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D6100-17 – Standard Test Method Technical Guide
ASTM D6100-17 is the governing standard for polyoxymethylene (POM) shapes, commonly known as acetal or Delrin®, fabricated through extrusion, compression molding, and injection molding processes. This specification ensures consistent material quality, dimensional accuracy, and mechanical integrity for sheet, plate, rod, and tubular bar shapes used in demanding engineering applications.
📐 Scope and Classification System
ASTM D6100-17 specifies requirements for POM shapes excluding pipe and fittings. It provides a classification system in Section 4 that enables users to define specific performance characteristics for specialized applications. The standard officially adopts inch-pound units as the standard measurement, with SI unit equivalents provided for reference in Table S-POM and Table 1. This version also explicitly allows for the use of recycled plastics, supporting sustainability in manufacturing, in accordance with Guide D7209.
⚠️ Unit System Note: All property and dimensional tables in the standard mandate inch-pound values as the standard. When referencing Table S-POM or Table 1, ensure SI conversions are evaluated carefully for critical tolerances.
⚙️ Testing Protocols and Property Verification
Mechanical and physical properties of POM shapes must be verified using standardized ASTM methods. D618 conditioning (typically 23 ± 2°C and 50 ± 5% relative humidity for a minimum of 40 hours) is required before testing. The following test methods are directly referenced by the specification:
| 🟦 Property | 📐 Test Method | 🎯 Application |
|---|---|---|
| Tensile Strength & Elongation | ASTM D638 | Determines material strength under uniaxial load |
| Flexural Strength & Modulus | ASTM D790 | Evaluates stiffness and resistance to bending |
| Izod Impact Resistance | ASTM D256 | Measures toughness and impact strength |
💡 Pro Tip: For detailed material callouts (e.g., tensile strength minimums, flexural modulus grades), fabricators should cross-reference ASTM D6100 with the cell-type classification system found in ASTM D6778 for Polyoxymethylene Molding and Extrusion Materials.
📊 Dimensional Tolerances and Workmanship
Consistent manufacturing quality is a pillar of this specification. D6100-17 requires that all extruded, compression molded, and injection molded shapes meet strict workmanship criteria. They must be free of internal voids, surface cracks, foreign inclusions, and other defects that could impair service life. The standard references Practice D3892 for packaging and packing requirements of plastic parts. Furthermore, definitions for processing terms like “regrind” (reclaimed sprues, runners, and edge trim) are provided in Terminology D883 and Guide D7209, standardizing communication throughout the supply chain.
| 🟦 Requirement | 📐 Reference | ⚡ Description |
|---|---|---|
| Conditioning | ASTM D618 | Standard practice for uniform, reproducible test results |
| Packaging / Packing | ASTM D3892 | Ensures material integrity during handling and shipping |
| Recycled Material | Section 1.3 / D7209 | Permits use of post-industrial or post-consumer resin |
| Regrind Definition | Section 3.1.1 | In-house reclaimed scrap (sprues, trim) for remanufacturing |
❓ Frequently Asked Questions
🔍 What shapes and processes does ASTM D6100-17 cover?
The standard specifically covers extruded, compression molded, and injection molded POM sheet, plate, rod, and tubular bar shapes. It explicitly excludes pipe and fittings.
💡 Does ASTM D6100-17 permit the use of recycled plastics?
Yes. Section 1.3 of the specification explicitly allows for the use of recycled plastics, provided the final material meets the requirements laid out in the classification system and performance tables.
⚡ What is the standard conditioning procedure prior to testing?
Standard conditioning must follow ASTM D618, which involves exposure to a controlled atmosphere of 23 ± 2°C (73.4 ± 3.6°F) and 50 ± 5% relative humidity for a minimum of 40 hours before testing.
📌 How does this standard classify different grades of POM?
Section 4 of D6100-17 provides a classification system for defining requirements specific to specialized applications. This is used in conjunction with the material classification system in ASTM D6778 for precise property callouts.
By adhering to ASTM D6100-17, manufacturers and end-users ensure consistent quality in POM shapes, facilitating reliable performance in high-precision industrial components such as gears, bearings, and electrical insulators.