Pensky Martens Closed Cup (PMCC) Apparatus is a technique to detect the flash points of distillate fuels as well as residual fuel according to ASTM D93.

2. The lowest temperature
corrected to a barometric
pressure of 101.3 kPa (760 mm
Hg) of a volatile sample, at which
application of an ignition source
causes the vapors of a specimen
of the sample to ignite under
specified conditions of test.
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3.  Temperature range 40 °C to 250 °C (Precisely).
 A brass test cup of specified dimensions with a cover of
specified dimensions.
 75 mL of sample is required for each test (Remove excess
specimen).
 The temperature of the test cup and test specimen shall be at
least 18°C or 32°F below the expected flash point.
 Test flame diameter range from 3.2 – 4.8 mm
 Gas pressure should be less than 3 kPa.
 Follow two standard operating procedures based on specimen.
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SoP - A SoP - B
Used for distillate fuels Used for Residual fuels
Temp Changes 5-6 °C/min Temp changes 1 – 1.6 °C/min
Stirring at 90-120 rpm Stirring at 250 ± 5 rpm
Apply Ignition source before
23 ± 5 °C of expected flash
point
e.g. residual fuel oils, used
lubricating oils, mixtures of
petroleum liquids with solids,
Dipping at each 1 °C for 1s only petroleum liquids that tend to
form a surface film under test
conditions
Discontinue stirring during
dipping.

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ASTM IP Range Uses
9C 15C -5 to 110 °C Low
88C 101C 10 to 200 °C Medium
10C 16C 90 to 370 °C High

6. ●》The correction factor is applicable as following-
 Corrected Fash point = C + 0.25 (101.3 – K)
 Corrected Fash point = F + 0.06 (760 - P)
 Corrected Fash point = C + 0.033 (760 - P)
●》where: C = observed Fash point, °C,
F = observed Fash point, °F,
P = ambient barometric pressure, mm Hg, and
K = ambient barometric pressure, kPa.
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7.  Handling and transportation risk assessment.
 Storage risk assessment.
 used as elements of fire safety risk assessment.
 assessing the overall flammability hazard of a material.
 detection of contamination of relatively nonvolatile or
nonflammable materials with volatile or flammable
materials.
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8.  Avoid spillage of fuel samples around instrument vicininty.
 75 mL of sample is required for each test (Remove excess
specimen).
 The temperature of the test cup and test specimen shall be at
least 18°C or 32°F below the expected flash point.
 Test flame diameter range from 3.2 – 4.8 mm
 Gas pressure should be less than 3 kPa.
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