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D4389 – Standard Test Method Technical Guide
ASTM D4389/D4389M-23 establishes specifications for finished glass fabrics woven from E-glass rovings, intended primarily as reinforcement in laminated plastics for structural use. This standard defines terminology, general requirements, and physical properties to ensure consistent quality in woven roving glass fiber products.
📐 Scope and Terminology
The specification covers glass fabrics woven from “E” electrical continuous glass fiber rovings. It permits sizing materials for weaving facilitation, which must be compatible with the resin matrix if not removed during cleaning. The standard is part of a series replacing earlier military specifications such as MIL-Y-1140H, MIL-C-9084C, and MIL-C-19663C.
| 🟦 Standard | 📏 Description | 🎯 Purpose |
|---|---|---|
| D3775 | End (Warp) and Pick (Filling) Count | Determines fabric construction |
| D3776/D3776M | Mass Per Unit Area (Weight) | Measures fabric weight |
| D4963/D4963M | Ignition Loss of Glass Fiber Strands and Fabrics | Assesses finish content after cleaning |
| D4029/D4029M | Finished Woven Glass Fabrics | Relates to overall fabric specification |
⚙️ Physical Requirements and Testing
All testing must follow conditioning procedures from Practice D1776/D1776M. Key physical properties include fabric length (D3773/D3773M), width (D3774), end and pick count (D3775), and mass per unit area (D3776/D3776M). The standard also references methods for finish content in cleaned and after-finished fabrics, essential for ensuring subsequent resin compatibility.
💡 Units Note: Values in SI or inch-pound units are standard and must be used independently. Combining values from both systems leads to nonconformance with this specification.
💎 Key Measured Properties
Mass per unit area and ignition loss are critical for quality control. The ignition loss test (D4963/D4963M) determines the amount of organic finish removed during cleaning, which directly impacts bonding with resin matrices. These properties ensure the fabric meets contract specifications for structural laminates.
⚠️ Sizing Compatibility: If sizing materials are removed during cleaning, they need not be compatible with the resin matrix. However, when retained, compatibility must be verified per the contracting instrument.
❓ Frequently Asked Questions
🔍 What types of glass fibers are covered in this specification?
This specification primarily covers glass fabrics woven from “E” electrical continuous glass fiber rovings, designed for use in reinforced plastic laminates.
💡 How are units handled in this standard?
Values stated in either SI or inch-pound units are standard. Each system must be used independently; combining values from both systems is not permitted.
⚡ Which military specifications does this standard replace?
It replaces MIL-Y-1140H, MIL-C-9084C, and MIL-C-19663C for yarns, cloth, and woven roving materials.
📌 What is the importance of ignition loss testing?
Ignition loss testing (D4963/D4963M) measures finish content after cleaning, ensuring proper compatibility with resin systems for laminate performance.
For complete details, refer to the full ASTM D4389/D4389M-23 document.