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This is illustrated in the table below, which shows the ISO viscosity grade numbers, the mid-points of each bracket, and the viscosity limits. This system is now used to classify all industrial lubricating oils where viscosity is an important criterion in the selection of the oil.
Grease Warehouse Industrial Oils are graded in accordance with the ISO Viscosity Classification System, approved by the International Standards Organization (ISO). The ISO system is based upon viscosity at only one temperature, 40°C. ISO viscosity ranges are summarized in the table below: .
ISO VIscosity Class Ranges International Organization of Standardization (ISO) VISCOSITY CLASSIFICATION SYSTEM FOR INDUSTRIAL FLUID LUBRICANTS ISO Viscosity Grade Number Viscosity Grade Range Centistokes at 40°C Minimum Maximum 2 1.98 2.42 3 2.88 3.52 5 4.14 5.06 7 6.12 7.48 10 9.00 11.00 15 13.50 16.50 22 19.80 24.20 32 28.80 35.00 46 41.40 ...
According to JIS K 2001 “Industrial liquid lubricants - ISO viscosity classification”, 20 viscosity grades are available ranging from ISO VG 2 to 3200. The figure below shows the viscosity range associated with the operation of hydraulic systems.
HYDRAL ISO 46 High Performance Hydraulic Oil DESCRIPTION Hydraulic oils designed to deliver superior lubrication of friction parts & mechanisms. Formulated from pure mineral base oils combined with a carefully selected additive package, our hydraulic lubricants are oxidation resistant, anti-wear and low friction.
PREMIUM HYDRAL ISO 46 Excellent Performance Hydraulic Oil DESCRIPTION Hydraulic oils designed to deliver superior lubrication of friction parts & mechanisms. Formulated from pure mineral base oils with high viscosity index combined with a carefully selected additive package, our hydraulic lubricants are
ISO viscosity grade limits are +10% of the band midpoints i.e. 28.8-35.2 cSt at 40°C for ISO VG 32 fluids and 41.4-50.6 cSt at 40°C for ISO VG 46 products. The effect of temperature on viscosity can be calculated from the equation log log (v + 0.7) = 11.2164 – 4.4055 logT where v = kinematic viscosity in centistokes.
