HIGH VISCOUS FLUIDS

With viscosities ranging from 10, 000 to 20, 000 cSt, BECHEM’s range of high viscous fluids are developed for heavily loaded applications such as gears and journal bearings. The fluids are adhesive in nature and naturally form a thick lubricating film between contact partners even under extreme loads.

BECHEM’s Berugear range of high viscous fluids possess excellent EP properties proven with ‘Four Ball’ weld load readings of above 8000 N.   The transparent clear nature of the fluid helps Maintenance Teams in gear inspection as well as in monitoring equipment health. Recommended for heavy duty applications in Cement, Steel, Power, Paper, Sugar, Chemical, Fertilizer, and Metal Processing Industries.

HIGH VISCOUS FLUIDS

Advanced range of high viscous service lubricant that is devoid of solid lubricants and can be applied by spraying or dipping systems. Offering superior wear resistance, Berugear HV series are extremely adhesive and form pressure resistant film that do not harden or break. The bitumen and heavy metal free lubricant reduces consumption and extends lubrication intervals. Available in varying base oil viscosities.

Applications: Berugear HV series are recommended for open gear drives of ball mills, rotary kilns, rotary barrel mixers and dryers with high width to diameter ratio. Please consult a BECHEM Application Engineer for selection of the suitable grade of ‘Berugear HV’ series for your application.

ProductBase oilViscosity [mm2/s] at 40 °CFour ball test weld load (N)Send Your Queries
Berugear HV 10

  • High loads
  • Noise damping
  • open gears
  • Plain bearings
Mineral oil/Synthetic oil10,000≥ 8000
ProductBase OilViscosity [mm2/s] at 40 °CFour ball test weld load (N)Send Your Queries
Berugear HV 20

  • High loads
  • Noise damping
  • open gears
  • Plain bearings
Mineral oil/Synthetic oil18,500≥ 8000

FREQUENTLY ASKED QUESTIONS

The measure of consistency is called penetration. Penetration depends on whether the consistency has been altered by working. Standard test procedures established by American Society for Testing and Materials International (ASTM) and accepted by industry are ASTM D 217 and D 1403, measure penetration of unworked and worked greases.

The NLGI has established consistency numbers ranging from 000 to 6, corresponding to specified ranges of penetration distance of the standard cone into the test grease. Table below lists the NLGI grease classifications along with a description of the consistency of each classification.

NLGI number
ASTM worked (60 strokes) penetration at 25 °C
tenths of a millimetre
Appearance
0445-475fluid
0400-430semi-fluid
0355-385very soft
1310-340soft
2265-295“normal” grease
3220-250firm
4175-205very firm
5130-160hard
685-115very hard

The most important feature of a grease is its consistency. A grease that is too stiff may not get pumped into areas requiring lubrication. While a grease that is too fluid may leak out. Grease consistency depends on the type and amount of thickener used and the viscosity of its base oil. A grease consistency is its resistance to deformation by an applied force.

Greases are made by mixing a solid material, called a thickener, with a base oil and property enhancing additives; but it’s the oil that forms the lubrication film. For better understanding, grease thickener can be thought of as a sponge saturated with oil. Moving parts squeeze the oil out of the sponge like thickener for forming the lubrication film. Typically, the base oil constitutes the largest proportion of grease weight at about 80-90%, followed by thickener at 10 to 20% and additives under 10%.

Dropping point of a lubricating grease is an indicator of the heat resistance of the grease. and is the temperature at which the grease is no more a thickened lubricating medium. The dropping point indicates the upper temperature limit at which a grease retains its structure, not the maximum temperature at which a grease may be used.

Few greases have the ability to regain their original structure after cooling down from the dropping point.

Ideally, de mineralized (DM) water with neutral pH of 7 and hardness less than 50 ppm is recommended. The chloride level should be less than 25 ppm with no bacterial and fungal presence. Usage of hard water leads to increased conductivity, hence poor rust protection and lower sump life.

Viscosity: It is a measure of resistance to flow of a lubricating oil.

Viscosity index: It is defined as rate of change of viscosity with respect to temperature.

Significance:

  • It is the most important property which determines the performance of lubricating oils under the influence of temperature
  • A lubricating oil should have sufficient viscosity to retain a lubricating film on the surface
  • On machine part moving at slow speeds under high pressures, a high viscous oil should be used as it better resists being squeezed out from between the rubbing parts.  Light oils can be used for lower pressures and high speeds.
  • It is not possible to maintain a liquid oil film between two moving or sliding surfaces if the viscosity is too low and hence excessive wear will occur.

The pour point of an oil is the minimum temperature at which the oil turns into semi solid and almost losses its flow characteristic. At low temperatures, the viscosity of the oil will be very high, causing the oil to resist flow. This is important in equipment that operates in a cold environment or handles cold fluids.