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D1562-22 – Standard Test Method Technical Guide
📋 Material Composition and Limits
ASTM D1562-22 specifies requirements for cellulose acetate propionate (CAP) compounds used in injection molding and extrusion. The material must contain less than 48% propionyl and less than 3% acetyl. Dyes and pigments are permitted. The standard supports the use of recycled cellulosic materials provided all requirements are met. This classification system is designed to facilitate material call-outs in part specifications, not for material selection.
⚙️ Test Methods and Conditioning
All testing must be performed on specimens conditioned according to ASTM D618. The standard references multiple ASTM methods to characterize CAP properties. These include tensile testing (D638), flexural testing (D790), density measurement (D792), water absorption (D570), Izod impact (D256), burning rate (D635), and electrical tests (D149 and D257). These tests ensure consistent quality and performance.
| 🟦 Test Method | 📐 Property | 🎯 Application |
|---|---|---|
| D149 | Dielectric Strength | Electrical insulation |
| D256 | Izod Impact | Toughness |
| D570 | Water Absorption | Moisture resistance |
| D635 | Burning Rate | Flammability |
| D638 | Tensile Properties | Strength and elongation |
| D790 | Flexural Properties | Stiffness |
| D792 | Density | Specific gravity |
📊 Key Measured Properties
The property requirements help define material grades. Density indicates material consistency, water absorption affects dimensional stability, and mechanical properties like tensile strength and flexural modulus define structural capability. Izod impact resistance measures durability, and burning rate classifies fire behavior. Electrical properties are critical for insulating components. Suffixes can specify additional requirements for specialized applications as per Section 5 of the standard.
⚠️ Note: The standard does not cover material selection. Users must evaluate part design, environment, and fabrication process. Refer to the full standard for detailed requirements.
💡 Tip: Conditioning per D618 is crucial for accurate test results. All specimens should be conditioned at 23°C ± 2°C and 50% ± 5% relative humidity for at least 40 hours before testing.
❓ Frequently Asked Questions
🔍 What are the chemical composition limits for CAP in ASTM D1562-22?
The propionyl content must be less than 48% and acetyl content less than 3%.
💡 Can recycled materials be used under this standard?
Yes, reprocessable and recyclable cellulosic materials are allowed provided they meet all specification requirements.
⚡ Which test method evaluates water absorption?
ASTM D570 is used to determine water absorption of CAP compounds.
📌 Is there an ISO equivalent to ASTM D1562-22?
No known ISO equivalent exists for this standard.