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Lubricants

Delivering of lubricants

The delivering of lubricant is influenced by many different factors.
  • One of the most important ones is the penetration (consistency). The higher the penetration NLGI-Class the stiffer the lubricant. Generally spoken: stiffer lubricant (grease) can not be pumped that easily. NLGI-Class 000 is the lowest class, i.e. the softest lubricant, NLGI-Class 6 is the stiffest, viscousest lubricant.

  • Lubricants up to NLGI-Class 2 can be normally therefore the pumped without any problems.

  • Most of the used lubricants correspond with the NLGI-Class 2.

  • NLGI - Class = Rating of the lubricants, which is done by the National Lubricating Grease Institute.

NLGI-Class

Walkpenetration acc. DIN ISO 2137
Unit = 0.10 mm

000

445 up to 475

00

400 up to 430

0

355 up to 385

1

310 up to 340

2

265 up to 295

3

265 up to 295

4

175 up to 205

5

130 up to 160

6

85 up to 115

  • The apparent dynamical viscosity, which is provided by certain manufacturers of lubricants, has an important meaning. If it goes beyond 5000 m Pa.s, pumping with conventional lubricant pumps or systems is complicated or not even possible.

  • At the same time the surrounding temperature as well as the length of the conduits or hoses is also important.

  • Synthetic or Bio-lubricants can affect the seal materials.

  • If the solid content parts in the lubricant are too big, the pumping of such lubricant can be impossible with a conventional pump.

  • Do not confuse silicone grease with silicone used for sealing (no lubricant).