How many items are involved here?
1, ISO viscosity grade?
Iso viscosity grade is one of the most basic, important and correct uses of oil selection. ISO is the abbreviation of an organization. Its full name is International Organization for Standardization, which is translated from Chinese as "International Organization for Standardization". ISO is the largest international standardization organization in the world. It was founded on February 23rd, 1947 at/kloc-0. Its predecessor was the International Federation of Standardization Associations (ISA), which was founded at 1928.
He is older than IEC. IEC, the International Electrotechnical Commission, 1906 was established in London, England, and it is the earliest international standardization organization in the world. IEC is mainly responsible for standardization activities in the fields of electrician and electronics. ISO is responsible for standardization activities in all other fields except electrical and electronic fields. ISO claims that its purpose is "to promote the development of standardization and related activities worldwide, so as to facilitate the international exchange of goods and services and carry out cooperation in the fields of intelligence, science, technology and economy.
ISO has 1 17 members, including 1 17 countries and regions. The highest authority of ISO is the annual General Meeting of Members, and its daily office is the Central Secretariat, located in Geneva, Switzerland. At present, the Central Secretariat has 65,438+070 employees and is headed by the Secretary-General. "iso viscosity grade" is a viscosity grade certified by the International Organization for Standardization.
SAE viscosity grade viscosity median (40℃, cm) kinematic viscosity range (40℃, cm)
Minimum value maximum
ISO VG 22.2 1.982.42
ISO VG 33.22.883.52
ISO VG 54.64. 145.06
ISO VG 76.86. 127.48
ISO VG 10 109.00 1 1.0
ISO VG 15 15 13.5 16.5
ISO VG 2222 19.824.2
ISO VG 323228.835.2
ISO VG 46464 1.450.6
ISO VG 68686 1.274.8
ISO VG 100 10090.0 1 10
ISO VG 150 150 135 165
ISO VG 220220 198242
ISO VG 320320288352
ISO VG 4604604 14506
ISO VG 6806806 12748
ISO VG 1000 1000900 1 100
ISO VG 1500 1500 1350 1650
kinematic viscosity
It is a measure of the internal friction when a liquid flows under the action of gravity, and its value is the ratio of the dynamic viscosity of the liquid to its density at the same temperature, which is taken as m2/s in China's legal units of measurement. Habitual CST,1CST =1mm2/s.
To sum up, "lubricating oil viscosity 220" means that the kinematic viscosity of lubricating oil at 40℃ is 220 cm.