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D1913-00 – Standard Test Method Technical Guide
📋 Scope and Significance
This test method, designated D1913−00 (Reapproved 2023), provides a qualitative evaluation of the surface repellency to water of garment-type leathers. It is not applicable to wet blue. The values stated in inch-pound units are standard. This method measures surface-water resistance only and is not intended for determining resistance to water penetration. A visual means based on a standard chart is used for evaluation. This international standard was developed in accordance with WTO TBT principles.
🔬 Test Apparatus
The spray tester includes a standard spray nozzle with 19 holes (drill No. 65, 0.035 in. or 0.89 mm in diameter), connected via 3/8 in. (9.5 mm) rubber tubing to a 6 in. (152 mm) laboratory funnel. The assembly is held on a ring support over a 6 in. (152 mm) metal embroidery hoop mounted on a wooden block at a 45° angle, with the nozzle center 6.0 in. (152 mm) from the specimen center.
| 🟦 Component | 📏 Specification |
|---|---|
| Nozzle | 19 holes, drill No. 65, 0.035 in. (0.89 mm) diameter |
| Funnel | 6 in. (152 mm) laboratory funnel |
| Tubing | 3/8 in. (9.5 mm) rubber tubing |
| Hoop | 6 in. (152 mm) metal embroidery hoop |
| Nozzle to specimen distance | 6.0 in. (152 mm) |
| Specimen angle | 45° from horizontal |
⚙️ Test Procedure and Conditions
The test specimen shall be at least 7 in. by 7 in. (178 mm by 178 mm); for nondestructive testing, the entire skin may be used. Secure the specimen in the hoop without wrinkles, with the surface to be evaluated facing upward and centered under the nozzle. Pour 250 mL of water at 80°F ± 2°F (27°C ± 1°C) into the funnel, which will spray for 25 to 30 seconds. After spraying, remove the hoop, tap it smartly once against a solid object, rotate it 180°, and tap once more. Compare the wetted pattern with the standard rating chart.
| Parameter | 📐 Value |
|---|---|
| Water volume | 250 mL |
| Water temperature | 80°F ± 2°F (27°C ± 1°C) |
| Spray time | 25–30 seconds |
| Specimen size | 7 in. × 7 in. (178 mm × 178 mm) |
| Conditioning | Not required |
⚠️ Ensure the water temperature is strictly maintained at 80°F ± 2°F (27°C ± 1°C). Deviation can affect the wetting pattern and reproducibility.
💡 This test provides a qualitative measure of surface repellency only. It does not indicate water penetration resistance, and results may not correlate directly with performance in use.
❓ Frequently Asked Questions
🔍 What is the purpose of the spray test?
It evaluates the surface-water repellency of garment-type leathers by spraying water and comparing the wetting pattern with a standard chart.
💡 Is specimen conditioning required before testing?
No, conditioning is not necessary per the standard procedure.
⚡ What are the key testing conditions?
250 mL of water at 80°F ± 2°F (27°C ± 1°C) is sprayed over 25–30 seconds onto a specimen held at 45°.
📌 What is the minimum specimen size?
The specimen must be at least 7 in. by 7 in. (178 mm by 178 mm).