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D5053-03 – Standard Test Method Technical Guide
📐 Scope and Significance
The ASTM D5053-03 (Reapproved 2023) standard defines a test method for determining the degree of color that may be transferred from the surface of leather to other materials through rubbing. This assessment can be performed under both dry and wet (damp) conditions. The test is designed to evaluate a fundamental performance characteristic of finished leathers, ensuring color stability during normal wear and handling.
⚠️ Important Limitation: This standard explicitly excludes testing on wet blue leather. The procedure and apparatus are intended for finished or crust leathers only, as specified in Section 1.1.
The values stated in inch-pound units are regarded as the standard. This test method is intended for use on any type of leather and adheres to internationally recognized standardization principles.
⚙️ Apparatus, Specimens, and Materials
The test requires specific apparatus and materials as referenced in AATCC Method 8. The primary device is the AATCC Crockmeter, which imparts a controlled rubbing motion to the test cloth against the leather specimen.
| 🟦 Component | 📏 Specification / Requirement |
|---|---|
| AATCC Crockmeter | Device for controlled rubbing per AATCC Method 8 |
| White Crock Test Cloth | Standard white cloth for detecting transferred color |
| Black Crock Test Cloth | Standard black cloth for contrast assessment |
| Assessment Scale | AATCC Chromatic Transference Scale or Gray Scale for Staining |
| Specimen Size (Minimum) | 2 in. by 5 in. (5.1 cm by 12.7 cm) |
Sampling of the leather must follow Practice D2813. For non-destructive evaluation of entire skins, the test may be conducted on any portion of the skin. All test specimens must be conditioned according to Practice D1610 prior to testing.
📊 Test Procedure and Evaluation
The test specimen is fastened to the base of the crockmeter. A white crock test cloth is then rubbed against the leather under controlled conditions. Any color transferred to the white cloth is visually assessed against a standard rating scale.
Evaluation is performed by comparing the stained cloth with the AATCC Chromatic Transference Scale. The standard also allows for the use of the Gray Scale for Staining as an alternative method, following the guidelines provided in AATCC Method 8.
| 🎯 Evaluation Scale | ⚡ Application |
|---|---|
| AATCC Chromatic Transference Scale | Primary method for rating transferred color |
| AATCC Gray Scale for Staining | Permitted alternative assessment technique |
💡 Key Note on Testing: The standard allows for testing under wet (damp) or dry conditions, or both. The specific conditioning used should be clearly noted in the test results if it deviates from the prescribed standard.
❓ Frequently Asked Questions
🔍 What is the minimum specimen size required for this crocking test?
The minimum size for the test specimen must be 2 inches by 5 inches (5.1 cm by 12.7 cm).
💡 Can finished leather articles be tested without destroying the item?
Yes. The standard states that for non-destructive testing of skins, the entire skin may be used and tested in any portion of its area.
⚡ What are the required auxiliary materials for this test?
The test requires both white and black crock test cloths. The assessment is made using the AATCC Chromatic Transference Scale or the Gray Scale for Staining.
📌 Which type of leather is explicitly excluded from this test method?
This test method does not apply to wet blue leather.