Textile Thermal Resistance and Moisture Resistance Test Procedure ISO 11092

This article demonstrates the test procedure of a tester primarily used for determining the thermal resistance and moisture resistance of various textiles and fabrics, as well as films, coatings, foams, leathers, and composite materials under steady-state conditions. The test is conducted on the YG(B)606G tester of DaRong.

Standards: ISO11092:2014, ASTM D1518, ASTM F1868 (A-E), JIS L1096, NFPA 1971

Thermal Resistance and Moisture Resistance Test Procedure

1. Usage Method: Ensure the instrument is properly connected, turn on the main power, and wait for the touchscreen system to initialize and automatically enter the main interface. Set the respective parameters for temperature, humidity, and time. The set time can be adjusted as needed, and the instrument will stop automatically after the set time. Setting the time to ‘0h0m0s’ will run the instrument continuously. After setting all parameters, close the chamber door and click the start button to initiate the test. During the test, the stop button can be pressed at any time to stop the test. Before the formal test, the instrument should be preheated for more than one hour to ensure data stability.

2. System Settings: In the system settings under “General,” you can modify general functions such as the interface language. After modifications, click ‘save’. This interface also displays version numbers for the touchscreen and main control chip.

3. Instrument Calibration: The instrument’s temperature and humidity sensors are precisely calibrated before leaving the factory, and users generally do not need to calibrate them. If calibration is needed after prolonged use or as required by the user, enter the calibration interface by entering the password and clicking ‘confirm’. This instrument uses an advanced multi-point calibration (up to 5 points) algorithm, which is simple to calibrate, and stable and reliable. The “Pre-Calibration Temperature/Humidity” is the sensor’s original temperature and humidity value before calibration, which is displayed in real-time at the top. The “Post-Calibration Temperature/Humidity” is the sensor’s temperature and humidity after multi-point calibration, which will ultimately be displayed on the main interface. In the calibration table, the “Pre-Calibration Temperature/Humidity” is the original data read from the sensor and needs to be entered into this table. The “Post-Calibration Temperature/Humidity” is the standard data read from external standard instruments and needs to be entered into this table. The data in the same row must be arranged in ascending order from left to right, otherwise, the calibration data will be incorrect. After entering the calibration values, click “Save” to save the calibration values.

4. Thermal Resistance Test:

a. Add or Modify Standards:

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Click the menu bar (System Settings) and (Test Standards) to open the standard dialog box. You can create new, delete standards, or modify existing standard parameters. Detection time is the time required for all data to meet the following parameters. Maximum CV for thermal resistance and moisture resistance is typically set at 2.5%, with a smaller value indicating higher repeatability and stability of the sample, requiring longer testing time. A larger value decreases repeatability and stability but shortens testing time, with the shortest time being the set detection time. Set the experimental board temperature and maximum deviation, typically 35℃ with a deviation of ±0.02℃, monitoring both the thermal guard ring and the bottom plate. Set the climate chamber’s environmental temperature, humidity, and wind speed according to the standards and actual conditions. Select the monitoring range as the entire cycle by default.

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b. Create New File:

Click the toolbar (New) button. After setting the new file’s content, click the toolbar save button.

English Version Available
English Version Available

c. Place Sample and Adjust Height: Place the sample as described in section 6.2.4.

d. Adjust Environmental Temperature and Humidity: Adjust the constant temperature and humidity chamber’s settings as described in section 6.1.

Note: The displayed temperature and humidity of the constant temperature and humidity chamber may differ from the computer software display due to sensor placement differences. The computer display should be used as the reference, and the chamber’s settings should be adjusted accordingly.

e. Start Blank Plate Value Test or Thermal Resistance Test: Click the start button in the above image to start testing the sample. Click the blank plate value button to start the blank plate value test. After the test, click Confirm to save the data. To ensure data accuracy, preheat the machine for one hour before starting the blank plate value test, and conduct the blank plate value test twice consecutively. The blank plate value can be tested once a week, with different standards requiring corresponding blank plate values. Remove the water level sensor in Figure 2 during the test. After the moisture resistance test, wait at least three hours before conducting the thermal resistance test.

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5. Moisture Resistance Test:

a. Add or Modify Standards: Same as above.

b. Create New File: Same as above.

c. Adjust Environmental Temperature and Humidity: Same as above.

d. Add Water: Remove the water level sensor 9 in Figure 2 (the float is below the sensor). Press the water inlet button on the panel (blue light indicates active). After 2-3 minutes, water droplets will appear on the test bench (ensure the water tank has enough deionized water). Use a sponge to evenly distribute the water, then cover with a film.

e. Cover with Film: When there is enough deionized water on the test bench, place a breathable, water-impermeable film on the test bench to soften it. Cover the entire test bench and use a dry sponge to remove air bubbles from under the film. Use silicone rubber strips to press the film into the circular groove to prevent it from falling off (fold any excess film inward to prevent water overflow).

f. Place Sample and Adjust Height: Place the sample as described in section 6.2.4.

g. Start Blank Plate Value Test or Moisture Resistance Test: Click the start button in the above image to start testing the sample (input the corresponding thermal resistance value), or click the blank plate value button to start the blank plate value test. After the test, click confirm to save the data. To ensure data accuracy, preheat the machine for one hour before starting the blank plate value test, and conduct the blank plate value test twice consecutively. The blank plate value can be tested once a week, with different standards requiring corresponding blank plate values.

h. Heat Loss Verification (According to ASTM F 1868 Part C):

  • Set conditions in accordance with ASTM F 1868 Part C.
  • Conduct five thermal resistance tests as described in section 6.2.2. The first is the bare plate value RCT0, with each subsequent test adding a layer of standard textile sample.
  • Conduct five moisture resistance tests as described in section 6.2.3. The first is the bare plate value RET0, with each subsequent test adding a layer of standard textile sample.

6. Sampling and Placing Samples:

Typical textile sample size is 525mm*525mm. Cover the sample on the plate surface and ensure no air between the sample and test bench. Foam and semi-rigid materials are particularly prone to air pockets, which have inherent thermal resistance. Cover the sample and use the sample retaining clip to prevent air from entering the sample bottom during the test. Use height gauge blocks to adjust the test bench height, ensuring the wind speed sensor is 15mm directly above the sample.

Formulas of Themal Resistance and Moisture Resistance Test

Thermal Resistance

 

𝑅𝑐𝑡=Sample Thermal Resistance+Blank Plate Thermal Resistance

𝑇𝑠𝑘𝑖𝑛=Average Test Plate Temperature

𝑇𝑎𝑚𝑏=Average Ambient Temperature

𝑄/𝐴=Heat Flux per Unit Area

𝑅𝑐𝑡0=Blank Plate Thermal Resistance

𝑅𝑐𝑓=Sample Thermal Resistance

𝑅𝑐𝑙𝑜=Clo Value

Moisture Resistance

Under Isothermal Conditions:

𝑃𝑠𝑎𝑡=Saturated Water Vapor Pressure at Surface Temperature

𝑃𝑎𝑚𝑏=Ambient Water Vapor Pressure at Ambient Temperature

𝑄𝐴=Heat Flux per Unit Area

𝑅𝑒𝑡=Sample Moisture Resistance+Blank Plate Moisture Resistance

Under Non-Isothermal Conditions:

𝑃𝑠𝑎𝑡=Saturated Water Vapor Pressure at Surface Temperature

𝑃𝑎𝑚𝑏=Ambient Water Vapor Pressure at Ambient Temperature

𝑄/𝐴=Heat Flux per Unit Area

𝑇𝑠𝑘𝑖𝑛=Average Test Plate Temperature

𝑇𝑎𝑚𝑏=Average Ambient Temperature

𝑅𝑐𝑡=Sample Thermal Resistance+Blank Plate Thermal Resistance

𝑅𝑒𝑡=Sample Moisture Resistance+Blank Plate Moisture Resistance

𝑅𝑒𝑓=Sample Moisture Resistance

𝑅𝑒𝑡0=Blank Plate Moisture Resistance

Maintenance and Care

  1. Initial Setup: Upon receiving the instrument, add a sufficient amount of antifreeze to the antifreeze tank before turning it on to ensure normal operation.
  2. Water Tank Refilling: When the water tank is low on water, refill it appropriately. Do not overfill to avoid overflow (as the water pump will extract some water during operation, and this water will return to the tank when the instrument stops running). Avoid placing strong interference sources such as large frequency converters or motors around the instrument’s operating environment to prevent interference with its normal operation.
  3. Electrical and Water Facilities: Install electrical and water facilities that meet the required standards according to the instrument’s usage instructions to avoid electric shock or water leakage.
  4. Avoid Electromagnetic Interference: Keep the instrument away from sources of electromagnetic interference to prevent damage and ensure the accuracy of test data.
  5. Handling High Temperature or High Force: Operate high-temperature or high-force instruments strictly according to the instructions to avoid burns or injuries.
  6. Instrument Care: The instrument should not be exposed to moisture, tilted, or placed upside down. Regular maintenance and timely cleaning are necessary to ensure the instrument’s longevity and the accuracy of subsequent tests.

Related Resources

ISO 11092 Textiles Thermal Resistance Tester YG(B)606N

Sweating Guarded Hotplate

ASTM D1518 Fabric Insulation Tester YG(B)606EC

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