Oil Features

Viscosity

The viscosity of an oil is important for its cooling and lubricity properties. The lower the viscosity, the better the cooling. An increase in temperature reduces the viscosity. The rate of change in viscosity with temperature can be expressed in terms of viscosity index (VI). A small reduction in viscosity coupled with a large temperature changes indicates a high viscosity index.

Paraffinic oils have a higher VI than naphthenic oils. A high VI is required in certain applications.

Automotive lubricants is one example where lubrication is needed at both high and low temperatures. However, for cooling applications, such as metal working or quenching, a low VI is better because of the lower viscosity (better heat transfer) at operating temperatures. Viscosity (kinematic) is measured according to ASTM D 445.

FLASH POINT

FLASH POINT

The flash point of an oil is specified for safety reasons, but also because it indicates how volatile the oil is. Light parts of the oil determine the flash point which is extremely sensitive to contaminants from lighter oils, such as gas oil or gasoline. The flash point is reached when the oil releases enough gases to make the gas mixture above the oil ignitable in the presence of an open flame. The PM (Pensky Marten) closed cup method (ASTM D 93) gives the best repeatability. Another method is the COC (Cleveland Open Cup) ASTM D 92, which, generally, gives 5- 10°C higher flash point values. This method is often used in the USA and elsewhere for formulated products.

FLASH POINT VS BOILING RANGE

It is at the low temperature area of the boiling range that flash point is determined. A correlation exists between the 5% point in the boiling range and the flashpoint. The lighter the products, the lower the flashpoint. Thus, two oils with the same viscosity (50% point) may have different flash points depending on the shape of the distillation curve at low temperatures.

Advantage of DLCL T oils

  • Work stable
  • GOTS approved
  • For various application and influences
  • High mechanical load capacity
  • Excellent lubrication critical conditions.
  • Excellent scour ability-readily scoured from fabrics
  • Powerful anti wear performance
  • Good high temperature stability
  • Corrosion resistance
  • Good storage stability
  • Grade tested by Du point for compatibility with lycra
  • Low fiction
  • Compatibility with electronic actualors,seals and plastic components
  • Wide operating temperature rang
  • Formulated to meet requirements of ECO labels
  • DLCL knitting oils first time an independent manufacturer of Bangladesh.

CORROSION

NS30 (Nynas) T22 (Nynas) SN150
Volatile acid, mg KOH/g 0.11 0.04 5.7
Soluble acid, mg KOH/g .43 0.47 2.2s
Sludge, % 0.18 0.28 0.72
Total oxidation products, % 0.35 0.45 3.5
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The viscosity of an oil is important for its cooling and lubricity properties. The lower the viscosity, the better the cooling. An increase in temperature reduces the viscosity. The rate of change in viscosity with temperature can be expressed in terms of viscosity index (VI). A small reduction in viscosity coupled with a large temperature changes indicates a high viscosity index.

DENSITY

It is at the low temperature area of the boiling range that flash point is determined. A correlation exists between the 5% point in the boiling range and the flashpoint. The lighter the products, the lower the flashpoint. Thus, two oils with the same viscosity (50% point) may have different flash points depending on the shape of the distillation curve at low temperatures.

Oil additives

    The choice of additives incorporated in oils is critical. Additives are used to:

  1. Modify the frictional properties of the oil
  2. Give improved anti-wear performance
  3. Give improved oxidation resistance and stability to high running temperatures
  4. Ensure corrosion resistance

The needle oil has to be compatible with the machine components The needle oil should have good compatibility with electronic and plastic components, electrical cabling, elastomeric seals and machine paints.