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D2091-96 – Standard Test Method Technical Guide
ASTM D2091-96 (Reapproved 2024) is a standard test method for evaluating the print resistance of dried lacquer films. This method simulates pressure conditions during packaging, shipping, and warehousing to assess potential imprinting and appearance changes.
📐 Test Apparatus and Materials
The required apparatus includes test panels, imprinting fabric, and weights. Test panels must be plane surfaces with an area at least 100% greater than the weight base. Suitable panel materials include wood, metal, paper supported on plate glass, plastic, or other agreed surfaces. The planeness, smoothness, and composition are to be agreed upon by the purchaser and seller. Weights are metal cylinders 51 mm in diameter with plane ends, providing a pressure of 3.5 kPa or 7.0 kPa. Two fabric types are specified: 8 oz Army duck Type III or cheesecloth Type I. When using cheesecloth, a nonwoven felt pad at least 1.3 mm thick and weighing 0.24 kg/m² is required, larger than the weight end.
| 🟦 Fabric Type | 📏 Specification | 📐 Accessories |
|---|---|---|
| Army Duck | 8 oz, Type III, Fed. Spec. CCC-C-419(f) | None required |
| Cheesecloth | Type I, Fed. Spec. CCC-C-440(e) | Felt pad (≥1.3 mm, 0.24 kg/m²) |
⚙️ Test Procedure and Conditions
A weight presses a fabric piece against the test surface. After application, the surface is examined for changes in appearance. The test evaluates if the lacquer film is inherently soft or contains residual solvent, which can cause unsatisfactory printing under packaging and storage conditions. Two pressure options are available: 3.5 kPa (0.5 lb/in²) and 7.0 kPa (1 lb/in²). Optional automatic application equipment, as described in Practices D823, may be used for uniform film thickness.
| 🎯 Pressure | ⚡ Equivalent | 📏 Weight Dimensions |
|---|---|---|
| 3.5 kPa | 0.5 lb/in² | 51 mm diameter |
| 7.0 kPa | 1 lb/in² | 51 mm diameter |
💡 Tip: For optimal reproducibility, ensure the fabric is fully in contact and the weight is applied perpendicularly. The optional automatic application equipment from Practices D823 can help achieve consistent results.
⚠️ Caution: Users must establish appropriate safety, health, and environmental practices. The standard (Section 1.3) does not address all safety concerns; determine regulatory limitations before use.
📊 Key Measured Properties and Compliance
The primary measured property is the change in test surface appearance after fabric pressure, indicating the lacquer’s print resistance. This test method is under ASTM Subcommittee D01.52 and is approved by the U.S. Department of Defense. Compliance ensures the lacquer finish meets performance requirements for packaging and storage, reducing risk of deformation from soft films or residual solvent.
❓ Frequently Asked Questions
🔍 What fabrics are allowed for imprinting?
The standard permits 8 oz Army duck Type III or cheesecloth Type I; cheesecloth requires a felt pad.
💡 What pressures can be applied?
Weights provide either 3.5 kPa (0.5 lb/in²) or 7.0 kPa (1 lb/in²).
⚡ Why is this test important?
It evaluates resistance to printing under packaging and storage pressure, crucial for lacquer finish performance.
📌 What must be agreed upon for test panels?
The planeness, smoothness, and composition of test panels are agreed between purchaser and seller.