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D1972-97 – Standard Test Method Technical Guide
📐 Scope and Purpose of D1972-97
ASTM D1972-97 (Reapproved 2005) is a standard practice for the generic marking of plastic products. It establishes a uniform system for identifying the polymer(s) used in fabricated items through standardized abbreviated terms. This system assists in making informed decisions regarding handling, recycling, or disposal of plastic components. The practice is especially pertinent for durable plastic products but does not cover marking processes.
Precise marking details, such as minimum size and location, are subject to agreement between the manufacturer and user, as noted in the standard’s scope.
⚙️ Standardized Terminology and Abbreviation System
The marking system relies on abbreviated terms from ASTM D 1600 and ISO/DIS 1043-1. Key definitions from the standard include:
| 🟦 Term | 📐 Definition |
|---|---|
| Abbreviated Term | An omission of part of a term while designating the same concept, including initialisms and acronyms. |
| Bulk Molding Compound (BMC) | A product of mixed resins and chopped reinforcing fibers with or without fillers, moldable under heat and pressure. |
| Matrix Polymer | The continuous phase in a polymeric blend or alloy. |
| Plastic Products | Articles or stock shapes of plastic materials for useful purposes. |
📊 Reference Documents and Compliance Framework
D1972-97 incorporates several ASTM and ISO standards to ensure consistency in marking practices. The following key standards are referenced:
| 🎯 Standard | ⚡ Description |
|---|---|
| ASTM D 883 | Terminology Relating to Plastics |
| ASTM D 1600 | Terminology for Abbreviated Terms Relating to Plastics |
| ASTM D 3935 | Specification for Polycarbonate (PC) Unfilled and Reinforced Material |
| ASTM D 4000 | Classification System for Specifying Plastic Materials |
| ISO 11469 | Plastics—Generic Identification and Marking of Plastics Products |
| ISO/DIS 1043-1 | Plastics—Symbols and Abbreviated Terms—Part 1: Basic Polymers |
These references support the standard’s goal of providing a globally recognizable marking system for plastic products.
💡 Tip: The marking system is designed for durable components and should not replace packaging labeling requirements. Always comply with applicable legislation.
⚠️ Warning: This practice does not specify marking processes; technical details should be mutually agreed upon by stakeholders.
❓ Frequently Asked Questions
🔍 What products fall under this standard?
Plastic products that are durable components, excluding packaging, which has separate legislative requirements.
💡 How are abbreviated terms selected?
They are derived from established standards like ASTM D 1600 and ISO/DIS 1043-1 to ensure consistency.
⚡ Is marking mandatory under D1972-97?
The standard provides a practice for marking, but its implementation is subject to agreements between manufacturers and users.
📌 What is the significance of this practice?
It aids in the identification of polymers for handling, recycling, or disposal decisions, promoting environmental sustainability.