ASTM C679: Elastomeric Sealant Tack Free Time Testing Services
ASTM C679 determines the Tack-Free Time of Elastomeric Sealants, a type of mending glue used in construction. In this test, the sealant specimen is lightly touched with a polythene film at regular intervals to determine the time it takes for the sealant to dry.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
What Is ASTM C679 Elastomeric Sealant Tack Free Time?
ASTM C679 specifies the tack-free time of elastomeric sealants, the time required for the sealant’s surface to lose its stickiness after application. This property is critical for handling, finishing, and exposure to environmental conditions.
This test is widely used in construction, glazing, and sealant manufacturing industries. It ensures that sealants cure properly and become resistant to dust, dirt, and handling within a predictable timeframe.
Applications and Benefits of ASTM C679 Elastomeric Sealant Tack Free Time Testing
Scope
ASTM C679 evaluates the surface curing behavior of elastomeric sealants by determining the time required to reach a tack-free state under controlled conditions.
The test evaluates:
- Tack-free time of sealants
- Surface curing characteristics
- Resistance to contamination after application
- Effect of environmental conditions on curing
- Suitability for field application
Applications
- Construction sealants and joint fillers
- Window and glazing sealants
- Automotive and industrial sealants
- Adhesives and bonding materials
- Waterproofing systems
- Quality control in sealant production
Benefits
- Ensures proper curing performance of sealants
- Helps prevent contamination during application
- Supports efficient installation processes
- Assists in product development and formulation
- Enables comparison of sealant performance
Our ASTM C679 Testing Procedure
Sample Preparation
Sealant is applied on a standard substrate in a uniform layer.
1Environmental Conditioning
Specimen is maintained under controlled temperature and humidity.
2Tack Assessment
Surface is periodically touched using a standard probe or film.
3Data Recording & Evaluation
Time required to reach tack-free condition is recorded.
4ASTM C679 Test Parameters and Requirements
| Parameter | Details |
|---|---|
| Applicable Materials | Elastomeric sealants |
| Test Temperature | ~23°C ± 2°C |
| Relative Humidity | ~50% ± 5% |
| Film Thickness | ~1.5 mm to 3 mm |
| Test Duration | ~10 minutes to 24 hours |
| Measured Outputs | Tack-free time (minutes or hours) |
- Controlled environment chamber
- Application tools (spatula or applicator)
- Substrate panels
- Timing devices
- Inspection tools
- Data recording system
Equipment and Instrumentation Used for ASTM C679 Testing
What You Receive: Test Report, Data, and Certification
- Tack-free time values
- Surface curing performance evaluation
- Comparative sealant analysis
- Application suitability assessment
- Test condition summary
- ASTM compliance report
ASTM C679 Elastomeric Sealant Tack Free Time FAQs
ASTM C679 determines the tack-free time of elastomeric sealants. It measures the time required for the surface to lose stickiness. This helps evaluate curing behavior and handling properties.
Key parameters include temperature, humidity, exposure time, and application thickness. Test conditions are controlled to ensure repeatability. These factors influence curing rate and surface drying.
The test measures time required for the sealant surface to become tack-free. This is determined by light contact without adhesion. Results indicate curing speed and usability.
ASTM C679 is used for elastomeric sealants. This includes silicone, polyurethane, and other construction sealants. These materials are used in joints and sealing applications.
ASTM C679 is conducted under controlled laboratory conditions. Results may vary with environmental conditions and application methods. It may not fully represent curing behavior in field conditions.
Why Choose Infinita Lab for Elastomeric Sealant Tack Free Time Testing
At the core of this breadth is our network of 2,000+ accredited laboratories across the USA, offering access to over 10,000 testing methods and analytical services. From advanced materials characterization (SEM, TEM, RBS, XPS) to mechanical, chemical, environmental, biological, and standardized ASTM/ISO-compliant testing, we deliver unmatched flexibility, specialization, and scale. You are never limited by geography, facility, or methodology — Infinita Lab connects you to the right expertise and testing solution, every time.
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