MFI 4050
V1.3
14
A timed test (3min or 15min) can be used for slow flowing polymers. If the
test zone of the instrument (30mm) is exceeded the test is completed and
the results will be calculated for that distance.
The MFI also has two “slice test” modes.
25mmSl- 25mm Slice Test
A test zone of 25mm is used for this test. The test zone is divided into 40
test slices, the instrument monitors the speed of the piston during each
slice. Slice speeds which are more than 2 standard deviation difference
from the average slice speed are not included in the MFI calculations.
3mmSl- 3mm Slice Test
A test zone of 3mm is used, this allows for very high viscosity polymers to
be tested.
Using these tests excludes segments of the polymer which contained
bubbles from the final calculation.
Cut off time
(Cut off test only)
In a cut off test the polymer is manually cut from the die and weighed by
the user. The user uses this parameter to set the time between cut offs.
Melt Density
(Standard Test)
There are 10 stored locations for melt density values. The user can scroll
between these stored values (+ and - buttons) or manually enter a new
value. A manually entered value is stored in the currently displayed
position.
Melt Density
(Cut off test)
The melt density is calculated during a cut off test. It is automatically
stored in one of 10 locations. Before beginning the test use the + and –
buttons to select an empty location or a previously saved value that can
be overwritten.
Performing a Standard Test
1. As described in the previous section configure the test parameters