UL94 Standard Horizontal and Vertical Flame Tester Operation Procedure

UL94 Standard Horizontal and Vertical Flame Tester will be one of the following four forms (regardless of color), the following different configurations of horizontal and vertical flame testers are from Jonglei Instruments. The different configurations are the same in terms of operation procedures.

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Tips: In order to ensure the safe transportation of the equipment, the factory fixed the main parts with zip ties before shipment. After the arrival of the instrument before use, please remove the ties that bind the instrument's Bunsen burner and sample holder.

UL94 Standard Horizontal and Vertical Flame Tester Operation Procedure

1. Prepare at least one set of three specimens in accordance with the corresponding specimen preparation standard. 2.

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2. hold the specimen parallel to the longitudinal axis of the specimen holder and at an angle of 45 degrees to the transverse axis. 3. place a drop pan under the specimen.

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3. Place a drip tray on the lower part of the specimen. Turn on the knob on the meter counterclockwise. 4.

4. Turn on the three-phase power supply, turn on the power switch, if you need to carefully observe the combustion of the specimen, you can use your hand to rotate the lighting inside the combustion box to adjust it to a suitable viewing angle. 5. Press the control panel section.

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5. Press the "Return" key on the control panel to return the Bunsen burner to the left side. (The return key restores the unit to its original state.)

6. Press "Start" to move the Bunsen burner to one end of the model, unscrew the locking screws on the bracket of the Bunsen burner and the sliding block of the model bracket, adjust the distance between the Bunsen burner and the model, so that the lamp port of the Bunsen burner is under the free end of the model, and then press "Up" and "Down" to adjust the distance between the Bunsen burner and the model. Adjust the height of the model by pressing the "Up" and "Down" buttons, so that the free end of the model is located 10mm above the free end of the Bunsen burner. When the adjustment is completed, press the "Return" button to return the Bunsen burner to its original position. (This procedure can be referred to the demonstration video of automatic adjustment of CZF-5 type horizontal and vertical combustion tester released by Jonglei.)

7. Adjust the "Flow Meter", light the Bunsen burner and adjust the knurled nut at the lower end of the Bunsen burner to produce a 20mm high blue flame when the burner is in the vertical position. Tilt the Bunsen burner at 45 degrees. 8.

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8. Press "Start" to apply flame to the specimen. At the end of the flame application time, the Bunsen burner returns automatically. If the specimen continues to burn (either flamed or flameless) after the flame application is stopped, record the burning time t (in seconds) from the 25 mm mark to the end of the burning front, and record the burn length L, (in millimeters) from the 25 mm mark to the end of the burning front. When the self-supporting sample can be burned, the non-self-supporting sample should be clamped to the right; when the non-self-supporting sample is burned, the sample should be observed to burn and the sample clamp should be gradually returned to the right.

9. There are two cases in this process

① Apply the flame end, the sample did not burn to 25mm, to the sample burned to 25mm when pressing the "flaming time" flaming time stops the clock, the flameless time starts the clock, when the sample is extinguished or burned to 100mm press the "flameless time" flameless time stops the clock, this time the flameless time stops the clock. time stop timing, this time the flameless time for the combustion time.

② apply the flame has not yet ended, the sample has been burned to 25mm, press the "return" Bunsen burner automatically return to the original position, at the same time, the flaming time to start timing, when the sample is extinguished or burned to 100mm press the "flaming time" flaming time to stop the clock, the flaming time is the burning time. At this time, the flaming time is the burning time.

Note: If the combustion front crosses the 100m m mark, then record the time required to burn from the 25mm mark to the 100mm mark t, at this time the burn length is 75mm; if the combustion front is not burned to 100mm, the burn length of 25mm to the extinguishing point of the distance.

If the ignition source is removed, the flame is extinguished or the burning front does not reach the 25m m mark, the burning time, burn length and linear burning speed are not counted.

The operator should record the actual burning length and calculate the burning speed according to the following formula


    V= ---


Where: V - linear burning speed, (mm/min), L - burn length (mm), t - time used to burn L length (S)

10. test another two specimens.

11. If only one specimen in this group does not conform to the GHB/HB40 material classification criteria, another group of specimens shall be tested, and all specimens in the second group shall conform to the criteria of the relevant class.

12. After the test is completed, press the exhaust button to exhaust the waste smoke generated by combustion in the device, and clean up the combustion residues in the drip tray.

13. According to the test results issued by the test report, the test report should include the following:

a. Note the use of test standards

b. Identification of the product under test details, including the name of the manufacturer, number or code and color

c. Specimen thickness (should be accurate to 0.1mm)

d. Nominal performance density (required if the test material is rigid foam)

e. Direction of anisotropy with respect to specimen size

f. Conditioning treatment

g. Pre-test treatments other than cutting, trimming and conditioning

h. Indication of whether there is continuous flaming of the specimen after flame application

i. Indicate whether the flame front passes the 25 mm and 100 mm markers

j. For specimens where the flame front passes the 25 mm but not the 100 mm mark, the time elapsed for burning and the length of the damage

k. for specimens with flame fronts at or above the 100 mm mark, the average burning rate V

l. Indicate whether there are any burning particles or drops in the specimen.

m. Indicate whether or not a support is used for the soft specimen.

n. Passing grade.