρ ) . 5
s
8.2 Expression of results . 5
9 Test report . 5
Annex A (informative) Technical specifications for speed controller . 7
Annex B (informative) . 9
Bibliography .12
Foreword
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electrotechnical standardization.
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different types of ISO documents should be noted. This document was drafted in accordance with the
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iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 91 Surface active agents.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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iv © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 23324:2020(E)
Surface active agents — Fabric conditioners —
Determination of antistatic performance
1 Scope
This document specifies a method for the determination of static electricity elimination (antistatic)
performance.
This document is applicable to fabric conditioners and antistatic agents.
NOTE The differences between this document and some International Standards related to static electricity
on textiles are listed in Annex B.
2 Normative references
There are no normative references in this document.
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/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
fabric surface resistance
R
s
resistance measured when electric current flows through the surface of fabric
3.2
fabric surface resistance coefficient
ρ
s
surface resistance measured by two electrodes of unit length placed on the fabric surface with the
distance of unit length between them
Note 1 to entry: Unit length is expressed in centimetres.
3.3
antistatic agent
product used to treat fabric for eliminating static electricity
3.4
fabric conditioner
product with both antistatic and softening function, which generally contains cationic surface
active agents
4 Principle
The electrostatic effect of fabric is subject to not only the amount of static electricity generated, but
also the dissipation capacity of electrostatic charge. The fabric surface resistance is a physical quantity
characterizing the electrostatic charge attenuation velocity of fabric. Soak the test fabric material in
fabric conditioner solution under specified conditions. Measure the surface resistance of the test fabric
material with ultra-high resistance meter before and after soaking. Assess the antistatic performance
for fabric conditioner with the decrease of the surface resistance coefficient (Δρ ) or the decrease of the
s
logarithm of the surface resistance coefficient (Δlgρ ).
s
5 Test fabric material
5.1 Polyester, white or milky woven twill, with warp 428 threads per decimetre and weft 242 threads
per decimetre.
Polyester of other specifications or cloth of other textures can be used. However, only the comparative
test result of antistatic performance for different fabric conditioners can be provided, which shall be
included in the test report.
6 Apparatus and materials
6.1 Digital ultra-high resistance meter, with three coaxial electrodes and measuring range from
3 16
1 × 10 Ω to 1 × 10 Ω. The intrinsic error within limits shall not exceed 10 % of the indicated value.
The pressure that the electrodes press on sample shall be 100 g/cm . Structure size of coaxial-electrode
system is shown in Figure 1.
Dimensions in millimetres
Key
1 measuring electrode
2 shield electrode
3 test sample
4 high-voltage electrode
D inner diameter of the circular shield electrode
d diameter of the measuring electrode
Figure 1 — Coaxial-electrode system
6.2 Oven, regulated at a temperature of (45 ± 2) °C.
6.3 Humidistat. A glass desiccator containing potassium carbonate-saturated solution can be used.
The relative humidity (RH) of air at equilibrium shall be 43 % for a temperature between 10 °C and 30 °C.
2 © ISO 2020 – All rights reserved

6.4 Vegetable dehydrator (see Figure 2). Diameter of the upper rim of outer basket shall be (26 ± 3)
cm, and the height shall be (17 ± 2) cm.
a)  Overall photo b)  Top cover c)  Bottom basket
Figure 2 — Vegetable dehydrator
6.5 Speed controller (optional), for use with the vegetable dehydrator (6.4). See Annex A.
6.6 Soap flakes, neat soaps, soap powder or soap base, with dried sodium soap content ≥ 54 %.
6.7 Miscellaneous tools, scissors, ruler, filter paper, plastic tweezers, plastic clip and thermometer.
7 Procedure
7.1 Preparation of test clothes
7.1.1 Washing of test clothes
Cut 10 cm selvage off the polyester fabric, then cut it into 100 mm × 100 mm test clothes.
Dissolve soap flakes (6.6) in distilled water or deionized water to obtain a soap solution with a
concentration of 1g/l of dried sodium soap.
...