Standard STD 420-0003
Volvo Group
Version
1
Page
10
Drying after fogging test
After the fogging test, the aluminium foil shall be dried at 23 ± 1 °C with silica gel for 3 h and 45 min ± 15 min.
When the silica gel has lost its blue colour, it shall be regenerated by driving out the water. The silica gel shall then
be heated in an oven 175 ± 5 °C for at least 30 min.
6.2.2 Cleaning
Wash the sealing rings, beakers and metal rings with glass-cleaning detergent twice in a dishwasher. If the
dishwasher is not connected to a deionized-water supply, rinse the cleaned equipment in deionized water.
6.2.3 Control test with DIDP
Once a month a control test shall be carried out in parallell. The test is carried out by pouring 10 g ± 0,1 g of DIDP
into the beaker in such a way that the DIDP does not make contact with the sides of the beaker (above the surface
of the fluid).
Place the beaker with the DIDP in the bath, using different positions for each test. After the test period of 16 ± 0,2 h
at the bath temperature of 100 ± 0,5 °C, the fogging value shall be within ± 0,25 mg of the value stated on the
bottle. If this is not the case, check the test conditions.
At each test, the beaker with DIDP shall be moved between the different positions so that it will not be put in the
same place as during the previous test.
The results from the control tests shall be documented and shall be available for reporting in connection with any
audit of equipment, etc.
Observe instructions in accordance with the safety sheet for DIDP.
Note: It is very important not to moisten the walls of the beaker with the DIDP when handling the beaker as this will
lead to a larger area with DIDP and a higher test result.
6.2.4 Procedure
6.2.4.1 General
Place one test piece in each beaker with the side that is visible in the car facing up.
Place the sealing ring on the beaker and put the aluminium foil with the shiny side facing down on the sealing ring,
and place the glass plate on top. Place the beaker in the bath and put a filter paper between the glass plate and the
cooling plate. This shall be done when the required temperature has been reached.
The distance between the bath and the edge of the glass plate shall be 60 mm ± 2 mm (see Figure 1). The test
shall last for 16 h ± 10 min at the prescribed temperature.
After the test, the aluminium foil shall be carefully removed and moved to the dessicator. It shall be dried in a
dessicator with silica gel for 3 h and 45 min ± 15 min with the fogging side facing up (the shiny side). It is important
that the foil is not exposed to direct sunlight while drying.
6.2.4.2 Weighing the aluminium foil
The aluminium foil is weighed before and after the test with an accuracy of ± 0,01 mg. The post-test weighing shall
be carried out after the aluminium foil has been dried in a dessicator with silica gel. Lint-free cotton gloves or
polyethylene gloves shall be used during weighing to avoid contamination.
Carry out measurements on minimum two test pieces. If the mass, Gj, of the condensable constituents deviate by
more than 0,2 mg or 10 % from the mean value, and none of the test pieces is approved, test a further two test
pieces and calculate the average of the results obtained for all test pieces.
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