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D4967-21 – Standard Test Method Technical Guide
📐 Scope and Purpose of the Standard
ASTM D4967 – 21, issued under the fixed designation D4967, is a Standard Guide under the jurisdiction of Committee D09 on Electrical and Electronic Insulating Materials. It is specifically designed to provide a comprehensive list of materials commonly used for insulation, jacketing, and strength components in fiber-optic cables. The guide acts as a roadmap for engineers and specifiers, directing users to appropriate ASTM material standards where they exist. The standard explicitly acknowledges the dynamic nature of material technology, noting that due to changing technology, not all materials being used are necessarily listed in the current edition.
⚠️ Exclusions from Scope: Section 1.2 of the standard clearly states that this guide does not include materials used for optical purposes (the optical fiber and its coating) or external metallic armoring (such as barriers for rodents). These components are governed by distinct specification requirements.
⚙️ Material Classification and Referenced Standards
The standard organizes its material data into two structured formats to facilitate efficient selection. First, it provides a functional subdivision of fiber-optic cable construction into components used for insulation, jacketing, or strength, listing generic material classes for specific applications in each component. Second, it presents an alphabetical list of these generic material classifications with cross-references to their governing ASTM standards. The table below summarizes the key generic material classes found in the guide alongside their specific ASTM standard designations.
| 🟦 Generic Material Classification | 📏 Applicable ASTM Standard(s) |
|---|---|
| Polyethylene Plastics (Wire and Cable) | D1248 |
| Polytetrafluoroethylene (PTFE) | D1457 |
| Fluorinated Ethylene Propylene (FEP) Resin | D2116 |
| Nonrigid Vinyl Chloride Polymer (PVC) | D2287 |
| Silicone Rubber (Ozone-Resisting) | D2526 |
| Modified ETFE Fluoropolymer | D3159 |
| Unmodified Poly(Vinylidene Fluoride) (PVDF) | D3222 |
| E-CTFE Fluoroplastic | D3275 |
| Perfluoroalkoxy (PFA) Resin | D3307 |
| High Modulus Organic Yarn | D3317 |
| Biaxially Oriented Polymeric Resin Film | D3664 |
| Polycarbonate (PC) | D3935 |
| Nylon Injection and Extrusion (PA) | D4066 |
| Polypropylene Injection and Extrusion (PP) | D4101 |
| Thermoplastic Elastomer Insulation (TPE) | D4246 |
| Thermoplastic Polyester (TPES) | D4507 |
| Flooding / Filling Compounds | D4730 / D4731 / D4732 |
| Copolymers of Vinylidene Fluoride (VDF) | D5575 |
🔧 Application Note: Several standards referenced in D4967 have historical withdrawn status (e.g., D1457 for PTFE, D3317 for Organic Yarn, D4246 for TPE, D4507 for TPES). Users should always verify the current active revision or replacement standard to ensure compliance with modern material specifications.
❓ Frequently Asked Questions
📌 What is the primary purpose of ASTM D4967?
The guide provides a list of materials commonly used for insulation, jacketing, and strength components in fiber-optic cables, with cross-references to relevant ASTM material standards to aid in specification and selection.
🔍 What components are explicitly excluded from this guide?
Section 1.2 explicitly excludes materials used for optical purposes, including the optical fiber and its primary coating, as well as external metallic armoring (e.g., rodent barriers).
💡 How does the standard structure its material recommendations?
The standard offers two general lists: a functional subdivision of cable components (insulation, jacketing, strength) with generic material classes, and an alphabetical list of those classes referencing specific ASTM standards.
⚡ Which ASTM standard is referenced for Polyvinylidene Fluoride (PVDF) in fiber-optic cable components?
ASTM D3222, the Specification for Unmodified Poly(Vinylidene Fluoride) (PVDF) Molding Extrusion and Coating Materials, is the standard referenced for this material class within the guide.