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D5935-96 – Standard Test Method Technical Guide
ASTM D5935 – 96 defines a standardized framework for generating and presenting comparable single-point property data for plastic materials. Technically equivalent to ISO 10350, this practice consolidates the specific test conditions from various material standards into a single, coherent specification for manufacturer data sheets.
📐 Scope and Equivalence of ASTM D5935-96
The core objective of D5935 is to ensure that basic property data reported for plastics is truly comparable across different suppliers and formulations. It specifically targets properties conventionally presented in manufacturers’ data sheets. The practice states a clear scope: it applies predominantly to materials that are injection-moulded, compression-moulded, or prepared as sheets of specified thickness. A critical feature of the standard is its explicit statement of equivalence: This practice is identical to ISO 10350. This means compliance with D5935 automatically meets the international requirements for single-point data acquisition.
⚙️ Test Methods and Specimen Preparation
To achieve data comparability, D5935 does not introduce new test methods but rather specifies which existing methods must be used and under what conditions. The practice heavily relies on a suite of ASTM standards, each paired with an ISO counterpart for international harmonization. Specimen preparation is strictly governed to eliminate variability from the manufacturing process, referencing specific moulding practices.
| 🔬 Test Category | 📏 ASTM Standard | 📐 ISO Equivalent | 🎯 Property Measured |
|---|---|---|---|
| Specimen Moulding | D5939 / D5940 | ISO 294 | Multipurpose & Small Plate Specimens |
| Tensile Properties | D5937 | ISO 527-1/2 | Modulus, Yield Strength, Elongation |
| Charpy Impact | D5942 | ISO 179 | Impact Strength (Notched/Unnotched) |
| Flexural Properties | D5943 | ISO 178 | Flexural Modulus |
| HDT / Vicat | D5944 / D5945 | ISO 75-2 / ISO 306 | Deflection Temperature / Softening Point |
⚠️ Critical Comparability Condition: The single-point data defined in D5935 is only valid when the specimen preparation strictly follows the listed standards (e.g., D5939 for injection moulding) and conditioning is performed per ISO 291 (23°C, 50% RH). Any deviation in specimen geometry or preparation technique invalidates the comparability of the generated data.
📊 Structuring Single-Point Data for Data Sheets
Within the framework of D5935, a “single-point” value typically refers to a measurement taken under a single, specified set of conditions. However, the practice acknowledges that for some properties, a single value is insufficient; therefore, “two-point” data is specified (e.g., tensile modulus at 1 mm/min and yield behavior at 50 mm/min). The following table outlines the core properties and their standardized testing regimes referenced by the practice.
| 🟦 Property Domain | 📊 Measured Parameter | ⚡ Specified Conditions | 📐 Reference Standard |
|---|---|---|---|
| Rheological | Melt Mass-Flow Rate (MFR) | Specific Temp & Load (e.g., 190°C/2.16 kg) | ISO 1133 |
| Physical | Density / Relative Density | Immersion Method | ISO 1183 |
| Thermal | Temperature of Deflection (HDT) | Method B (1.8 MPa) or A (0.45 MPa) | ISO 75-2 |
| Flammability | Burning Behaviour | Horizontal / Vertical Small Flame | ISO 1210 |
| Hygroscopic | Water Absorption | 24h Immersion at 23°C | ISO 62 |
💡 Harmonization Note: Because D5935 is technically identical to ISO 10350, a data sheet generated using this ASTM practice is fully compliant with the international standard. This creates a powerful tool for global material selection, eliminating confusion caused by different testing speeds or specimen geometries historically used in different regions.
❓ Frequently Asked Questions
🔍 What is the primary purpose of ASTM D5935-96?
The primary purpose is to standardize the way basic single-point properties of plastics are tested and reported. By specifying exact test methods (drawn from D5937, D5942, etc.) and conditions, it ensures that data from different manufacturers’ data sheets are truly comparable, enabling rational material selection.
💡 How does ASTM D5935 relate to ISO 10350?
According to the scope (Section 1.2), this practice is identical to ISO 10350. This technical equivalence means that a manufacturer meeting the ASTM requirements is simultaneously meeting the ISO requirements for single-point data acquisition and presentation.
⚡ Does D5935 apply to all plastic materials?
The scope specifies that it applies predominantly to plastics that may be injection-moulded or compression-moulded, or prepared as sheets of specified thickness. This covers the vast majority of thermoplastic and thermosetting molding compounds.
📌 What is the difference between “single-point” and “multi-point” data?
D5935 specifically covers “single-point” data, which is a property value measured under a single standardized condition. In contrast, multi-point data explores property behavior over a range of conditions (e.g., creep over time). While D5935 focuses on the former for data sheets, it relies on the precision of