Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D5683 – Standard Test Method Technical Guide
📐 Test Apparatus and Specimen Requirements
The test requires a water bath with a minimum capacity of 10 L (2.5 gal) maintaining a temperature of 4.4 ± 0.1 °C (40 ± 0.2 °F). Polyethylene bags are used for conditioning each group of test specimens. The test block, made from a hard, durable material, features arcs with specific radii as detailed below.
| 🟦 Arc Radius | 📏 SI Units (mm) | 📐 Inch-Pound Units (in.) |
|---|---|---|
| R1 | 6 | 1/4 |
| R2 | 13 | 1/2 |
| R3 | 19 | 3/4 |
| R4 | 25 | 1 |
All arcs are designed to provide equal arc lengths for consistent testing.
⚙️ Test Procedure and Conditioning
Five specimens of roofing or waterproofing sheet material are conditioned in polyethylene bags at 4.4 °C (40 °F) and bent over the test block. The smallest radius at which no cracking occurs in any specimen is reported. Other temperatures may be used, and refrigerated chambers can replace the water bath.
| 🎯 Parameter | ⚡ Specification |
|---|---|
| Condition Temperature | 4.4 °C (40 °F) |
| Temperature Tolerance | ±0.1 °C (±0.2 °F) |
| Number of Specimens | 5 |
| Conditioning Method | Water bath or refrigerated chamber |
| Reporting Criteria | Smallest radius without cracking |
💡 Other test temperatures may be used in addition to the standard 4.4 °C. If using a refrigerated conditioning chamber, follow Section 8 procedures; the plastic bag may be omitted.
📊 Key Measured Properties and Significance
The primary property measured is flexibility, quantified by the smallest arc radius without cracking. This test aids in understanding material properties but does not predict service life. Flexibility changes are linked to performance, though the exact relationship may vary.
⚠️ The values in SI and inch-pound units are not exact equivalents. Use each system independently to avoid nonconformance.
❓ Frequently Asked Questions
🔍 What is the standard test temperature? The standard test temperature is 4.4 °C (40 °F), with a tolerance of ±0.1 °C (±0.2 °F).
💡 How many specimens are required? Five specimens are required for the test.
⚡ What are the specified radii for the test block? The radii are 6 mm (1/4 in.), 13 mm (1/2 in.), 19 mm (3/4 in.), and 25 mm (1 in.).
📌 Can other test temperatures be used? Yes, other temperatures may be used in addition to 4.4 °C, and refrigerated chambers can be employed following Section 8.