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D5548-13 – Standard Test Method Technical Guide
📋 Scope and Limitations
This standard, designated D5548-13 (Reapproved 2020), provides a laboratory screening guide for evaluating the effect of dyestuff color transfer or color loss from dyed fabrics during laundering. A critical limitation explicitly stated in the title is that it is not suitable for detergent or washing machine rankings. The guide functions solely as a laboratory screening tool for formulating detergent products or comparing two or more detergents under specific conditions. The standard emphasizes that a single test cannot provide overall product performance; a series of assessments including confirmatory tests under controlled but practical home-laundering conditions is always required to simulate consumer experience.
⚠️ Critical Limitation: This guide is explicitly designated as “Not Suitable for Detergent or Washing Machine Rankings” in its title. It is strictly a screening aid for laboratory formulation or comparative evaluation, not a definitive performance ranking method.
⚙️ Test Method and Fabric Selection
The evaluation centers on a standardized set of three dyed fabrics selected to exhibit a varying gradient of color loss or transfer potential during washing and rinsing:
- High Color Loss/Transfer: A nylon fabric dyed with a heavy concentration of a red dye, representing the greatest amount of color loss.
- Intermediate Color Loss: A cotton fabric dyed with a blue dye providing an intermediate level of color loss.
- Light Color Loss: A cotton fabric dyed with a blue dye providing a light level of color loss.
| 🟦 Fabric Type | 🎯 Dye Color | 📏 Fiber Composition | ⚡ Expected Color Loss Level |
|---|---|---|---|
| Specimen 1 | Red (Heavy Concentration) | 100% Nylon | Highest / Maximum |
| Specimen 2 | Blue | 100% Cotton | Intermediate |
| Specimen 3 | Blue | 100% Cotton | Light |
📊 Measurement and Referenced Standards
Objective evaluation of color transfer and loss is integral to this guide. It relies on established instrumental color measurement protocols from ASTM and AATCC to ensure reproducible, quantitative data:
- ASTM D1776: Standard Practice for Conditioning and Testing Textiles.
- ASTM E179: Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials.
- ASTM E1347: Test Method for Color and Color-Difference Measurement by Tristimulus Colorimetry.
- AATCC Evaluation Procedure 6: Instrumental Color Measurement.
- AATCC Evaluation Procedure 7: Instrumental Assessment of the Change in Color of a Test Specimen.
Specimens must be conditioned according to Practice D1776 prior to evaluation to ensure dimensional stability and moisture equilibrium.
💡 Best Practice: Because the guide assesses both color loss (on the original fabric) and color transfer (onto adjacent goods or solution), the instrumental methods from AATCC EP6 and EP7 provide the objective, quantitative data required for rigorous product formulation comparison.
❓ Frequently Asked Questions
🔍 Why is this guide explicitly “Not Suitable for Detergent or Washing Machine Rankings”?
The standard’s scope (Section 1.2) states that a single test can only suggest how a formulation performs under the particular conditions chosen and cannot reflect comparative product performance under the many other possible conditions of use. Confirming tests under practical home-laundering conditions are always necessary.
💡 What are the specific test fabrics and dye combinations specified?
Per Section 4.1, the guide specifies three fabrics: a nylon fabric dyed with a heavy concentration of a red dye (maximum color loss/transfer) and two cotton fabrics dyed with blue dyes representing light and intermediate levels of color loss.
📌 What units is the standard written in?
Section 1.3 specifies that values are stated in either inch-pound or SI units, both of which are to be regarded separately as the standard. Values given in parentheses are for information only.
⚡ How should color change be evaluated?
The guide relies on instrumental colorimetry. It directly references AATCC Evaluation Procedure 6 (Instrumental Color Measurement) and Evaluation Procedure 7 (Instrumental Assessment of Change in Color), along with ASTM E1347 for tristimulus colorimetry, ensuring objective, repeatable measurements of dye transfer and color loss.