BS ISO 2137:2020 pdf download.Petroleum products and lubricants — Determination of cone penetration of lubricating greases and petrolatum.
8.2.2.2 Jar the cup sharply on the bench or floor and pack the grease down with the spatula (fifl) to fill the holes left by the plunger and to remove any air pockets.
The jarring should he as vigorous as is required to remove the entrapped air without splashing the sample from the cup. When performing these operations, a minimum of manipulation shall be used. as continued agitation of the grease can have the effect of increasing the working beyond the specified 60 strokes.
8.2.2.3 Scrape off the excess grease extending above the rim of the cup, creating a flat surface, by moving the blade of the spatula, held inclined toward the direction of motion at an angle of approximately 45°, across the rim of the cup. Retain the portion of grease that is removed.
8.2.2.4 Particularly when testing soft greases, retain the grease removed when scraping the cup to provide a full cup for subsequent tests. Keep the outside of the rim of the cup clean so that the grease forced by the penetrometer cone to overflow the cup can be returned to the cup prior to preparing the sample for the next test.
8.2.3 Penetration measurement
8.2.3.1 Determtne the penetration of the sample as described in 1.2 and Li1.
8.2.3.2 Immediately make two more determinations in succession on the same test portion. First, return to the cup the portion of grease previously removed with the spatula in 8223. Then repeat the operation specified in 8,22 through 823J. Record the three values obtained.
8.3 Procedure for prolonged worked penetration
8.3.1 Preparation of apparatus and test portion
8.3.1.1 Temperature
Maintain the temperature of the room used for the test within the range of 15 °C to 30 °C. No further control of the grease worker temperature is necessary, but, before starting the test, the grease shall have been in the room for sufficient time to bring its temperature within the range of 15°C to 30 °C.
8.3.1.2 Working
Fill a clean grease worker cup and assemble the worker as described in 8.2.1.2. Subject the grease sample to the prescribed (for instance 100 000) or agreed number of double strokes.
In order to minimize leakage during working, special attention should be paid to the gland in the grease worker cover.
8.3.2 Penetration measurement
Immediately after the working has been completed, place the grease worker in a constant-temperature water bath or air bath () to bring the test portion temperature to 25,0 °C ± 0,5 °C within 1,5 h. Remove the worker from the bath and subject the grease to a further 60 (63 mm to 71,5 mm) double strokes. Prepare and penetrate the test portions as described in 8.2.2 and 8.2.3.BS ISO 2137 pdf download.