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D5747 – Standard Test Method Technical Guide
ASTM D5747/D5747M-21, developed under the jurisdiction of ASTM Committee D35 on Geosynthetics and its Subcommittee D35.02 on Endurance Properties, defines a standardized practice for evaluating the chemical resistance of geomembranes upon exposure to liquids. This practice is essential for determining material suitability in containment applications such as landfills, mining operations, and industrial liquid storage, where long-term durability against chemical attack is critical.
⚠️ User Responsibility: Section 1.6 states that this standard does not purport to address all safety concerns. It is the responsibility of the user to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are provided in Section 7 of the full standard.
📐 Scope and Applicable Materials
The standard applies to a diverse range of geomembrane types, including semi-crystalline, amorphous, elastomeric, and fabric-reinforced variants, as outlined in Section 1.2. The scope is specifically limited to establishing uniform testing and reporting procedures for samples in their unexposed and exposed states. Furthermore, Section 1.4 explicitly states that the evaluation and interpretation of the resulting test data are beyond the scope of this practice, placing the responsibility for establishing pass/fail criteria on the specifier. The exposure liquids covered encompass prepared chemical solutions, liquid wastes, and leachates derived from solid wastes.
| 🟦 Exposure Liquid Category | 📐 Typical Application / Source |
|---|---|
| Prepared Chemical Solutions | Specific chemical mixtures prepared according to Practice D5322 |
| Liquid Wastes | Site-specific industrial or municipal waste streams |
| Solid Waste Leachates | Derived from solid waste in laboratory or field settings |
⚙️ Standard Test Procedures
A critical requirement of D5747 is its coupling with Practice D5322 (Laboratory Immersion) or Practice D5496 (Field Immersion) as stated in Section 1.3. These companion standards define the precise methodology for exposing specimens to the liquid medium. Once exposed, the materials are evaluated using a comprehensive suite of referenced ASTM test methods to measure changes in physical, mechanical, and thermal properties.
| 🔍 Property Category | 📏 Standard Test Method | 🎯 Target Materials |
|---|---|---|
| Tensile Properties | D412, D638, D882, D751 | Vulcanized rubber, plastics, thin sheeting, coated fabrics |
| Tear Resistance | D624, D1004 | Rubber and thermoplastic elastomers, plastic film |
| Hardness (Durometer) | D2240 | Rubber property |
| Adhesion to Substrate | D413 | Rubber to flexible substrate |
| Density | D1505 | Plastics (Density-Gradient Technique) |
| Oxidative Induction Time | D3895 | Polyolefins |
| Thermal Properties (DSC) | D3418, D3417 | Transition temperatures, enthalpies of fusion |
📊 Reporting and Data Requirements
This practice standardizes the reporting of data for both unexposed control and exposed specimens. The standard mandates that changes in mass, dimensions, and physical properties are rigorously documented to allow for informed material selection. A key technical requirement in Section 1.5 stipulates that values stated in either SI units or inch-pound units shall be regarded separately as standard and must not be combined.
⚡ Unit System Compliance: According to Section 1.5, the SI units and inch-pound units are not necessarily exact equivalents. To ensure full conformance with D5747/D5747M, each system must be used independently of the other, and values from the two systems must not be combined.
❓ Frequently Asked Questions
🔍 What is the main purpose of ASTM D5747/D5747M-21?
To establish uniform testing and reporting procedures for evaluating the chemical resistance of geomembranes to various liquids, including chemical solutions, liquid wastes, and solid waste leachates.
💡 Which immersion practices must be used in conjunction with D5747?
Section 1.3 mandates that this practice is intended to be used with Practice D5322 (for laboratory immersion) or Practice D5496 (for on-site or field immersion) to define the exact exposure procedures.
⚡ Can I use D5747 to determine if a geomembrane passes or fails a chemical resistance test?
No. Section 1.4 explicitly states that the evaluation and interpretation of test data are beyond the scope of this practice. The user must establish their own performance criteria based on project requirements.
📌 What types of materials are covered by this practice?
As detailed in Section 1.2, this practice covers procedures for testing semi-crystalline, amorphous, elastomeric, and fabric-reinforced geomembranes.