ISO 11007-1:2021 pdf download – Petroleum products and lubricants 一Determination of rust-prevention characteristics of lubricating greases— Part 1: Dynamic wet conditions
ISO 11007-1:2021 pdf download – Petroleum products and lubricants 一Determination of rust-prevention characteristics of lubricating greases— Part 1: Dynamic wet conditions.
CAUTION — The washing temperatures specified are significantly higher than the closed flash point of the solvent. Therefore, carry out the washing operations in a well-ventilated hood where no flames or other Ignition sources are present.
8.6 Remove the bearings from the solvent rinse solution and place on a filter paper (6.9) or cloth (6.7)
to drain thoroughly. Place the bearings in the oven (6.3) until they arc completely dry. This requires a
minimum of 15 mm.
8.7 Remove the bearings from the oven and allow cooling to ambient temperature. Examine the surfaces to ensure that each bearing is corrosion-free and free-turning.
WARNING — Take care not to spin the bearings after cleaning and drying.
8.8 Inspect the outer ring tracks using a dentist’s mirror (6.4). II etch spots or corrosion are evident, reject the bearing.
8.9 Determine the mass of grease, m, in grams, equivalent to 10,5 ml ± 0,1 ml using Formula (1:
p is the density of the grease, in kg/m3
V is the volume = 10,5 ml = 0,010 5,
lithe density of the grease is not known, it shall be determined using a pycnometer method such as that given in ISO 3838, or another standardized procedure.
Distribute 10.5 ml ± 0,1 ml of grease evenly in each test bearing, as determined by the mass gain olthe bearing. Take particular care to ensure that the outer raceway is completely coated.
8.10 Place the adaptor sleeves, bearings and V-ring seals in position on the shalt and linger-tighten the sleeve nuts. Carry out the operation with the shaft suitably supported on the work bench.
8.11 Place the shaft complete with greased hearings in position in the rig, taking care that the bearings are central In the plummer-blocks.
8.12 Place the top halves of the plummer-blocks m position and finger-tighten the locking screws.
9 Test procedure
9.1 Carry out duplicate determinations at an ambient temperature of 15°C to 25 °C. NOTE The precision data wa generated under these ambient conditions
9.2 Run the rig for 30 mm at 8.7 rad/s ± 0,5 rad/s (83 min1 ± 5 min) immediately after assembly to distribute the grease evenly.
NOTE While 80 mm 1(8.4 rad/s) is the preferred ng speed, instruments are available that run at 80 min1 and 85 mind. Ths two speeds have been demonstrated to give equivalent results. Hence the specification is 83 mm ± S mm (8,7 rad/s ±0,5 rad/s) as given in An,exA.
9.3 Remove the top halves of the plummer-blocks and introduce 10 ml of the chosen test fluid (7.3) into each side of each plummer-block using the pipette (6.5) or a syringe (I.e. a total of 20 ml). Refit the top halves of the plumn1er blacks and screw down finger-tight.
To assist in estimating percentage corrosion area, a transparent grid divided into suitable squares may be used.
NOTE The various ratings arc Illustrated In Anm&fl. In all cases, the area rclrrred to represents the whole of the track
11.2 lIthe two ratings do not agree within the precision given for repeatability, carry out two further determinations, lithe two further determinations still do not agree within the precesion for repeatability, record both results as the worst degree of rusting obtained, i.e. the highest numerical rating obtained,
The precision of the method, as obtained by statistical examination of interlaboratory test results, is given in 12.2 and 12.3.
The difference between two independent results obtained using this method for test material considered to be the same In the same laboratory, by the same operator using the same equipment within short intervals of time, In the normal and correct operation of the method that Is expected to be exceeded with a probability of S % due to random variation, is shown in Thblel.
12.3 Reproducibility R
The difference between two independent results obtained using this method for test material considered to be the same in different laboratories, where different laboratory means a different operator, different equipment, different geographic location, and under different supervisory control, In the normal and correct operation of the test that Is expected to be exceeded with a probability of 5% due to random variation, is shown in Table 2.