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D4721-12 – Standard Test Method Technical Guide
📐 Scope and Applicable Products
ASTM D4721-12 (Reapproved 2019) provides a standardized practice for evaluating specific characteristics of importance in the performance of machine washable or drycleanable bedcoverings and accessories. This practice applies to woven and knit products, including bedspreads, comforters, quilts, pillow shams, dust ruffles, and blankets (Section 1.1).
It is critical to note the explicit exclusions of this practice. It does not cover bedcoverings refurbished by handwashing (Section 1.2), nor does it apply to sheets (Section 1.4). Additionally, the practice itself is not a substitute for a performance specification; instead, it provides the framework for evaluation (Section 1.3), and can be used to set purchasing specifications by mutual agreement between the purchaser and supplier (Section 1.5).
| ✅ Included Products | ❌ Excluded Products | 📝 Key Conditions |
|---|---|---|
| Bedspreads, Comforters, Quilts | Sheets | Must be machine washable or drycleanable |
| Pillow Shams, Dust Ruffles | Handwash-only items | Evaluation covers woven and knit constructions |
| Blankets | — | See also Terminology D7023 for definitions |
⚙️ Standardized Test Methods and Key Properties
The evaluation of performance relies heavily on a suite of referenced ASTM and AATCC standards. Conditioning of all test specimens must strictly follow Practice D1776 to ensure reproducible results. The table below outlines the primary properties evaluated and their corresponding test methods.
| 🟦 Evaluated Property | 📏 Referenced Standard | 🎯 Assessment Metric |
|---|---|---|
| Dimensional Change (Home Laundering) | AATCC TM135 | Percent change in length and width after specified cycles |
| Dimensional Change (Drycleaning) | AATCC TM158 | Stability in perchloroethylene drycleaning |
| Appearance Retention | AATCC TM143 | Rating of overall smoothness, pilling, and fuzzing |
| Seam Smoothness | AATCC TM88B | Seam puckering grading (SA-1 through SA-5) |
| Colorfastness (Color Change) | AATCC EP1 | Grayscale rating (Class 1 to 5) |
| Seam Failure (Woven Textiles) | ASTM D1683 | Force required to cause seam failure |
| Seam Failure (Knit Stretch Textiles) | ASTM D3940 | Bursting strength and elongation of sewn seams |
| Textile Conditioning | ASTM D1776 | Standard atmosphere for testing |
💡 Tip for Specification: Because ASTM D4721 outlines a practice rather than a fixed performance standard, all acceptable ratings for evaluating properties like dimensional change (e.g., ≤ 3% shrinkage) or colorfastness (e.g., minimum Class 4) must be agreed upon by the parties involved.
📊 Defining Terminology and Setting Agreements
Accurate application of this standard requires a clear understanding of product terminology. All relevant terms—such as comforter, quilt, sham, dust ruffle, drop, and flounce—are defined under Terminology D7023 (Relating to Home Furnishings). Further textile terminology support is provided by Terminologies D123 and D3136 (Section 3).
The standard also explicitly encourages the use of these test methods for commercial quality assurance. By referencing the specific AATCC and ASTM standards listed in Section 2, manufacturers and suppliers can establish reliable, comparable data for product development and specification verification.
✅ Regulatory and International Compliance: As noted in Section 1.7, this international standard was developed in accordance with