DIN 53931 Textile Tests - Determination of Resistance of Textiles to Mold Fungi, Contamination Test

The standard “DIN 53931 Textile tests - Determination of the resistance of textiles to mold, contamination testing”, published by the German Institute for Standardization (DIN), describes a growth test method for evaluating how well textile materials resist mold (mildew) attack.

This testing method primarily evaluates the susceptibility of textiles (raw or treated) to fungal growth and the effectiveness of mold-preventive finishes. It is widely used in quality control within the textile industry, particularly for outdoor fabrics, technical textiles, coatings, and products exposed to humid environments.

The purpose of this standard is:

• To determine the resistance of textiles to mold fungi under controlled conditions.
• To assess the durability of antifungal or anti-mold treatments, even after processes such as watering or washing.
• To provide a qualitative or semi-quantitative assessment of fungal growth on the material.

This testing method (growth test) involves exposing textile samples to specific mold fungi in a nutrient-poor or controlled environment and incubating them under warm, humid conditions (typically around 28 degrees Celsius for 1–2 weeks, sometimes up to 28 days depending on the protocol variant).

Common test fungi mentioned in references and modified applications include:

• Aspergillus niger (ATCC 6275)
• Chaetomium globosum (ATCC 6205)

After incubation, evaluators assess fungal growth on the textile surface visually or microscopically. Results are typically graded as follows:

• No growth (best result: strong resistance or effective trading indicator)
• Mild, moderate, or intense growth

This method can also check the stability of protective coatings after washing or exposure to weathering.

The DIN 53931 standard is frequently used in product specifications and scientific research in the following areas:

• Protective textiles: Tents, awnings, outdoor fabrics, and technical textiles.
• Coatings and building materials: For example, insulation products or plasters that claim to offer mold protection.
• Antimicrobial treated fabrics: Cotton, synthetic, or sol-gel coated materials are typically tested before and after multiple washing cycles.
• Research: Evaluation of new antifungal treatments (e.g., silver-based, sol-gel, or natural compounds).

This standard is sometimes used in a modified form in conjunction with other standards such as DIN EN ISO 846 (plastics), ISO 13629 series (antifungal activity), AATCC 30 or ISO 20645 (antibacterial).

The DIN 53931 standard is relatively old and focuses on a qualitative growth test rather than modern quantitative luminescence or colony counting methods. Many laboratories use modified versions of the DIN 53931 standard for more accurate evaluation. In today's global trade, international equivalents or compatible methods (e.g., ISO 13629 standard) may be preferred.

In short, the DIN 53931 standard is a standard belonging to the broader family of textile testing methods and focuses on evaluating specific performance characteristics of textile materials under specific conditions, ensuring consistency and comparability among laboratories and industries.

This standard includes a test method for determining the resistance of textiles to specific chemical or environmental influences that may affect their durability, appearance, or structural integrity, particularly during use. This method is typically applied to fibers, yarns, and treated fabrics.

The scope may vary depending on the edition, but generally it covers the following:

• Exposure of textile products to controlled chemical substances or conditions
• Measuring any physical or visual changes that occur.
• Standardized procedures for reproducible results.

The main objective of this standard is to provide a uniform test framework for measuring textile performance in the following way:

• Reliable measurement
• Comparison between different products
• Verification of compliance with quality requirements.

Without such a standard, results from different laboratories would vary greatly due to differences in methods, conditions, and evaluation criteria.

In general, this method follows these steps:

• Sample preparation: Textile samples are prepared under controlled environmental conditions to ensure consistency.
• Exposure conditions: Samples are exposed to specific chemical substances or environmental factors (such as moisture, solutions, or other reactive substances) as defined in the standard.
• Evaluation criteria: Following exposure, textiles are evaluated for the following changes:
  • Loss of strength
  • color change
  • Surface degradation
  • Structural damage
• Reporting: Results are documented in a standardized format that allows for direct comparison between different tests and materials.

The DIN 53931 standard is widely used in industries where textiles need to withstand harsh environments:

• Automotive textiles (seat fabrics, interior materials)
• Protective clothing (chemical resistance)
• Industrial fabrics (filters, technical textiles)
• Consumer goods (clothing durability test)

The DIN 53931 standard is important because without it, textile performance tests would be inconsistent, unreliable, and often misleading. The main reasons why this standard is necessary are as follows:

• It ensures comparable results between laboratories: Different laboratories can test the same fabric and get completely different results if they use different methods. With standardization, test conditions, chemical exposure, and evaluation criteria have become comparable.
• It preserves product quality and performance: Textiles are often exposed to harsh environments (w, humidity, or industrial conditions). Without a standard, weak materials can go unnoticed, or products can fail prematurely in actual use. This standard helps verify that materials truly meet durability expectations before being released to the market.
• Reduces risk in critical applications: Failure in automotive interiors, protective clothing, and industrial textiles applications can have real-world consequences (safety risks, financial loss, or reputational damage). This standard reduces uncertainty and risk by providing a controlled way to simulate real-world stress.
• Compatibility with global standardization systems: DIN standards are generally compatible with or complement ISO frameworks. This helps to:
  • Integration of products into international markets
  • Ensuring compliance with global requirements.

In conclusion, the DIN 53931 standard plays a crucial role in ensuring that textiles can withstand specific environmental or chemical stresses. By defining a consistent and repeatable testing methodology, it supports quality control, product reliability, and global comparability—fundamental factors in modern textile production and engineering.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, 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 DIN 53931 standard.