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D2064-24 – Standard Test Method Technical Guide
📐 Introduction and Significance
This test method, ASTM D2064-24, evaluates the print resistance of architectural paints. Print resistance is the ability of a paint film to resist permanent impression from pressure contact, which is essential for maintaining appearance in interior spaces. This accelerated procedure simulates on-site conditions where objects may create indentations.
⚙️ Test Procedure and Equipment
The test requires applying the paint to 75 mm by 150 mm glass slides using a 150 µm drawdown applicator. After drying, a medium weave cheesecloth is placed on the film. A No. 8 rubber stopper (40 mm top, 32 mm bottom diameter) is positioned with the smaller end on the cheesecloth, topped with a 500 g weight. This creates a pressure of about 6.2 kPa (0.9 psi). The setup is placed in an oven at 60°C ± 2°C for 1 hour. After cooling, the surface is rated on a scale of 0 to 10 for the impression left by the cheesecloth.
Apparatus includes a conditioning room (18.0°C to 29.5°C, 40% to 60% RH), glass slides, drawdown applicator, oven, No. 8 rubber stoppers, cheesecloth, scissors, and a 500 g weight.
📊 Key Measured Properties
The primary property is print resistance, quantified by the rating scale. The scale goes from 0 (no impression) to 10 (severe printing). This rating helps in comparing the performance of different paint formulations.
| ⚙️ Parameter | 📏 Specification |
|---|---|
| Oven Temperature | 60°C ± 2°C (140°F ± 3.5°F) |
| Test Weight | 500 g |
| Rubber Stopper Size | No. 8 (40 mm top, 32 mm bottom) |
| Pressure Applied | Approximately 6.2 kPa (0.9 psi) |
| Test Duration | 1 hour |
| Conditioning Temperature | 18.0°C to 29.5°C (65°F to 85°F) |
| Conditioning Humidity | 40% to 60% RH |
| Rating Scale | 0 to 10 (0 = no impression, 10 = severe) |
Note: This test method differs from blocking resistance (D4946). Printing involves surface indentation from pressure, not adhesion between surfaces.
The test is designed for decorative coatings under random pressure contact, making it suitable for quality control in paint manufacturing.
❓ Frequently Asked Questions
🔍 What is print resistance?
Print resistance is the ability of a paint film to resist forming a permanent impression from pressure contact, as defined in this standard.
💡 How is the test performed?
A cheesecloth, stopper, and weight are placed on the paint film, then the assembly is heated at 60°C for 1 hour. After cooling, the surface is rated for any impression.
⚡ What is the rating scale?
The scale from 0 to 10 subjectively measures the impression severity, with 0 indicating no impression and 10 indicating a deep, permanent indent.
📌 What conditions are used?
Standard conditions are 60°C oven, 500 g weight, and 1 hour duration. Conditioning is at 18°C-29.5°C with 40%-60% humidity.