ISO 20920:2018 PDF

Name: ISO 20920:2018 — Textiles — Man-made fibres — Determination of dye uptake of cationic dyeable modified polyester fibres
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Textiles — Man-made fibres — Determination of dye uptake of cationic dyeable modified polyester fibres

Название (английский):

ISO 20920:2018

Textiles — Man-made fibres — Determination of dye uptake of cationic dyeable modified polyester fibres

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 17 сентября 2018 г.
Издание:: ISO IS 20920 edition 1 version 1
ICS:: 59.060.20

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Описание (английский):

This document specifies a method for determining the dye uptake of cationic dyeable modified polyester fibres by using cationic dye. It is applicable to cationic dyeable modified polyester fibres, including staple fibres and filament yarns. It is not applicable to polyester partially oriented yarns.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 20920:2018 specifies a standardized laboratory method for determining the dye uptake of cationic dyeable modified polyester fibres using a cationic dye. The method applies to cationic dyeable polyester (CDP) and easy cationic dyeable polyester (ECDP) fibres, including staple fibres and filament yarns, but excludes polyester partially oriented yarns. The test evaluates how much dye is absorbed by fibre specimens by spectrophotometric comparison of residual dye in solution.

Key topics and technical requirements

Principle: Dye specimens with a defined cationic dye solution, measure the residual dye absorbance spectrophotometrically, and calculate dye uptake by comparison with a blank.

Reagents & materials:

Grade 3 water (ISO 3696)
Cationic red X‑GRL (10 g/L stock solution; prepared by dissolving 1 g dye in 100 ml water)
Acetate buffer (pH 5), soap per ISO 105‑C10

Apparatus & conditions:

Spectrophotometer with 1 cm cuvette; measure at peak wavelength (532 nm)
Dyeing machine capable of (100 ± 3) °C; heating rate (1.5 ± 0.5) °C/min
Liquor ratios: pre-wash 50:1; dyeing 100:1

Procedure essentials:

Two specimens of 1.5 g each are tested.
Prepare an 80 mg/L working dye solution (dilution of the 10 g/L stock with buffer).
Dye at 100 °C for 60 minutes, cool, dilute solutions to absorbance between 0.1–0.5, and measure at 532 nm.
Calculate uptake: ω = (1 − (Ai·ni) / (A0·n0)) × 100 (%) and report the arithmetic mean of two specimens to 0.1%.

Pre-treatment & conditioning:

Launder to remove oils (optional if oil content is shown not to affect results); condition per ISO 139.

Quality & precision:

Annex A provides precision data (repeatability and reproducibility). Example values: CDP staple fibre r = 3.62%, R = 4.94%; ECDP staple fibre r = 2.42%, R = 2.49%.

Traceability: Record specimen ID, mass, dye concentration, test date and any anomalies in the test report.

Applications and who uses it

Textile fibre and yarn manufacturers evaluating dyeability of modified polyester (CDP, ECDP)

Dyeing and finishing laboratories performing quality control and R&D

Raw material suppliers, procurement teams, and compliance/technical buyers assessing dye uptake performance

Test houses requiring a reproducible, comparable method for internal QC, product specifications and supplier acceptance

Related standards

ISO 139 - Standard atmospheres for conditioning and testing

ISO 3696 - Water for analytical laboratory use

ISO 105‑C10 - Colour fastness to washing (soap)

ISO 5725‑2 - Precision of measurement methods (used for precision analysis in Annex A)

Keywords: ISO 20920, dye uptake, cationic dyeable polyester, CDP, ECDP, textile testing, spectrophotometer, cationic dye, dyeing procedure, laboratory method.

ISO 20920:2018 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

SIST EN ISO 3696:1998

Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)

BS EN ISO 10565:1998

Oilseeds. Simultaneous determination of oil and water contents. Methods using pulsed nuclear magnetic resonan…

BS EN ISO 13904:2016

Animal feeding stuffs. Determination of tryptophan content.

SIST ISO 5725-2:2020

Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determina…

BS ISO 20920:2018

Textiles. Man-made fibres. Determination of dye uptake of cationic dyeable modified polyester fibres.