3. Phương pháp kiểm tra:- Kiểm tra

3. test method:-Check the clean the grease: check grease cleaning done around 2  3 points per m2 and in about 40  50% surface area was clean. How to proceed as follows: a few Small drops of petrol to clean up a position in any of the test surface. After about 10 seconds of taking a sheet of 15  filter gas seepage new remained on the surface of steel just check, get a sheet of filter paper in the same type of small and few drops of gasoline cleaning up the paper the new filter. Wait for two traces of gasoline on two sheets of dry filter paper and compare the colors of them with the naked eye, if the color of both are the same, then the surface is considered to have a clean grease.-Check the dust made on the entire surface of steel has clean by using the Magnifier has a magnification of 6 times back up to observe, if dust is not found satisfactory.-Check the level of cleaning done on the entire surface of the steel was clean to the naked eye.

3. Test Method:
- Check the grease cleaning: Check the grease cleaning done around 2  3 points per m2 and 40  50% of the surface area was clean. How to proceed as follows: Small clean up a few drops of gasoline any location of the surface being tested. After about 10  15 seconds took a new filter paper remaining gas permeable surface on both steel test, grab a paper filter of the same type and a few drops of cleaner petrol on the paper that the new filters. Wait for two spots on both petrol and dry filter paper and compare the color of them with the naked eye, if both of the same color, the surface is considered clean grease.
- Check dust carried out over the entire surface steel surface was cleaned by using a magnifying glass with 6 times magnification or more to observe, if there was no dust is satisfactory.
- Check the cleanliness performed on the entire surface of the steel has been cleaned with the naked eye.