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Your location: Home > Related Articles > Not sure how to use a 45 degree burn tester? Come in and take a look

Not sure how to use a 45 degree burn tester? Come in and take a look

Author:QINSUN Released in:2023-10 Click:35

The 45 degree combustion tester is used to test the combustion performance of textiles. Under specified conditions, place the sample at a 45° angle, light the sample and burn the sample upwards with a flame for a certain distance for the required time, to measure how violently the textile burns. For tissues with a raised surface, inflammation or melting of the base tissue is an additional indicator of the severity of the burn, but it should be noted.

What the editor wants to share with you today is the detailed operation steps of the 45 degree combustion tester:

1. Preparation 6 samples, three samples are measured, each sample is marked with two lines perpendicular to the longitudinal axis of the sample, respectively at 25 mm ± 1 mm and 100 mm ± 1 mm from the ignition end.

2. Attach the sample to the outsideremitted 25 mm from the marking line, so that its longitudinal axis is approximately horizontal and the horizontal axis forms an angle of 45±2 with the horizontal plane. A piece of horizontal wire mesh is clamped underneath. The distance between the lower bottom edge of the sample and the wire mesh is 10mm ± 1mm, and the free end of the sample is aligned with the free end of the wire mesh.

3. If the free end of the sample cannot be bent and cannot maintain the distance of 10mm ± 1mm ​​specified in step 2, a support frame should be used and the support frame should be placed on the wire mesh. , so that the support frame supports the sample to maintain a distance of 10 ± 1 mm, and the part of the support frame extending from the free end of the sample is about 10 mm. Sufficient space must be provided at the clamping ende of the sample to allow the support frame to move freely laterally. .

4. Make the central axis of the torch vertical, place the torch away from the sample, and adjust the torch at the same time to make the torch reach a stable state. When there is a dispute, use a test flame as a reference.

5. Hold the central axis of the torch tube at an angle of approximately 45° to the horizontal plane and tilt it toward the free end of the torch sample. Apply the flame to the lower edge of the free end of the sample. At this time, the central axis of the torch tube and the longitudinal lower edge of the sample are on the same vertical plane. The position of the torch must be such that the flame invades the free end of the sample over a length of approximately 6 mm.

6. As the flame front advances along the sample, remove the media at approximately the samerhythm to prevent the flame front from contacting the support frame, so as not to affect the flame or the sample. combustion.

7. Apply the flame for 30 s ± 1 s without changing the position of the flame. If the flame front on the sample reaches 25 mm within 30 seconds, remove the flame immediately. When the flame front reaches the 25mm mark, restart the timer.

8. Remove the test fireAfter the flame, if the sample continues to burn, record the elapsed time t, in seconds. When the flame front crosses the 100 mm marking line, the damage length L shall be recorded as 75 mm. If the flame front reaches the 25 mm mark but does not exceed the 100 mm mark, the elapsed time t shall be recorded in seconds and the length of damage L between the 25 mm mark and the mark before stopping the flame. the flame must be recorded in mm.

9. Test two more samples.