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D2050-23 – Standard Test Method Technical Guide
📐 Standard Scope and Fastener Subassemblies
ASTM D2050-23 establishes a standardized terminology for components used in the construction of textile products. This standard specifically categorizes fastener subassemblies into two primary functional groups: closure components and joining components. The closure components governed by this terminology include slide fasteners (zippers), buttons, snap fasteners, and hook and loop (touch) fasteners. The joining methods encompass stitches and seams. This standard is issued under the fixed designation D2050 and is a critical reference for harmonizing communication across the textile manufacturing and supply chain.
In addition to defining the main categories, the standard emphasizes its relationship with the broader Terminology D123, Terminology Relating to Textiles. For any terms not specifically defined within D2050, users are directed to consult D123. This ensures a comprehensive and interconnected framework of textile definitions.
⚠️ Safety and Compliance Note (Section 1.7)
The standard does not purport to address all safety concerns. It is the sole responsibility of the user to establish appropriate safety, health, and environmental practices and to determine the applicability of regulatory limitations prior to use.
The standard does not purport to address all safety concerns. It is the sole responsibility of the user to establish appropriate safety, health, and environmental practices and to determine the applicability of regulatory limitations prior to use.
⚙️ Referenced Test Methods and Standards
ASTM D2050-23 serves as a master index for test methods related to fastener subassemblies. The standard references several specific ASTM methods that are used to evaluate the performance and characteristics of these fasteners. The following table summarizes the key referenced standards for each major fastener category.
| 🟦 Fastener Type | 📐 Standard Designation | 🎯 Test Focus |
|---|---|---|
| Buttons | D5171 | Impact Resistance of Plastic Sew-Through Buttons |
| Hook and Loop (Touch) | D5169 | Shear Strength (Dynamic Method) |
| Snap Fasteners | D4846 | Resistance to Unsnapping |
| Snap Fasteners | D7142 | Holding Strength of Prong-Ring Attached |
| Slide Fasteners (Zippers) | D2060 | Measuring Zipper Dimensions |
| Slide Fasteners (Zippers) | D2061 | Strength Tests for Zippers |
| Slide Fasteners (Zippers) | D3657 | Specification for Zipper Dimensions |
💡 Technical Tip: Applying the Correct Zipper Standard
When evaluating zippers, note that D2060 covers dimensional measurement, while D2061 addresses mechanical strength. D3657 provides the overall specification. Selecting the correct standard from D2050’s framework is essential for accurate quality control outcomes.
When evaluating zippers, note that D2060 covers dimensional measurement, while D2061 addresses mechanical strength. D3657 provides the overall specification. Selecting the correct standard from D2050’s framework is essential for accurate quality control outcomes.
📏 Key Terminology for Buttons (Section 3)
Section 3 of D2050-23 provides detailed definitions specifically for the button industry, applying to sew-through flange and shank buttons. The definitions ensure uniform understanding of button construction and manufacturing. The following table outlines the primary terms defined in this section.
| 🟦 Term | 📏 Standard Definition |
|---|---|
| Button | A knot, disc, or similar designed fastener which, when forced through a narrow opening or buttonhole, joins one section of a garment to another. |
| Assembled Button | A decorative disc made from a combination of similar or dissimilar materials (e.g., plastic and metal) joined by gluing, swedging, or metal stamping. |
| Bridge | The area of a button between the holes partially covered by the sewing threads. |
| Compression Molding | A process forming a button by placing material in a confined cavity and applying pressure and heat. Typically uses thermoset compounds like urea-formaldehyde or melamine formaldehyde. |
❓ Frequently Asked Questions
🔍 What is the primary scope of ASTM D2050-23?
This standard identifies terminology related to subassemblies used in the construction of textile products. It covers closure components (slide fasteners, buttons, snap fasteners, and hook and loop fasteners) and methods for joining textile sections (stitches and seams).
💡 Which standard is referenced for testing impact resistance of buttons?
ASTM D5171, Test Method for Impact Resistance of Plastic Sew-Through Buttons, is the specific standard referenced in D2050 for testing the mechanical impact properties of plastic buttons.
⚡ What materials are specified for compression molded buttons?
Per the definition in D2050, compression molding typically uses thermoset molding compounds including urea-formaldehyde, melamine formaldehyde, and styrene-modified polyester.
📌 What is the difference between the standard D2050 and D123?
D2050 specifically covers terminology for fastener subassemblies. The standard explicitly directs users to Terminology D123 for any other terms related to textiles that are not defined within its own sections, establishing a hierarchical relationship between the two specifications.