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Test process of medical mask flame retardancy tester

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Test process of medical mask flame retardancy tester

Author: Date :2021-05-11 Views: order
The flame retardancy tester for medical masks is equipped with a lead mold that is exposed to flame at a certain linear speed to test the combustion performance of medical surgical masks, disposable medical masks, ordinary masks, civilian masks, protective masks, gas masks, etc.
   Test principle:
   1. Use a standard energy heat source to test the mask to observe the burning behavior of the mask. The energy of the fire source is guaranteed by measuring the height and temperature of the flame.
  2. The time for masks or other samples to pass through the fire source is stipulated by the standard, and the action time of the fire source is guaranteed by controlling the moving speed of the face mask.
  3. The burning behavior of the sample is measured by the flame burning and flameless burning of the sample.
  Applicable standards:
   GB 2626-2006 Respiratory protection equipment self-priming filter anti-particulate respirator
  GB 2890-2009 Respiratory protection self-priming filter type gas mask
   GB 19083 "Technical Requirements for Medical Protective Masks-Flame Retardant Performance"
   GB 21976.7-2012 Building fire escape and refuge equipment Part 7: Filter type fire self-rescue breathing apparatus
  YY 0469-2011 "Medical Surgical Mask"
  BS EN 136

Test process of medical mask flame retardancy tester(图1)

The main parameters:
   1. The horizontal movement linear velocity of the nose of the head mold is (60±5) mm/s, and the head mold can rotate in the vertical plane;
  2. Flame height can be adjusted (standard requirement 40±4mm);
  3, the diameter of the flame temperature thermocouple measuring probe is 1.5mm;
  4. The flame temperature is (800±50)℃ at the height of (20±2)mm from the top of the burner;
  5. The wall thickness of the metal head mold is 2~3mm, which is flame-resistant and burn-resistant;
  6. Timer for continuous burning time and smoldering time: 0-99.99 seconds, accuracy: ±0.01 seconds;
  7. Power supply: AC220V, 50Hz, 50W;
   8. Weight: about 30kg.

Test process of medical mask flame retardancy tester(图2)

Test procedure:
  01. Plug in the power socket on the back cover of the instrument to turn on the power, connect the air inlet to the propane cylinder, and open the gas cylinder valve to switch on the gas source.
  02. Close the front door of the combustion test chamber, and place the "power" switch in the "on" position, and the power indicator light is on.
       03. Make the nose tip of the metal head mold downward, put the mask on the metal head mold, and slightly force the head mold with your hands. When the nose tip of the head mold is just above the igniter, adjust the height of the igniter head (clockwise) Rotate the igniter head to lower, and rotate the igniter head counterclockwise to raise it so that the distance between the tip of the igniter and the tip of the nose of the head die is 20±2mm.
  04. Press the "Igniter Return" button to restore the burner to the ignition position.
  05. Press the "head mold return" button to return the head mold to the starting position. Press the "Zero" key, and the instrument will return to the initial state.
       06. Keep pressing the "ignition" button, adjust the propane medium pressure valve "pressure adjustment" knob (according to the end of the knob indicating the "+" direction to increase, "-" direction to decrease to adjust), so that the top pressure of the instrument box The pointer of the meter points at 20kPa.
  07. At this time, the ignition resistance wire has turned red. After lighting the igniter, release the "ignition" button. When it is difficult to ignite, please adjust the "flame adjustment" button, the clockwise direction is to reduce the flow of combustible gas, and the counterclockwise direction is to increase the flow of combustible gas. If the ignition fails for some reason, in order to prevent the gas from continuing to pass in and cause an explosion, click "Continue Burning Stop" to stop the gas, and then click "Clear" to restore the initial state.
      08. Open the front door of the combustion test chamber, place the flame height gauge (height 40mm) directly in front of the flame by hand, turn the "flame adjustment" knob to adjust the flame height to 40mm ± 2mm, after the flame stabilizes, remove the flame height gauge, At this time, observe whether the “temperature display” on the panel of the instrument is stable at 800±50℃. If it is not enough, it can be adjusted by increasing the inlet pressure of the gas cylinder pressure reducing valve to stabilize the flame temperature at 800±50℃.
       09. Press the "ignition start" button to move the igniter to the ignition position, press the "head mold start" button, the head mold starts to rotate, after the head mold rotates in place, the igniter stops gas and resets, "continue burning time" "Automatic timing, after the continuous burning, press the "continuous burning stop" button, if there is no continuous burning, directly press the "continuous burning stop" button, wait until the smoldering ends, then press the "smoldering stop" button, and record the continuous burning time And smoldering time.
   10. Press the "head mold return" button to restore the head mold to the starting position, open the front door of the combustion test box to remove the sample, and the test is over.
  11. Press the "Zero" button, the instrument will return to the initial state, and the next mask sample will be put on the metal head mold. At this time, the next test can be carried out according to the steps. If you don't need the next test, please turn off the power, unplug the power plug, take out the residue container, and clean up the burning residue.
   12. If you want to test the flame retardancy of the mask belt, you must put the mask on the metal head mold, loosen the "head mold positioning screw", and rotate the head mold to make the mask belt downward. Press the "head mold start" button, the head mold starts to rotate, when the head mold is just above the igniter, press the "smolder stop" button to stop the head mold, adjust the height of the igniter head to make the top of the igniter The distance from the lowest part of the head mold is 20±2mm.
   13. When testing materials, use injection molding, compression molding or compression molding to make the required shape. If the above method is not feasible, a sample should be cut from a representative sample of the material. After the production is completed, use fine sandpaper to smooth each cut surface of the incision, and carefully remove all dust and particles on the surface. The sample size should be at least 60mm long and 60mm wide (inside the fixture). The thickness values ​​include: 0.1mm±0.02mm, 0.2mm±0.02mm, 0.4mm±0.05mm, 0.75mm±0.10mm, 1.5mm±0.15mm, 3.0mm±0.2mm or 6.0mm±0.4mm.
   When testing the finished product, if possible, the sample should be a complete product. If the test cannot be performed on the complete product, you can:
  A) Cut a piece of the parts to be inspected;
  B) Make a small hole in the complete product to make it contact with the glow wire;
  C) Take out the parts that need to be inspected from the complete finished product and conduct individual tests.

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