ASTM D6132 Measurement of Dry Film Thickness using an Ultrasonic Gauge
ASTM D6132 test method includes the use of ultrasonic film thickness gauges to measure the dry film thickness of organic coatings placed over a substrate of dissimilar material precisely and nondestructively. The values stated in inch-pounds are to be regarded as SI units.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM D6132 describes a non-destructive method for measuring the dry film thickness of coatings applied on non-metallic substrates using an ultrasonic gauge. It is especially useful where conventional magnetic or eddy current methods are not applicable.
This method enables accurate thickness measurement without damaging the coating or substrate. It is widely used in quality control, inspection, and maintenance to ensure coatings meet specified thickness requirements for performance, protection, and durability.
Scope, Applications, and Benefits
Scope
This test method determines the thickness of dry coatings on non-metallic substrates using ultrasonic measurement principles. It is suitable for single or multiple coating layers where substrate type limits traditional methods.
Includes:
- Non-destructive thickness measurement
- Applicable to non-metallic substrates
- Measurement of single and multilayer coatings
- Use of ultrasonic pulse reflection technique
- Evaluation of coating uniformity
Applications
- Coatings on plastic, wood, and composite substrates
- Protective and decorative coatings
- Automotive and aerospace components
- Marine coatings on non-metallic surfaces
- Pipeline coatings on composite materials
- Industrial equipment coatings
Benefits
- Non-destructive testing method
- Suitable for non-metallic substrates
- Accurate and repeatable measurements
- Enables multilayer thickness evaluation
- Reduces inspection time and cost
- Supports quality assurance and compliance
Test Process
Surface Preparation
The coated surface is cleaned and prepared to ensure proper probe contact.
1Calibration
The ultrasonic gauge is calibrated using known thickness standards or reference samples.
2Measurement
The probe is placed on the coating surface to measure thickness using ultrasonic pulses.
3Data Recording
Thickness readings are recorded and analyzed for compliance with specifications.
4Technical Specifications
| Parameter | Details |
|---|---|
| Method | Ultrasonic pulse-echo technique |
| Substrate Type | Non-metallic materials |
| Measurement Range | Depends on coating and instrument |
| Output | Thickness in microns or mils |
| Coating Type | Single or multilayer |
| Contact Method | Probe-based measurement |
| Environment | Field or laboratory use |
Instrumentation Used for Testing
- Ultrasonic thickness gauge
- Ultrasonic probe/transducer
- Calibration standards or reference blocks
- Couplant gel for acoustic transmission
- Surface cleaning tools
- Data recording system
Results and Deliverables
- Dry film thickness values
- Thickness uniformity assessment
- Calibration and measurement details
- Inspection report with readings
- Compliance evaluation with specifications
- Recommendations for coating quality
Why Choose Infinita Lab for ASTM D6132?
Infinita Lab is a trusted USA-based testing laboratory offering ASTM D6132 testing services across an extensive network of accredited facilities across the USA.
Infinita Lab is built to serve the full spectrum of modern testing needs—across industries, materials, and methodologies. Our advanced equipment and expert professionals deliver highly accurate and prompt test results, helping businesses achieve quality compliance and product reliability.
Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote
Frequently Asked Questions
ASTM D6132 is preferred when measuring coatings on non-metallic substrates such as plastic, wood, or composites. Magnetic methods require metallic substrates, while ultrasonic testing enables accurate, non-destructive measurement regardless of substrate conductivity.
Ultrasonic measurements are highly accurate when properly calibrated and used with suitable couplants. Accuracy depends on material properties, surface condition, and operator technique, but it provides reliable results comparable to destructive cross-sectioning methods.
Limitations include difficulty with very thin coatings, rough surfaces, or materials with similar acoustic properties. Proper calibration and surface preparation are essential to minimize errors and ensure consistent measurement accuracy.
Couplant ensures efficient transmission of ultrasonic waves between the probe and the coating surface. Without proper coupling, air gaps can distort signals, leading to inaccurate thickness readings and unreliable results.
Rough surfaces can scatter ultrasonic waves, reducing signal quality and accuracy. Proper surface preparation and use of adequate couplant help minimize these effects.
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