Performance LubricantsCorrugator Conversion

Technical Information
Read these tips first before converting from oil lubrication
to Krytox™ grease lubrication.
Before you proceed with this conversion, it is critical thatyou determine that the bearings have sufficient internal
clearance. Contact your equipment manufacturer forengineering guidance.
Bearings that are grease lubricated have a higher
differential temperature across the bearing than oil
lubricated bearings. This can cause the bearing to fail if
the internal clearances are not adequate. Generally, moreclearance is needed, and a bearing with C-4 clearance canoften be used. However, each manufacturer of machinesand bearings has different specifications, and they should
be consulted to avoid problems.
Both upper and lower corrugating roll bearings andpressure roll bearings can be converted to Krytox™ grease.
Preheater and preconditioner roll bearings can also beconverted. Some older models need thrust bearingson the lower preheater before conversion can be done.
Contact your Krytox™ representative or equipment
manufacturer for guidance. Any other bearings in hightemperature service can also be converted to Krytox™.
The best time to convert to Krytox™ is at a corrugator rollchange when you will be replacing the bearings. This isalso the most convenient time to clean out the bearing
housings.
Pack the new bearings with Krytox™ before you put themon the shafts or into the bearing housings. Then, fill thecavity after assembly and again after the equipment has
been running “hot” for 1 hr.

Ideally, you want to push the grease into the middle of thebearing and squeeze it out through the rollers. If that’s notpossible, apply the grease on one side of the bearing andrelieve it from the other side to prevent trapped air.
For best results, the bearing housings should be sealed
on both sides. Lip seals or multiple (preferably three)close clearance labyrinth (maximum allowable clearance
between shaft and labyrinth is 0.010 in) seals may beused. If shaft to housing clearances are tight, Krytox™ will
act as a seal; but, it might not be as effective or last as
long as a regular seal.
Krytox™ will seal up uneven areas or imperfections in theseals and work for about one to four months. If there areno seals, the housing will be exposed to contaminationand more frequent relubrication will be needed. After
this time, re-grease the bearings. Add more grease until
clean grease comes out of the relief fittings. You can
expect to use about half the amount you needed forthe original application, or one-half the cartridge, when
you relubricate. Rotate the roll to evenly distribute thegrease in the bearing. If you are not using a buttonhead or pin type grease fitting, change to this style toprevent inadvertent mixing of Krytox™ with a hydrocarbon
oil-based grease. Use a dedicated grease gun with amatching fitting.
Keep all Krytox™ grease containers covered to avoid
contamination while in storage and clearly label them.

Krytox™

Performance LubricantsSingle Facer Bearing Packing Procedure

Relubrication

Solvent Degrease

For optimum results, Krytox™ should be replenished every
one to four months. An amount equal to approximately
one-half the original 100% fill volume should be used.
Rotate the roll while adding the grease to provide even
distribution in the bearing.

New bearings come with a preservative/rust preventive oilthat must be removed before greasing with Krytox™.
Flush bearing with cleaning solvent, making sure
all contaminants have been removed. An aliphatichydrocarbon safety cleaner may also be used. Do not use
a chlorinated solvent. Wipe, blow dry, heat, or rinse thebearing to remove any residue left by these alternativesolvents. See bearing cleaning procedure for additionaldetails.
Packing the Bearing
Provide a sufficient bead of grease to lubricate theinboard lip seal.
Pump grease around each roller while rotating thebearing to force out any trapped air. Continue rotating thebearing a second time while pumping grease to top off to100% fill.
Put a bead of grease on the outside of the cage to provide
a reserve and lubricate the roller ends against the cage.
Smear grease on the outside of the bearing at the sliding
fit to prevent fretting corrosion. Smear a thin film ofgrease on any self-aligning rings that may be used.

Contact your original equipment manufacturer service
representative for specific recommendations.
Additional Suggestions
O-rings can be eliminated if mating surfaces have close
sliding fits (i.e., less than 0.010 in).
Lip seals can be eliminated if mating surfaces have close
sliding fits (i.e., less than 0.010 in).
Lip seals can be replaced by multiple labyrinths (threeis preferred) with a ⅛” x ⅛” box cavity. The maximum
clearance between the shaft and the labyrinth should be0.010 in.
Change the style of grease fitting from a surface-ball
type to a button-head or pin type to ensure only Krytox™
grease is used. Use a dedicated grease gun matched tothe fitting.

After the bearing is lubed, prepare the housing for
assembly by solvent cleaning—making sure the inlet or
fill port is clean. Fill the inlet with grease to prevent any
air from being trapped inside. Lubricate the interior of thehousing for easy assembly and lubricate the “vee cavity”(garter spring cavity) of all lip seals.

The information set forth herein is furnished free of charge and based on technical data that Chemours believes to be reliable. It is intended for use by persons having technical skill, at their own
discretion and risk. The handling precaution information contained herein is given with the understanding that those using it will satisfy themselves that their particular conditions of use present
no health or safety hazards. Because conditions of product use are outside our control, Chemours makes no warranties, express or implied, and assumes no liability in connection with any useof this information. As with any material, evaluation of any compound under end-use conditions prior to specification is essential. Nothing herein is to be taken as a license to operate under or arecommendation to infringe any patents.
NO PART OF THIS MATERIAL MAY BE REPRODUCED, STORED IN A RETRIEVAL SYSTEM OR TRANSMITTED IN ANY FORM OR BY ANY MEANS ELECTRONIC, MECHANICAL, PHOTOCOPYING, RECORDING OR OTHERWISEWITHOUT THE PRIOR WRITTEN PERMISSION OF CHEMOURS.

For product information, industry applications, technical assistance, or global distributor contacts, visit krytox.com or within the U.S. and Canada, call 1-844-773-CHEM/2436 oroutside of the U.S., call 1-302-773-1000.
© 2018 The Chemours Company FC, LLC. Krytox™ and any associated logos are trademarks or copyrights of The Chemours Company FC, LLC. Chemours™ and the Chemours Logo aretrademarks of The Chemours Company.
Replaces: H-58529
C-11624 (5/18)