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D2198-02 – Standard Test Method Technical Guide
ASTM D2198-02 defines a standardized procedure for evaluating the ease of removing surface stains—specifically those from pencils, crayons, and grease—from multicolor lacquer films. The test method involves applying these stains to coated primed steel panels using a mechanical apparatus and subjecting them to a controlled washing process. This standard serves as a crucial tool for manufacturers and quality control laboratories assessing the cleanability and durability of decorative and protective lacquer coatings.
🧪 Scope and Significance
The test method is specifically designed for multicolor lacquer films applied to cold-rolled steel panels primed with a rust-inhibiting lacquer primer conforming to MIL-P-11414A. The procedure helps simulate real-world staining incidents from common household and industrial materials. According to Section 4 of the standard, the primary purpose is to aid in evaluating the ease of removal for surface stains encountered by coated surfaces.
⚠️ Critical Note on Reproducibility: As stated in Note 1 of the standard, due to the nature of the test, comparable results can only be obtained when exactly the same materials and apparatus are used. It is difficult to adequately describe the test materials in more than general terms, making strict adherence to the specified specifications (such as A 109 or A 366/A 366M for panels) essential for valid comparative testing.
⚙️ Test Procedure and Speed Selection
The test utilizes a washability machine that moves an abrasion boat linearly with a reciprocating motion. The travel distance is strictly 10 inches (254 mm) at a speed of 37 ± 1 cycles (double strokes) per minute.
Three 165 mm × 430 mm primed steel panels are sprayed with the target multicolor lacquer and allowed to dry for 24 hours. Following this, a clear waterproof varnish conforming to Fed. Spec. TT-V-121C is applied to the ends of the panels to define the test area and allowed to dry for 72 hours. The three standard stains—drafting pencil, china marking crayon, and a specific grease formulation—are applied using the specified mechanical carriage and a 40 mm mohair roller before the washing cycle begins.
📏 Panel Specifications and Required Materials
| 🟦 Component | 📐 Specification / Dimension | 🎯 Material / Standard Reference |
|---|---|---|
| Test Panel | 165 × 430 mm (6.5 × 17 in.) | 20-gage cold-rolled steel (A 109 / A 366M) |
| Primer Coating | N/A | MIL-P-11414A (Rust Inhibiting, Lacquer) |
| Washability Machine Travel | 254 mm (10 in.) | 37 ± 1 cycles/min |
| Grease Applicator | 40 mm (1.5 in.) width | Mohair Roller |
| Grease Holding Plate | 100 × 175 mm (4 × 7 in.) | Glass Plate |
| ⚡ Stain Type | 📌 Application Tool | ⚙️ Relevant Standard / Spec |
|---|---|---|
| Drafting Pencil | Mechanical Carriage | Standard drafting pencil |
| China Marking Crayon | Mechanical Carriage | Standard china marking crayon |
| Grease | 40 mm Mohair Roller | Petrolatum (VV-P-236) / Lubricating Oil (VV-O-551) blend |
| Edge Protection Varnish | Brush | Fed. Spec. TT-V-121C (Waterproof Spar Varnish) |
💡 Key Insight: The extensive list of referenced Federal and Military specifications in Section 2 of the standard (such as Fed. Spec. VV-P-236 for Petrolatum and MIL-P-11414A for Primer) highlights the highly specific nature of the materials required to achieve the standardized stain characteristics and substrate performance, which is critical for inter-laboratory correlation.
❓ Frequently Asked Questions
🔍 What is the primary purpose of ASTM D2198-02?
The test method is intended to evaluate the ease of removing common surface stains, such as pencil, crayon, and grease, from multicolor lacquer films applied to primed steel panels.
💡 What are the exact dimensions of the test panels required?
The standard specifies steel panels measuring 165 by 430 mm (6.5 by 17 in.), made from 20-gage cold-rolled steel conforming to ASTM A 109 or A 366/A 366M.
⚡ What is the required speed and travel of the washability machine?
The washability machine must operate at a speed of 37 ± 1 cycles per minute over a precise travel distance of 10 inches (254 mm).
📌 What is the drying time required for the varnish applied to the panel ends before testing can begin?
After applying the multicolor lacquer (dried 24 h), the ends of the panels are coated with a clear waterproof varnish and must be allowed to dry for 72 h before the stain removal test is conducted.