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D4030 – Standard Test Method Technical Guide
This specification provides requirements for continuous glass filament sewing thread and continuous filament cord, both untreated and neoprene treated. It assists users by designating typical industry products and establishes standards for construction, testing, and classification.
📐 Scope and Designation of Construction
The scope covers continuous glass filament sewing thread and cord, untreated or neoprene treated. Construction designations follow Specification D578/D578M, with added letters “U” (untreated) or “N” (neoprene treated) for cords. Cord designations include a type number (1–10) indicating relative diameter, where a higher number means a larger diameter. Sewing thread construction uses a type number describing a manufacturer’s code and size, with numerals (e.g., 2, 4, 6) indicating relative diameter.
| 🟦 Cord Type Number | 📏 Relative Diameter | 🎯 Treatment Code |
|---|---|---|
| 1 | Smallest | U or N |
| 5 | Medium | U or N |
| 10 | Largest | U or N |
⚙️ Construction and Classification
Cords are classified by type number and treatment, with “U” for untreated and “N” for neoprene treated. Sewing threads include a type number with a manufacturer’s code and size numeral. All fiber glass cords and sewing threads must meet specific twist and ignition loss requirements per Test Methods D1423/D1423M and D4963/D4963M.
| 🟦 Sewing Thread Type | 📐 Size Code | ⚡ Typical Diameter |
|---|---|---|
| 2 | Small | 0.2–0.3 mm |
| 6 | Medium | 0.5–0.6 mm |
| 10 | Large | 0.8–0.9 mm |
Technical Note: Values in SI or inch-pound units must be used independently—combining them leads to nonconformance with the standard.
📊 Key Properties and Testing
Relevant test methods include D204 (sewing threads), D1423/D1423M (twist), D1776/D1776M (conditioning), and D4963/D4963M (ignition loss). Conditioning and testing should follow standard practices to ensure accuracy. The specification references ANSI/ASQC Z1.4 for sampling procedures.
Important: Always condition test specimens per D1776/D1776M before testing to avoid variability in results.
❓ Frequently Asked Questions
🔍 What is the difference between “U” and “N” in cord designations?
“U” indicates untreated cord, while “N” indicates neoprene-treated cord, which provides enhanced durability and resistance.
💡 How are sewing thread type numbers structured?
They include a manufacturer’s code and a size numeral (e.g., 2, 4, 6) that indicate increasing relative diameter.
⚡ What test methods are referenced for quality control?
Key methods include D204 for sewing threads, D1423/D1423M for twist, and D4963/D4963M for ignition loss.
📌 What are the intended uses of this specification?
It assists users in identifying typical glass fiber cord and sewing thread products for industrial applications.