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The test Method for 45? Flame Testing
What this test is used for:
This test is used to measure and describe the properties of natural or synthetic fabrics in response to heat and flame under controlled lab conditions. Most any textile material can be evaluated using this test with the following exceptions: children<s sleepwear, protective clothing, hats/gloves, footwear, and interlining fabrics. Two factors are measured:
1. Ease of ignition (how fast the sample catches on fire).
2. Flame spread time (the time it takes for the flame to spread a certain distance).
How this test works:
Samples are mounted in a frame and held in a special apparatus at an angle of 45?. A standardized flame is applied to the surface near the lower end for specified amount of time. The flame travels up the length of the fabric to a trigger string, which drops a weight to stop the timer when burned through. The time required for the flame travel the length of the fabric and break the trigger string is recorded, as well as the fabric<s physical reaction(s) at the ignition point.
Scientific Testing Requirements:
Condition according to ASTM D1776-98
Preparing the Flammability Tester:
1. Main power switch is OFF (left side of front panel).
2. Timer is set at zero.
3. Move rack to right, using lever arm located in front panel. Place sample holder in instrument sample rack so that the longest frame is on top.
4. Using the lever, slide the rack to the left until the sample comes in contact with the L - shaped
locating arm. The burner tip now remains 5/16Y away from the face of the specimen.
6. Fill the glass U ] shaped manometer with water to a convenient level (located on the left side of the chamber).
7. Stop cord of 50/3 mercerized cotton sewing thread is threaded through instrument.
Performing the Test:
1. Turn ON main power switch.
2. Select time of Auto Impingement (1, 5, 10sec, or manual). For the purpose of this class we will use the time of 5 sec.
3. Press start button. Impingement is automatic and the flame is applied for a period of 5 sec.
4. Timer will start automatically. Starting upon application of the flame and ending when the weight is released by the burning of the stop cord.
5. Record results
6. When testing is done, switch power OFF. Turn off gas supply.
Results:
Calculations
1. Calculate the arithmetic mean flame-spread time of the six (or twelve) specimens. Add all the times together and then divide by six (or twelve).
2. If the mean time is less than 3.5 seconds, or any of the specimens do not burn, test six (or twelve) additional specimens.
3. Calculate the arithmetic mean flame-spread time for all six (or twelve) specimens. Add all six (or twelve) specimens together and divide by six (or twelve).
4. The time of flame spread is the average time for all the specimens of that sample material tested.
2019-08-02 09:53
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