Dry lubrication made easy


The right lubricant can make the assembly of small parts considerably easier. Our lubricating waxes ensure your surfaces are dry to the touch for clean and quick working processes while protecting your components reliably against corrosion.

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

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.

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.

SOLUBILITY

The solubility properties of an oil are important in areas such as grease manufacturing. It is also important for keeping oxidation products in solution and for seal swell.

Viscosity Gravity Constant (VGC) is an indication of solubility. A high VGC value means good ability to dissolve polymers, additives and oxidation products. VGC can be calculated from density and kinematic viscosity (ASTM D 2501).

Aniline point is also a property that indicates the solubility of an oil. It is defined as the lowest temperature at which a mineral oil is completely miscible with an equal volume of aniline (ASTM D 611). The lower the aniline point, the better the solubility.

In the past, low refined oils, such as aromatic oils or distillates, were used where high solubility was needed. Due to health and safety reasons, these products are now banned in most countries. Due to sophisticated refining techniques, Nynas naphthenic oils are label-free, and yet retain low aniline scores i.e. good solubility. Nynas T-grades have the best solubility properties.

Oil VGC Aniline point,°C
XHVI 0.763 126
VHVI 0.785 110
SN150 (Paraf.) 0.818 96
SR130 (Nynas) 0.841 95
T110 (Nynas) 0.856 84

STEAM EMULASION

Some oils are exposed to water from condensation in the application, e.g.
in steam turbine oils. Depending upon the chemical composition of the formulation, a water-in-oil emulsion may form. One way of determining the non-additived oil´s ability to separate from water is to use the “steam emulsion method”, IP19/76(1988). According to this method, the time is measured that it takes for the oil to separate from the emulsion after steam injection. Highly refined naphthenic oils have better water separation properties than other oils.

Polyol-ester XHVI/VHVI(Hydrocracked) SN150(Paraf.) T22(Nynas) NS30(Nynas)
Time (s) 240 180/540 210 90 90

SOLUBILITY

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.

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

LIFE-CYCLE ANALYSIS

In order to assess the environmental impact of a product, it is necessary to perform a life-cycle analysis (LCA). This serves to identify all potential sources of environmental impact: from sourcing and transport of the raw material, through production and distribution, to use and final destruction.

A life-cycle analysis examines the environmental impact of a system throughout its entire life-time. Note that the reference is to a system performing a certain function, not to a product.

A life-cycle analysis should involve some kind of comparison between two systems, or parts of systems, if it is to be meaningful. The different environmental impacts can then be evaluated, given different numerical values and the two totals for all the environmental impacts of the two systems could then be compared. However, there is not yet any universally accepted standard for evaluating impact on the environment.

Nynas have not yet decided in favour of any particular evaluation method but have in the case of transformer oils used the Swedish EPS system. Here, the environmental impact is calculated in terms of Environmental Load Units (ELUs).

More information about health and safety issues can be found in the Nynas booklet “Health and safety aspects of naphthenic oil”.

Factory Images

The advanced state of development of the high grade Textile Industry Lubricants used all over the world user specific solutions benefit from this wealth of Experince. specialised needle oils available from Dutch Lube Company Limited have been formulated not only to meet the exacting requirements of todays knitting machine technology, but also to be fully compatible with the yarns and the finishing routes to which the knitted fabric is subjected.

Precision hot air oven

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