WWW.07MET.TK
Theory Flash point is the lowest temperature at which the application of the test flame causes the vapor above the sample to ignite. This method covers the determination of flash point of fuel oils and be used for the detection of contamination of lubricating oils by minor amount of volatile material. The sample is heated at a slow constant rate with continues stirring. A small flame is directed into the cup at regular intervals with simultaneous interruption of stirring.
Apparatus *Cover proper *Pesky Marter Closed Tester *Cup *Sutter *Stove *Air bath *Pilot flame
Procedure 1) Support the tester on a level, steady table in draft free room is good practice. 2) Prepare bathe sample a)-A sample of asphalt is heated to liquid but below to its flash point. b)-A sample with water is dehydrated by calcium chloride or filtering through a qualitative filter paper or a loose plug of dry
absorbent cotton. Then warmed the sample to liquid but below its flash point. 3) Thoroughly cleaned and dried all parts of cup and its accessories before starting the test. 4) Filled the cup with the sample to the filling mark. 5) Placed the lid on the cup and placed on the stove. 6) Ensured the locating or locking device properly engaged. 7) Insert the thermometer and lighted the flame and adjusted it to 5/32 in. in diameter. 8) Supplied heat at rate that thermometer showed 5oC/min. 9) Checked the flash point at regular intervals for about 1 sec. 10) When temperature reached to 45oC, the flame blow off, it gave flash point of the sample.
Result: Flash point is 45 c
Precautions •Note temperature reading on thermometer carefully. •Never mix the true flash point with the bluish halo that sometimes surrounds the actual flame.