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D5989-18 – Standard Test Method Technical Guide
ASTM D5989-18 provides a comprehensive specification for extruded and monomer cast shapes made from nylon (PA), covering material, dimensions, workmanship, and properties. It applies to sheet, plate, rod, and tubular bar, excluding pipe and fittings. This standard is intended to ensure quality and consistency for engineering applications.
📐 Material Classification and Test Methods
The specification uses Classification System D6779 for polyamide materials and includes specific test methods for mechanical properties. The key test methods referenced are summarized below:
| 🟦 Test Method | 📐 Property Measured | 🎯 Application |
|---|---|---|
| D256 | Izod Pendulum Impact Resistance | Measures toughness and ductility |
| D638 | Tensile Properties | Determines yield strength and elongation |
| D790 | Flexural Properties | Evaluates flexural modulus and stiffness |
These tests ensure the material meets the required compositions for specialized applications, with properties identified through the classification system in Section 4 of the standard.
⚙️ Dimensional and Workmanship Requirements
The specification defines dimensional criteria for finished products (F) in Tables 1–4, covering plate, rod, and tubular bar dimensions. Workmanship standards ensure quality and consistency, with values stated in English units. The standard also allows for the use of recycled plastics as defined in Guide D7209.
💡 Tip: This specification replaces Federal Standard LP-410A and PS 50. For packaging, refer to Practice D3892 to ensure proper handling and preservation of nylon shapes.
📊 Key Mechanical Properties
Mechanical properties are specified according to the classification system and test methods. The Izod impact test (D256) identifies ductility, tensile tests (D638) give yield strength, and flexural tests (D790) determine modulus for design. These properties are critical for parts fabricated from nylon stock shapes.
⚠️ Note: The standard includes a precautionary caveat that users must establish appropriate safety, health, and environmental practices before use. There is no known ISO equivalent to this standard.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D5989-18? It covers extruded and cast sheet, plate, rod, and tubular bar made from nylon or monomers, excluding pipe and fittings. The standard includes requirements for material, dimensions, workmanship, and properties.
💡 How are mechanical properties tested? Using test methods such as ASTM D256 for Izod impact, D638 for tensile properties, and D790 for flexural properties, ensuring compliance with classification requirements.
⚡ Can recycled plastics be used in these shapes? Yes, as defined in Guide D7209, recycled plastics are permitted, supporting waste reduction and resource recovery without compromising performance.
📌 Is there an ISO equivalent to this standard? No, according to Note 1 of the standard, there is no known ISO equivalent. This specification is unique to ASTM and replaces Federal Standard LP-410A.