Weather resistance test of PTFE (Polytetrafluoroethylene) film composite terry cloth fabric is designed to evaluate its performance stability under different ambient conditions. Here are some key steps and methods for weather resistance testing:
1. Test purpose
- Detection of performance changes of PTFE film composite terry cloth fabric under long-term exposure to natural or artificial environmental conditions.
- Ensure that the material maintains good physical, chemical and mechanical properties during use.
2. Test items
According to actual application requirements, weather resistance testing usually includes the following aspects:
(1) Ultraviolet aging test
- Objective: To evaluate the anti-aging ability of the material under ultraviolet irradiation.
- Method:
- Ultraviolet radiation in sunlight is simulated using UV chamber (UV chamber).
- Test conditions: Set UV intensity, temperature and humidity cycle.
- Test cycle: usually several hundred hours (such as 500 hours or 1000 hours), the specific time depends on the standard requirements.
- Evaluation indicators:
- Color change (measure ΔE value by a colorimeter).
- Strength loss (tensile strength, tear strength, etc.).
- Surface appearance changes (such as cracking, powdering, fading, etc.).
(2) Hydrogen Aging Test
- Objective: To evaluate the durability of materials in high temperature and high humidity environments.
- Method:
- Use a constant temperature and humidity test chamber to set a specific temperature (such as 40°C or 60°C) and relative humidity (such as 90%-95%).
- Test cycle: usually hundreds of hours (such as 500 hours or 1000 hours).
- Evaluation indicators:
- The water absorption rate changes.
- Dimensional stability.
- Surface adhesion and peel strength.
(3)Salt spray corrosion test
- Objective: To evaluate the corrosion resistance of materials in salt-containing environments (such as marine climate).
- Method:
- Use a salt spray test chamber to simulate a salt spray environment.
- Test conditions: 5% NaCl solution, temperature around 35°C.
- Test cycle: Usually 72 hours or more.
- Evaluation indicators:
- Corrosion phenomenon (such as surface discoloration, bubbles, peeling).
- Whether functionality is affected.
(4)Hot and cold cycle test
- Objective: To evaluate the performance stability of the material under extreme temperature changes.
- Method:
- Use hot and cold impact test chambers to simulate alternating environments of high and low temperatures.
- Temperature range: For example -40°C to 80°C.
- Number of cycles: usually dozens to hundreds of times.
- Evaluation indicators:
- Difference of material.
- Whether there are cracks or stratification on the surface.
(5)Chemical resistance test
- Objective: To evaluate the resistance of materials to common chemicals (such as acids, alkalis, solvents).
- Method:
- Soil the sample in different chemical reagents (such as sulfuric acid, sodium hydroxide, alcohol, etc.).
- Test time: usually 24 hours or longer.
- Evaluation indicators:
- The color, shape and intensity of the material change.
(6)Outdoor sun exposure test
- Purpose: To evaluate the resistance of materials in real natural environmentsperformance.
- Method:
- Place the sample in an outdoor sun exposure site and expose it to natural conditions such as sunlight, rain, wind and sand.
- Test cycle: usually several months or even more than one year.
- Evaluation indicators:
- Color change.
- Several degree of surface wear and aging.
3. Test standard reference
The following are some common international and national standards that can be used as the basis for weather resistance testing:
- ISO 4892: Weather resistance test of plastics and polymer materials.
- ASTM G155: UV accelerated aging test for non-metallic materials.
- GB/T 16422: Plastic laboratory light source exposure test method.
- ISO 9227: Salt spray corrosion test.
- ASTM D2247: Textile washing resistance performance test.
4. Test results analysis
- Compare the performance data of the samples before and after the test to calculate the percentage of performance degradation.
- Judge whether the materials are qualified based on industry standards or customer needs.
- Propose improvement suggestions, such as adjusting the thickness of PTFE film, optimizing the composite process or adding functional additives.
5. Precautions
- Ensure consistency of sample preparation before testing.
- The test conditions should be as close as possible to the actual use environment.
- Record detailed test parameters and results for subsequent analysis and improvement.
Through the system’s weather resistance test, the performance stability of PTFE film composite terry cloth can be comprehensively evaluated, providing a scientific basis for product design and optimization.
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