ISO 18066:2015

Textiles - Manmade filament yarns - Determination of shrinkage in boiling water

ISO 18066:2015 specifies a test method for the determination of the boiling water shrinkage of non-textured and textured multifilament yarns (made of polyester, polyamide, polypropylene, cellulose fibre, etc.) Only automatic method is specified in this International Standard. This International Standard is applicable to manmade filament yarns of linear density less than 3 000 dtex. This International Standard is not applicable to partially oriented yarns.

Textiles — Fils de filaments synthétiques — Détermination du retrait dans l'eau bouillante

General Information

• Status: Published
• Publication Date: 01-Apr-2015
• ICS: 59.080.20 - Yarns
• Technical Committee: ISO/TC 38/SC 23 - Fibres and yarns
• Drafting Committee: ISO/TC 38/SC 23/WG 6 - Fibres - Man-made
• Current Stage: 9092 - International Standard to be revised
• Start Date: 31-Oct-2024
• Completion Date: 13-Dec-2025

Overview

ISO 18066:2015 specifies an automatic test method for determining the boiling water shrinkage of manmade multifilament yarns (polyester, polyamide, polypropylene, cellulose‑based, etc.). It applies to non‑textured and textured multifilament yarns with linear density < 3 000 dtex and is not applicable to partially oriented yarns. The standard gives requirements for sampling, specimen preparation, test apparatus, test conditions and calculation of shrinkage (%) after thermal treatment in boiling water.

Key topics and technical requirements

• Scope and applicability: Multifilament filament yarns; only the automatic method is specified.
• Sampling and specimen preparation: Minimum lab sample sizes (minimum 20 tests per lot; at least 2 specimens per package) and instructions for winding skeins with specified set linear density (e.g., set T = 2 500 dtex for nominal ≤ 400 dtex; ~10 000 dtex for > 400 dtex to ~3 000 dtex).
• Apparatus:
  • Automatic shrinkage tester with specimen holder (>600 mm), length‑measuring resolution of 0.05 mm and auto tension application. A small 2.5 cN hanging weight is used to avoid entanglement.
  • Boiling water container adjustable to 100 °C (±3 °C) big enough to immerse the specimen holder.
  • Ventilated oven for controlled drying (interior ≥ 600 mm; temperature control ±3 °C).
• Tension control: Tension is calculated per the standard using the specified tension per unit linear density: 0.05 ± 0.005 cN/dtex for non‑textured yarns and 0.20 ± 0.02 cN/dtex for textured yarns.
• Test cycle and conditioning: Precondition per ISO 139. Equilibrium times: >2 h before treatment, >4 h after. Immerse specimens in boiling water (with 1 g/L wetting agent if used) for 30 ± 5 min. Drain for 10 min and dry in oven at 55 ± 3 °C for 30 min (or air‑dry to equilibrium).
• Measurement and calculation: Measure straightened length before and after treatment (measurements to 0.1 mm accuracy). Boiling water shrinkage (BWS) is expressed as a percentage:
  BWS = (L0 − L1) / L0 × 100
  where L0 = length before treatment, L1 = length after treatment.
• Precision: Annex A reports repeatability and reproducibility data across materials (repeatability r ≈ 0.08–0.24; reproducibility R up to ≈ 1.51 for some yarn types).

Applications and who uses it

ISO 18066 is used for quality control, product specification, R&D and supplier acceptance testing in the textile industry. Typical users:

• Yarn manufacturers and spinners (multifilament yarn quality)
• Textile testing laboratories and third‑party test houses
• Textile mills and fabric converters assessing dimensional stability
• Procurement and compliance teams specifying shrinkage limits in contracts

The standard helps ensure consistent measurement of boiling water shrinkage for manufacturing control, performance claims and comparative testing.

Related standards

• ISO 139 (standard atmospheres for conditioning and testing)
• ISO 3696 (water for laboratory use)
• EN 14621 and BISFA test methods (related filament yarn test methods)
• ISO 8160 / ISO 10132 (textured filament yarn terminology and definitions)

Keywords: ISO 18066, boiling water shrinkage, manmade filament yarns, multifilament yarn test, textile testing, automatic shrinkage tester, dtex, yarn shrinkage test.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 18066
First edition
2015-04-01
Textiles — Manmade filament yarns
— Determination of shrinkage in
boiling water
Textiles — Fils de filaments synthétiques — Détermination du retrait
dans l’eau bouillante
Reference number
©
ISO 2015
© ISO 2015
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ii © ISO 2015 – All rights reserved

Contents  Page
Foreword .iv
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4  Principle . 1
5  Apparatus and materials. 1
6  Test specimen . 3
6.1 Sampling . 3
6.2 Preparation of the test specimen . 3
6.3 Numbers of tests . 4
7  Test procedures . 4
7.1 Preconditioning and conditioning. 4
7.2 Measuring the initial length of the test specimens . 4
7.3 Boiling and drying treatment . 5
7.4 Measuring the length of the test specimens after treatment . 5
8  Calculation and expression of the results . 5
8.1 Calculation . 5
8.2 Precision . 5
9  Test report . 5
Annex A (informative) Precision experiment. 7
Bibliography . 8
Foreword
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The committee responsible for this document is ISO/TC 38, Textiles, Subcommittee SC 23, Fibres and yarns.
iv © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 18066:2015(E)
Textiles — Manmade filament yarns — Determination of
shrinkage in boiling water
1  Scope
This International Standard specifies a test method for the determination of the boiling water shrinkage
of non-textured and textured multifilament yarns (made of polyester, polyamide, polypropylene,
cellulose fibre, etc.)
Only automatic method is specified in this International Standard.
This International Standard is applicable to manmade filament yarns of linear density less than 3 000 dtex.
This International Standard is not applicable to partially oriented yarns.
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 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
3  Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
shrinkage in boiling water
decrease in length of a specimen as a result of thermal treatment in boiling water, expressed as a
percentage of its original length, which measured under tension before and after treatment
4  Principle
Under specific condition, a test specimen is treated in boiling water. Shrinkage is calculated as variation
in length, measured before and after treatment.
5  Apparatus and materials
5.1  Skein winding reel
a) Reel with a circumference of (1 000 ± 2,5) mm, driven either automatically or manually.
b) A traversing mechanism to avert overlapping while a number of skeins being wound at the same time.
c) A tensioning device, to an accuracy of ±10 %, maintaining tension within the recommended limits.
d) A device to count the turns of the reel, preferably warning or stopping winding automatically, just
prior to the specified number of reel revolutions.
e) A mechanism to reduce the reel circumference is advisable for easy removal of the skein.
5.2  Automatic shrinkage tester (see Figure 1).
a) Automatically application of the specified tension, appliance to measure the length of the specimen
and to calculate the shrinkage based on the length values.
b) Resolution of the length measurement is 0,05 mm .
c) Fitted with a specimen holder, over 600 mm high, in which a number of skeins arranged and
tested in succession. Each skein is applied with a 2,5 cN load, which remains throughout the whole
testing procedure.
Key
1 specimen
...