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Roll neck bearing requires a lubrication condition under so-called high PV range since sliding condition between a roller end surface and the flange section of an inner race is very severe.

PALMAX RBG is able to control oil separation through temperature conditions. Providing a function similar to oil lubrication, it contributes to extend service life of a bearing operating at high velocity or high-V. Suitable for sealed bearings operating at high velocity.

Characteristics of Palmax RBG
1.Lubricity
Having properties of oil separation and return, the grease has performance similar to oil lubrication and is suitable for bearings with high PV.
2.High in adhesion
Its high adhesion to bearings restrains the grease from spattering and prevents failure in lubrication of bearings caused by grease loss.
3.Water resistance
Excellent shear stability in the presence of water prevents failure in lubrication of bearings caused by grease softening and leakage.
4.Rust prevention
Even in the presence of industrial water, the grease offers excellent rust-preventive property and prevents bearings from being damaged by 

Main applications and applicable components
Roll neck bearings of rolling equipment

Typical Property

Lubricity (Property similar to oil lubrication

PALMAX RBG has a property: When temperature rises, the grease bleeds oil and when temperature drops, the free oil returns back to the grease. Owing to this property, the grease is superior in oil film forming at high temperature (high-speed, high-load), offering good lubricity.

                                     Comparison with oil release from our multipurpose EP lithium soap grease and PALMAX RBG

PV property

Test method

• Test rig: K-80 (See the picture shown below)
• Test bearing: Steep angle tapered roller bearing (Bore 80mm)
• Amount of grease filled: 500g (Bearing box volume 100%)
• Thrust loading: Gradual increase starting from 5.9kN (0.6ton)
• Rotational speed: 1193 rpm (Fixed)
• V: 1.0m/s (Fixed)
• Test method: Start the test with the condition―rotational speed 1193rpm (V = 1.0m/s), load 5.9kN { 0.6ton f } ( P = 50MP { 5.1kgf/mm2 }). Then gradually raise the load every one hour to continue the testing until the rise in temperature (ΔT) exceeds 180deg.

                                                                                            *△T = Bearing temperature − room temperature

 

 

                                                  K-80

Results of K-80 test

P, limit value by temperature (△T: Highest temperature)

Bearing Temperature

※The above values are typical properties and we cannot guarantee the applicability of this information in any individual situation. Information regarding the application and service temperature range or typical property values are provided as a guide in selecting the appropriate grease. It is recommended that the user makes its own assessment and determination of the safety and suitability of the product performance/properties for the intended purposes prior to use.

※Safety Data Sheet (SDS) of the product should be consulted prior to the use.

※The information contained herein is subject to change without notice.

※All images used are for illustrative purposes only. (excluding test results).