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D1793-23 – Standard Test Method Technical Guide
📐 Scope and Significance
ASTM D1793 −23 specifies a standard test method for determining the water spotting resistance of water emulsion floor polishes. The procedure is designed to approximate typical service conditions where water comes into contact with the polished surface. Water spotting is specifically defined in Section 3.1.1 as any change in appearance of surface resulting solely from the action of cool water.
💡 Tip: Section 4.1 strongly advises using reference polishes for comparison to benchmark the water spotting resistance of test samples against known standards.
| 🟦 Category | 📏 Specification |
|---|---|
| Substrate | Official Vinyl Composition Tile (OVCT) |
| Test Liquid | Distilled Water |
| Dispensing Tool | Volumetric Pipet, 1 mL |
| Application Method | Method C (Manual Dip) of D1436 |
⚙️ Test Procedure and Standard Conditions
The test panel is prepared by applying two coats of the emulsion floor polish to a black OVCT panel. The panel is dried in a near-vertical position under strictly controlled environmental conditions (50 ± 4 % relative humidity and 23.9 ± 1.1 °C). The dynamic test procedure involves placing the panel horizontally, applying 1 mL of distilled water near the center, and allowing it to stand undisturbed for one hour. The water is then carefully removed using a damp cloth followed by a light dry rub.
⚠️ Important Note on Curing: As stated in Note 2 of the standard, the drying time can be extended beyond 24 hours. Some floor polishes do not achieve their full water spotting resistance until 48 hours after application. A test conducted at 24 hours may be a worst-case scenario for certain formulations.
| 🎯 Procedure Step | ⚡ Action | 📐 Conditions |
|---|---|---|
| 1st Coat Application | Dip panel | Near vertical for 10 min, wipe bead |
| 1st Coat Drying | Air dry vertically | 2 h at 23.9 °C / 50 % RH |
| 2nd Coat Application | Dip panel (reverse orientation) | Near vertical for 10 min, wipe bead |
| 2nd Coat Drying | Air dry vertically | 24 h at 23.9 °C / 50 % RH |
| Water Application | Pipet 1 mL distilled water | Panel level, water undisturbed for 1 h |
📊 Evaluation of Water Spotting Damage
The evaluation focuses on visual changes in the film where the water was in contact. The standard highlights that this can include slight whitening, color change, or a noticeable change in appearance, potentially extending to the complete removal of the polish film. Because the standard provides a comparative method rather than an absolute pass/fail metric, the use of reference polishes is essential for generating objective, reproducible results. The test is typically considered a “Dynamic Test” as it measures the response to a large volume of water that is eventually wiped away.
✅ Test Variations: ASTM D1793-23 accommodates two distinct scenarios. The primary method is the Dynamic Test (large water volume, wiped). The standard also alludes to an alternative method designed to measure damage caused by a small volume of water that evaporates to dryness, representing a different mode of exposure.
❓ Frequently Asked Questions
🔍 What substrate is mandated by the standard?
Section 5.1 requires the use of Official Vinyl Composition Tile (OVCT) as the substrate for preparing the test panel.
💡 Why is the drying time of 24 hours suggested but not strictly fixed?
Note 2 explains that water spotting resistance can develop over time. Some polishes naturally require 24 to 48 hours of curing to reach their final resistance properties. Varying the drying time allows the test to capture this performance characteristic.
⚡ Is the 1 mL water test the only method described?
No. While the “Dynamic Test” using 1 mL of water is the primary procedure described in Section 7.1, Section 4.1 references a separate method to measure the amount of damage by a small amount of water that has evaporated to dryness.
📌 What are the standard environmental conditions for testing?
Section 6.1 specifies standard conditions of 50 ± 4 % relative humidity and 23.9 ± 1.1 °C (75 ± 2 °F) for drying and testing.