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D4156-14 – Standard Test Method Technical Guide
📐 Scope and Referenced Standards
ASTM D4156-14 provides a performance specification for knitted fabrics used in women’s and girls’ sportswear, covering any fiber type or blend. The requirements are applicable to both length and width directions for relevant properties. The standard incorporates numerous ASTM and AATCC test methods to ensure quality and performance.
| 🟦 Standard | 📏 Title | 🎯 Category |
|---|---|---|
| ASTM D2594 | Stretch Properties of Knitted Fabrics Having Low Power | Elasticity |
| ASTM D3786 | Bursting Strength – Diaphragm Method | Strength |
| AATCC 15 | Colorfastness to Perspiration | Colorfastness |
| AATCC 61 | Colorfastness to Laundering: Accelerated | Colorfastness |
| AATCC 135 | Dimensional Changes of Fabric after Home Laundering | Dimensional Stability |
📊 Specification Requirements
According to Section 4.1, knitted fabrics must conform to the requirements in Table 1 of the standard. This table specifies criteria for bursting strength, colorfastness to crocking, perspiration, light, laundering, drycleaning, and bleach, as well as dimensional change and appearance after laundering. Performance levels are evaluated using the referenced AATCC and ASTM methods. For example, color change is assessed using the Gray Scale for Color Change (Evaluation Procedure 1).
💡 Note: Reference to test methods in this standard give only the permanent part of the designation. The current editions of each test method cited shall prevail (see Note 1).
⚙️ Testing and Compliance
The standard emphasizes proper sampling and safety. Sampling should follow MIL-STD-105D for inspection by attributes. Additionally, compliance with the Flammable Fabrics Act (16 CFR Chapter II) is required. Users are responsible for establishing safety and health practices and determining regulatory limitations (Section 1.3).
⚠️ Safety: This standard does not purport to address all safety concerns. It is the user’s responsibility to establish appropriate practices and comply with regulations before use.
❓ Frequently Asked Questions
🔍 What types of fabrics are covered by this standard?
Knitted fabrics of any textile fiber or mixture used in women’s and girls’ sportswear, as per Section 1.1.
💡 How is colorfastness to light tested?
According to AATCC 16.3, Colorfastness to Light: Xenon-Arc, as referenced in the standard.
⚡ What is the bursting strength requirement for these fabrics?
Bursting strength is evaluated using ASTM D3786 or D3787, with specific minimum values provided in Table 1 of the standard.
📌 Are there any regulatory requirements referenced?
Yes, the standard references 16 CFR Chapter II for flammability and MIL-STD-105D for sampling procedures.