NAS GRADE (National Aerospace Standard 1638) is a widely adopted standard to measure the contamination degree of hydraulic oil.

Both NAS 1638 and ISO 4406 focus on the methods for calculating particle counts or solid contamination levels within a fluid. NAS 1638 represents the counts of particles in five size groups: 5 to 15 microns per 100 milliliters (mL) 15 to 25 microns per 100 mL.

NAS stands for ‘National Aerospace Standard of America’. It is the standard for oil cleanliness which indicates the number of microscopic particles of different size say 2-5, 5-15, 15-25, 25-50, 50-100 and above 100 micron present in 100 ml oil sample.

There are two rating systems that define fluid cleanliness: National Aerospace Standard (NAS) 1638 and International Standards Organization (ISO) 4406. NAS 1638 defines five brackets of particle size: 5 to 15 microns. 15 to 25 microns. 25 to 50 microns.

The international standard ISO 4406, “Hydraulic fluid power — Fluids — Method for coding the level of contamination by solid particles” provides a framework for reporting the concentration of contamination particles in hydraulic oil using an automatic particle counter (like the Hiac or Accusizer 780).

Valvoline HLP hydraulic fluids are based on highly refined mineral oil and enhanced with a stabilized zinc additive system. Formulated with high quality mineral base oils and specific additives to protect against corrosion, foaming and sludge forming. Available in ISO 32, 46 , 68 viscosity grades.

RBM OIL Grade: 68 Hydraulic Oil 68, Packing Size(Litres): 5-10 and 10-15

NYBASE ISO VG 68 is an upper mid-range viscosity speciality base oil for Group I replacement, with high Viscosity Index (VI), high Flash Point (FP) and excellent low temperature properties. Recommended for the formulation of industrial, automotive and metal working fluids.

Hydraulic oil 68 grade is most commonly used for hydraulics with vane-, piston-, or gear-type pumps, especially where pressures exceed 1000 psi. They can also be used to lubricate lightly loaded reciprocating compressors.

anti-wear

The hotter the temperature, the thinner the oil becomes and the colder the oil, the thicker. So, for example, a hydraulic system operating in a cold climate like Tasmania would run better with a lower viscosity grade of 32. Here in Perth, 46 and 68 are better suited to our climate.

SAE 10W is equivalent to ISO 32, SAE 20 is equivalent to ISO 46 and 68, and SAE 30 is equivalent to ISO 100.

Transmission oil is a type of hydraulic oil! It a medium that transmits power from the engine to the transmission. Meanwhile, other types of hydraulic fluid includes multigrade engine oil, conventional and antiwear hydraulic oil. We can help you with your hydraulic oil needs!