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D3106-07 – Standard Test Method Technical Guide
The ASTM D3106-07 (Reapproved 2018) standard defines a definitive test method for evaluating the permanent deformation or non-recoverable stretch of elastomeric yarns subjected to prolonged periods of tension. The method is critical for quality control of bare, continuous elastomeric filaments used in various textile applications.
📐 Scope and Applicable Material Types
This test method is specifically designed to assess the permanent deformation of bare, continuous elastomeric monofilaments and filament yarns. It covers a wide range of elastomeric materials including rubber, spandex, anidex, and similar polymers. The standard applies to yarns with a linear density falling within the range of 4 to 320 tex (36 to 2900 denier).
It is crucial to note that this test method is not applicable to covered, wrapped, core-spun yarns, or yarns spun from elastomeric staple fibers. The test is typically conducted on yarns in an as-received condition, though it may be adapted for treated yarns provided the treatment is fully specified and documented.
| 🟦 Parameter | 📐 Specification from D3106 |
|---|---|
| Yarn Types | Bare, Continuous Monofilaments and Filament Yarns |
| Material Types | Rubber, Spandex, Anidex, or other elastomers |
| Linear Density Range | 4 to 320 tex (36 to 2900 den.) |
| Excluded Constructions | Covered, Wrapped, Core-spun, or Elastomeric Staple Yarns |
⚙️ Test Procedure and Conditions
The test begins by establishing the nominal linear density of the sample. The elongation at the breaking force is then determined from representative specimens. A specific specimen is securely mounted in a pair of line-contact clamps.
The specimen is held at a pre-selected elongation for a specified period of time. Following this induced tension phase, the yarn is allowed to recover. The core measurement of the test is the permanent deformation, defined as the non-recoverable stretch measured after the specified recovery period.
💡 Technical Note: For acceptance testing of commercial shipments, laboratories must establish a prior agreement on the exact elongation value to be used during the test. This ensures consistency and allows the acceptable between-laboratory precision estimates to be fully utilized (Section 5.1).
⚠️ Important Safety Note: As stated in Section 1.5, users must establish appropriate safety, health, and environmental practices. It is the responsibility of the user to determine the applicability of regulatory limitations prior to conducting any testing.
📊 Key Measured Properties and Precision
The standard references Terminology D4849 for key terms relevant to this method, including breaking force, elongation, extension, linear density, and permanent deformation. For all other textile-related terminology, Terminology D123 applies. The significance of this test lies in its ability to quantify the stretch recovery properties of elastomeric yarns under prolonged stress.
Current estimates of between-laboratory precision are considered acceptable for acceptance testing. If statistical bias is suspected between two laboratories, Section 5.1.1 mandates a comparative test using unpaired data at a probability level chosen prior to the testing series.
| 🎯 Term | ⚡ Definition / Reference |
|---|---|
| Permanent Deformation | Non-recoverable stretch measured after a specified recovery period (Section 4.2) |
| Elongation at Breaking Force | Determined from representative specimens prior to testing |
| Standard Test Condition | As-received (treated condition only if explicitly specified) |
| Clamping Mechanism | Pair of line-contact clamps |
❓ Frequently Asked Questions
🔍 What specific types of yarn are excluded from this test method?
According to Section 1.2, this test method is not applicable to covered, wrapped, core-spun yarns, or yarns spun from elastomeric staple fibers. It is strictly for bare, continuous elastomeric monofilaments and filament yarns.
⚡ What is the summary of the permanent deformation test procedure?
As summarized in Section 4, a specimen is placed in a pair of line-contact clamps, held at a selected elongation for a specified period, and the permanent deformation (non-recoverable stretch) is measured after a specified recovery period.
💡 How should differences in test results between two laboratories be addressed?
Section 5.1.1 specifies that comparative tests should be performed to determine if a statistical bias exists, using unpaired data and competent statistical assistance. If a bias is found, the cause must be corrected or the results must be adjusted.
📌 What is the designated linear density range specified in the scope?
The standard is applicable to elastomeric yarns having a linear density in the range from 4 to 320 tex (36 to 2900 denier), as defined in Section 1.1.