BISFA 2007 Test Methods for Textured Filament Yarns

The International Bureau for Standardization of Synthetic Fibers (BISFA) serves as a major global authority on technical standards for synthetic fibers. BISFA develops standardized testing methods, terminology, classification rules, and delivery conditions to ensure fair trade, consistent quality, and clear communication within the synthetic fiber industry, which includes polyester, nylon, acrylic, and cellulose fibers such as viscose and lyocell. This work is crucial because synthetic fibers vary greatly in their production processes, properties, and applications (from clothing to technical textiles and nonwovens). Without standardized rules, misunderstandings in terminology or testing can lead to disputes in international trade.

These methods apply to polyester and polyamide-based textile textured filament yarns. Textile textured filament yarns are primarily processed through warp and weft knitting and weaving, while textured carpet yarns are primarily processed through tufting. Separate manuals apply to nonwoven yarns and textured filament carpet yarns.

With the industry shifting towards technical and high-performance fibers in the 2000s, BISFA updated and published new standards in 2007, specifically for testing cellulose filament yarns (e.g., viscose or lyocell continuous filaments). These standards cover the following critical parameters:

• Sampling methods
• Commercial mass determination
• Twist measurement
• Linear density (fineness)
• Tensile properties (strength and elongation)
• Immersion absorption (absorption)
• Boiling water shrinkage
• Tendency towards fibrillation
• Statistical process control
• Terminology definitions

These rules ensure that manufacturers and buyers of textiles requiring smoothness and durability...

BISFA standards often contribute to international organizations such as ISO (e.g., the ISO 2076 standard for generic fiber names) and influence EU textile labeling regulations. They promote transparency in a global supply chain where fibers cross borders multiple times before becoming the final product.

BISFA publishes standardized test methods tailored to specific fiber types (e.g., polyester, polyamide, cellulose). These methods provide repeatable, internationally accepted procedures for evaluating fiber and yarn properties, thereby supporting quality control, fair trade, and dispute resolution in the global synthetic fiber industry.

Testing methods primarily focus on verification at the time of goods receipt. They are generally aligned with or influence ISO standards.

Common basic test methods applicable to most fiber types are as follows:

• Sampling: Rules for selecting representative laboratory samples from shipments.
• Determining the commercial mass: Calculates the agreed dry mass using conventional moisture tolerances (regardless of actual moisture content).
• Linear density (fineness): Measures mass per unit length.
• Tensile properties: Tests tensile strength, toughness, elongation at break, and modulus using constant elongation rate instruments.

BISFA 2007 also includes specific tests depending on the fiber type and application:

• Polyester filament yarns: Shrinkage (hot air or boiling water), twisting, tangling (tangling), immersion test (for tire cords).
• Cellulose filament yarns (e.g., viscose, lyocell): Immersion test, boiling water shrinkage, fibrillation tendency, statistical process control parameters.
• Short fibers (e.g., polyester, viscose, modal, acetate): Fiber length, crimp.
• Rubber cord yarns/fabrics: Adhesion (immersion test), special tensile tests for industrial use.
• Bioactive (antibacterial) fibers: Verification of antibacterial activity.
• Other types (e.g., polyamide, acrylic, elastoplefin): Similar basics plus type-specific (e.g., shrinkage, elasticity related to elastane).

These methods continue to serve as a reference for many in the industry and contribute to broader standards such as ISO 2076 (textile fiber terminology).

ISO 2076 consists of the following sections:

• Chapter 3 Sampling
• Chapter 4 Commercial Mass Determination
• Chapter 5 Determining Bending
• Chapter 6 Interference Identification
• Chapter 7 Linear density determination
• Chapter 8 Tensile Properties
• Section 9 Determining the end of the yarn, including tapering oil.
• Chapter 10 Determining curl shrinkage
• Chapter 11 Determining hot air contraction
• Chapter 12 Determining boiling water shrinkage
• Chapter 13 Statistics: terminology and calculations

BISFA test method standards, including those introduced or updated in 2007 for cellulose filament yarns (e.g., viscose, lyocell), primarily aim to provide internationally accepted, repeatable procedures for evaluating the properties of synthetic fibers and yarns. These standards serve several important purposes in the global synthetic fiber industry:

• Promoting fair and sound trade practices: By defining uniform testing rules, they create a reliable basis for trade transactions, quality verification at delivery, and dispute resolution between manufacturers, buyers, and testing laboratories.
• Ensuring consistent and comparable results: Standardized procedures (e.g., for sampling, linear density, tensile properties, shrinkage, or fiber formation) ensure that results are reproducible across different laboratories and countries, reducing misunderstandings arising from differing national methods.
• To facilitate delivery conditions and quality control: For BISFA members, they establish mandatory technical rules, including conventional tolerances (e.g., for humidity), to determine commercial mass independently of actual conditions at the time of delivery.
• Promoting open communication: Harmonized methods and terminology improve interactions between companies, customers, and consumers and often contribute to broader standards such as ISO.
• Adapting to industry evolution: As new fiber types or applications emerge (e.g., technical textiles), BISFA updates and renews its methods to include the relevant characteristics.

In the context of cellulose filament yarn standards, the updates aimed to provide modern, comprehensive testing rules, particularly for regenerative celluloses, and addressed properties critical to their performance in textiles, such as fiber retention and immersion absorption.

In general, these standards incorporate concepts acceptable to all stakeholders (manufacturers, users, laboratories) and focus primarily on verification upon receipt of goods rather than control during the production process. They continue to serve as a reference for fair trade in synthetic fibers worldwide.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its customers, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services in accordance with the "BISFA 2007 Test methods for woven filament yarns" standard.