ASTM D6762 Determining the Hiding Power of Paint by Evaluation of Spray Coatings
ASTM D6762 test method determines the properties of spray coatings by quantitatively detecting the film thickness required for full hiding. The thickness of the film determines the hiding power of the test paint. This method is only applicable to spray-applied coatings, but the concepts can be applied to other application methods as well.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM D6762 is a standard test method for visually assessing the hiding power of spray-applied coatings. This test method determines the film thickness required for a paint or coating to conceal a contrasting background pattern.
By evaluating hiding power, this test can predict the coating’s performance, efficiency, durability, and cost-effectiveness. The outcome of this test will provide a clear indication of the coating’s quality and coverage.
Scope, Applications, and Benefits
Scope
ASTM D6762 evaluates:
- Visual hiding capability of spray coatings
- Film thickness required for full opacity
- Performance consistency of coating systems
- Application reliability and efficiency
The method applies to liquid spray-applied paints and coatings used across various industries.
Applications
- Automotive paint systems
- Industrial protective coatings
- Architectural coatings
- Aerospace finishes
- Appliance coatings
- Quality control testing
- Coating product development
- Research and development laboratories
Benefits
- Provides standardized hiding power evaluation
- Supports coating selection
- Improves application efficiency
- Reduces material waste and cost
- Enhances product quality
- Enables comparison of coating formulations
- Ensures performance consistency
Test Process
Panel Preparation & Spray Application
Patterned panels are prepared, and paint is applied in a wedge-shaped film.
1Drying
The coating film is allowed to dry under standard conditions.
2Visual Inspection & Hiding Point Detection
The film is examined to identify the point where the background is entirely hidden.
3Thickness Measurement
Coating thickness is measured at the hiding point.
4Technical Specifications
| Parameter | Details |
|---|---|
| Applicable Materials | Spray-applied paints and coatings |
| Specimen Length | Approx. 12 inches |
| Pattern Types | Black/white, black/gray, red/gray |
| Output Units | Micrometers (µm) |
| Measured Outputs | Film thickness at the hiding point |
Instrumentation Used for Testing
- Spray application system
- Patterned contrast panels
- Dry film thickness gauge
- Controlled lighting setup
- Measuring scale
- Data recording tools
Results and Deliverables
- Film thickness values at the hiding point
- Hiding the power evaluation report
- Comparative coating performance data
- Application efficiency assessment
Frequently Asked Questions
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