ISO 1833-4:2023
(Main)Textiles - Quantitative chemical analysis - Part 4: Mixtures of certain protein fibres with certain other fibres (method using hypochlorite)
Textiles - Quantitative chemical analysis - Part 4: Mixtures of certain protein fibres with certain other fibres (method using hypochlorite)
This document specifies a method, using hypochlorite, to determine the mass percentage of protein fibre, after removal of non-fibrous matter, in textiles made of mixtures of certain non-protein fibres and certain protein fibres, as follows: - wool, other animal-hair (such as cashmere, mohair), silk, protein, with - cotton, cupro, viscose, modal, acrylic, chlorofibres, polyamide, polyester, polypropylene, glass, elastane, elastomultiester, elastolefin, melamine and polypropylene/polyamide bicomponent.
Textiles — Analyse chimique quantitative — Partie 4: Mélanges de certaines fibres protéiniques avec certaines autres fibres (méthode à l'hypochlorite)
Le présent document spécifie une méthode de détermination, à l’hypochlorite, de la masse exprimée en pourcentage de fibres protéiniques, après élimination des matières non fibreuses, dans les textiles composés de mélanges de certaines fibres non protéiniques et de certaines fibres protéiniques, comme suit: — laine, autres poils animaux (par exemple cachemire, mohair), soie, protéines; avec — coton, cupro, viscose, modal, acrylique, chlorofibres, polyamide, polyester, polypropylène, verre textile, élasthanne, élastomultiester, élastoléfine, mélamine et bicomposant polypropylène/polyamide.
General Information
Relations
Overview
ISO 1833-4:2023 - Textiles - Quantitative chemical analysis - Part 4 defines a hypochlorite-based chemical method to determine the mass percentage of protein fibres in textile mixtures. The method quantifies protein fibres (wool, animal hair such as cashmere/mohair, silk) after removal of non-fibrous matter in mixtures with a wide range of non‑protein fibres (e.g., cotton, cupro, viscose, modal, acrylic, polyamide, polyester, polypropylene, glass, elastane, melamine and certain bicomponents).
This third edition (2023) updates preparation details for the hypochlorite reagent and aligns with general principles in ISO 1833-1.
Key topics and technical requirements
- Principle: Dissolve protein fibre selectively with alkaline hypochlorite; collect, wash, dry and weigh the insoluble residue. Protein content = initial dry mass − residue mass.
- Scope of fibres: Applies to mixtures of specified protein fibres with listed non-protein fibres (see scope for full list).
- Reagents:
- Sodium hypochlorite solution (active chlorine ~35 g/L; adjusted to 3.5% active chlorine for reagent) - requires iodometric checking of active chlorine.
- Lithium hypochlorite (solid) alternative - preferred for infrequent analyses because of constant hypochlorite content.
- Sodium hydroxide and dilute acetic acid for washing.
- Test procedure highlights:
- Use 100 mL of hypochlorite solution per gram of test specimen.
- Agitate continuously for 40 minutes in a water bath at (20 ± 2) °C.
- Filter, wash (water → dilute acetic acid → water), dry and weigh residue.
- Control water-bath temperature carefully - some dissolutions (e.g., wool) are exothermic and can affect results.
- Calculation details:
- Results calculated following ISO 1833-1 general instructions.
- Density correction factor d = 1.00 normally; raw cotton d = 1.03; cotton, viscose, modal, melamine d = 1.01.
- Precision: Confidence limits on homogeneous mixtures are not greater than ±1 percentage point at 95% confidence.
Applications and users
- Textile testing laboratories performing quantitative fibre composition analysis.
- Manufacturers and brand quality control teams verifying fibre declarations and compliance.
- Regulatory and inspection bodies investigating labeling disputes or fiber-content claims.
- Research groups studying blended-fabric behavior or recycling feedstock composition.
Keywords: ISO 1833-4:2023, hypochlorite method, textiles, protein fibres, quantitative chemical analysis, fibre composition, wool testing, viscose, textile quality control.
Related standards
- ISO 1833-1 - General principles of quantitative chemical analysis for textiles.
- Other parts of the ISO 1833 series for methods applicable to different fibre combinations (see ISO catalogue for the full series).
Frequently Asked Questions
ISO 1833-4:2023 is a standard published by the International Organization for Standardization (ISO). Its full title is "Textiles - Quantitative chemical analysis - Part 4: Mixtures of certain protein fibres with certain other fibres (method using hypochlorite)". This standard covers: This document specifies a method, using hypochlorite, to determine the mass percentage of protein fibre, after removal of non-fibrous matter, in textiles made of mixtures of certain non-protein fibres and certain protein fibres, as follows: - wool, other animal-hair (such as cashmere, mohair), silk, protein, with - cotton, cupro, viscose, modal, acrylic, chlorofibres, polyamide, polyester, polypropylene, glass, elastane, elastomultiester, elastolefin, melamine and polypropylene/polyamide bicomponent.
This document specifies a method, using hypochlorite, to determine the mass percentage of protein fibre, after removal of non-fibrous matter, in textiles made of mixtures of certain non-protein fibres and certain protein fibres, as follows: - wool, other animal-hair (such as cashmere, mohair), silk, protein, with - cotton, cupro, viscose, modal, acrylic, chlorofibres, polyamide, polyester, polypropylene, glass, elastane, elastomultiester, elastolefin, melamine and polypropylene/polyamide bicomponent.
ISO 1833-4:2023 is classified under the following ICS (International Classification for Standards) categories: 59.060.01 - Textile fibres in general. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 1833-4:2023 has the following relationships with other standards: It is inter standard links to ISO 15501-1:2016/Amd 1:2021, ISO 1833-4:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 1833-4
Third edition
2023-09
Textiles — Quantitative chemical
analysis —
Part 4:
Mixtures of certain protein fibres with
certain other fibres (method using
hypochlorite)
Textiles — Analyse chimique quantitative —
Partie 4: Mélanges de certaines fibres protéiniques avec certaines
autres fibres (méthode à l'hypochlorite)
Reference number
© ISO 2023
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Test procedure .2
8 Calculation and expression of results . 3
9 Precision . 3
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 38, Textiles in collaboration with the
European Committee for Standardization (CEN) Technical Committee CEN/TC 248, Textiles and textile
products, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This third edition cancels and replaces the second edition (ISO 1833-4:2017), which has been technically
revised.
The main changes n are as follows:
— in 5.1.2, the instruction for the preparation of the sodium hypochlorite solution has been detailed.
A list of all parts in the ISO 1833 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards b
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La norme ISO 1833-4:2023 se positionne comme un outil essentiel pour l'analyse quantitative chimique des textiles, notamment concernant les mélanges de certaines fibres protéiques avec d'autres fibres. Son champ d'application est clairement défini, s'attachant à une méthode utilisant l'hypochlorite pour déterminer le pourcentage massique de la fibre protéique après élimination de la matière non-fibreuse. Cela est particulièrement pertinent pour les textiles composés de mélanges spécifiques, incluant des fibres animales telles que la laine et le cachemire ainsi que des fibres non protéiques comme le coton et le polyester. Parmi les forces de cette norme, on souligne la précision et la fiabilité de la méthode proposée. En spécifiant clairement les fibres concernées – allant des soies aux fibres synthétiques telles que l'acrylique et le polyamide – l'ISO 1833-4:2023 fournit un cadre clair pour les fabricants et les laboratoires. La mise en œuvre de l'hypochlorite comme agent de référence pour l'analyse chimique renforce encore la robustesse de la méthode, garantissant des résultats cohérents et reproductibles. La pertinence de cette norme dans le secteur textile ne peut être sous-estimée. Avec l'évolution constante des matériaux utilisés dans la fabrication des textiles, la nécessité d'une standardisation et d'une méthode fiable pour l'analyse des mélanges de fibres devient primordiale. ISO 1833-4:2023 répond à ce besoin essentiel, permettant aux professionnels du secteur d'assurer la qualité des produits et de se conformer aux exigences réglementaires croissantes en matière de durabilité et de traçabilité des matériaux. Son approche méthodique et son application pratique font d'elle un standard incontournable pour toute entreprise engagée dans l'analyse des textiles.
ISO 1833-4:2023 presents a focused and essential method for the quantitative chemical analysis of textile mixtures, specifically targeting the determination of mass percentage of protein fibres in conjunction with non-protein fibres. The scope of the standard emphasizes the use of hypochlorite to effectively remove non-fibrous matter, enabling accurate assessment of protein content in textiles that can include a range of fibres such as wool, silk, and various other animal and synthetic fibres. One of the primary strengths of this standard is its comprehensive approach, addressing a diverse spectrum of materials. By accommodating a mix of protein fibres-like wool and silk-and non-protein counterparts, such as cotton and polyester, ISO 1833-4:2023 provides a valuable tool for industries working with complex textile blends. This versatility not only enhances the utility of the standard across different textile applications but also reinforces its significance in quality control and product specification. Moreover, the clarity of the methodology ensures that it can be reliably implemented across various settings, from manufacturing to laboratories. This enhances standardization in testing practices, promoting consistency and accuracy in results. Furthermore, the relevance of ISO 1833-4:2023 is underscored by its alignment with growing industry demands for transparency regarding material composition, which is increasingly critical for sustainability and product traceability. Overall, ISO 1833-4:2023 stands out as a vital resource for professionals engaged in textile analysis, providing an authoritative framework that supports both technical precision and industry-wide consistency in the measurement of protein fibres in mixed fabrics.
ISO 1833-4:2023 표준은 특정 단백질 섬유와 특정 비단백질 섬유의 혼합물에서 단백질 섬유의 질량 백분율을 결정하기 위한 방법을 명시합니다. 이 문서는 하이포클로리트(hypochlorite)를 이용한 분석 방법을 제공하며, 비섬유 물질을 제거한 후 섬유의 조성을 정량적으로 분석할 수 있는 기초를 마련합니다. 이 표준의 강점 중 하나는 다양한 섬유 조합에 대한 적용 가능성입니다. 양모, 캐시미어, 모헤어, 실크 등의 단백질 섬유와 면, 비스코스, 아크릴, 폴리에스터 등 여러 비단백질 섬유가 혼합된 경우, 이 방법을 통해 정확한 분석이 가능합니다. 이러한 특성은 섬유 산업에서의 품질 관리와 원자재 분석에 있어 큰 장점을 제공합니다. 또한, ISO 1833-4:2023는 텍스타일 분야에서의 화학 분석 방법의 표준화를 촉진하여, 연구자와 제조업체가 일관된 기준을 가지고 분석할 수 있도록 하여 신뢰성을 높입니다. 이는 섬유 혼합물의 속성을 확실히 이해하고, 그에 따른 시장 대응을 효과적으로 할 수 있는 기반을 제공합니다. 이 표준은 섬유 산업 종사자들에게 매우 중요한 역할을 하며, 단백질 섬유와 비단백질 섬유의 혼합물 분석에 있어서 필수적인 도구임을 알 수 있습니다. ISO 1833-4:2023은 이러한 분석 방법이 산업 전반에 걸쳐 통일성과 정확성을 제공하므로 매우 관련성이 높습니다.
ISO 1833-4:2023は、特定のタンパク質繊維と特定の非タンパク質繊維の混合物に関する定量的化学分析の手法を示した文書である。この標準の範囲は、羊毛、カシミヤやモヘアなどの他の動物毛、絹、及びその他の特定のタンパク質繊維を含む繊維製品において、非繊維物質を除去した後のタンパク質繊維の質量比率を、次亜塩素酸ナトリウムを用いて測定する方法を明確に定めている。 この標準の強みは、幅広い繊維材料に対応できる点である。具体的には、コットン、キュプロ、ビスコース、モダール、アクリル、塩素繊維、ポリアミド、ポリエステル、ポリプロピレン、ガラス、エラスタン、エラストマルチエステル、エラストレフイン、メラミン、ポリプロピレン/ポリアミドのバイコンポーネントまで、様々な繊維の組み合わせを対象にしている。この多様性は、テキスタイル業界において非常に重要であり、異なる製品における分析の正確性を高める。 さらに、ISO 1833-4:2023は、非タンパク質繊維の種類による影響を軽減するための基準を提供しており、標準化された手法を用いることで一貫した結果を得ることができる。この一貫性は、品質管理や製品のラベリングにおいても価値があり、消費者に対する信頼性を向上させる要素ともなりうる。 また、この標準はグローバルな準拠性を持っているため、国際的な取引や規制遵守の観点からも非常に重要である。異なる国や市場での一貫した測定基準の使用は、国際貿易における摩擦を減少させることにも寄与する。 以上の理由から、ISO 1833-4:2023はテキスタイル業界における重要な標準であり、それに基づく手法は信頼性の高い分析を提供することで、業界全体の品質向上に寄与する。
Die ISO 1833-4:2023 ist ein wesentlicher Standard im Bereich der Textilindustrie, der sich auf die quantitative chemische Analyse von Mischungen aus bestimmten Proteinfasern und anderen Fasern konzentriert. Der Standard beschreibt eine spezifische Methode zur Bestimmung des Masseanteils von Proteinfasern, nachdem nicht-faserige Stoffe entfernt wurden. Dies ist besonders relevant für Textilien, die aus Mischungen von tierischen Proteinfasern wie Wolle, Kaschmir, Mohair und Seide sowie verschiedenen nicht-proteinbasierten Fasern wie Baumwolle, Viskose und Polyester bestehen. Eine der Stärken dieses Standards liegt in seiner Fähigkeit, präzise und reproduzierbare Ergebnisse zu liefern, was für die Qualitätskontrolle in der Textilproduktion von entscheidender Bedeutung ist. Die Verwendung von Hypochlorit als Methode zur Analyse ermöglicht eine effektive Trennung der Proteinfasern von den übrigen Bestandteilen, was die Genauigkeit der Analyse erhöht. Dies trägt nicht nur zur Einhaltung von Branchenstandards bei, sondern verbessert auch das Vertrauen der Verbraucher in die angegebenen Inhalte von Textilprodukten. Die Relevanz der ISO 1833-4:2023 erstreckt sich über die Herstellung bis hin zur Vermarktung von Textilien, da sie Herstellern hilft, die Zusammensetzung ihrer Produkte genau zu bestimmen und sicherzustellen, dass sie den gesetzlichen und ökologischen Anforderungen entsprechen. Dies ist insbesondere in einem Markt von Bedeutung, in dem Verbraucher zunehmend Wert auf Nachhaltigkeit und Transparenz legen. Die klare Definition der zu analysierenden Fasermischungen fördert zudem die vergleichende Analyse zwischen verschiedenen Produkten und unterstützt die Innovationskraft in der Textilbranche. Zusammenfassend lässt sich sagen, dass die ISO 1833-4:2023 einen wichtigen Beitrag zur chemischen Analyse von Textilprodukten leistet, indem sie eine standardisierte und zuverlässige Methode zur Bestimmung des Fasermasseanteils bereitstellt. Ihre detaillierte und spezifische Ausrichtung macht sie zu einem unverzichtbaren Instrument für Unternehmen, die in der modernen Textilindustrie tätig sind.
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