NanoFinish Corporation
Data Storage - Lapping Plate Lubricants

Data Storage Lapping Lubricants


Lapping lubricants for MR and GMR thin film magnetic heads must be capable of reducing pole-tip and alumina recession while eliminating the corrosion of exotic alloys. An ideal lapping lubricant for MR and GMR magnetic heads should be enviromentally safe, ehance the performance of the lapping surface and easily cleaned with conventional polar solvents or water based cleaning solutions.

  • Higher lapping rates (3-5X)
  • Greater lapping machines throughput
  • Evironmentally safe, non hazardous waste material
  • Longer plate life (10-50X)
  • More consistent lapping performance
  • Reduced lapping costs

    Lapping lubricants for magnetic sliders can dramatically affect surface finish, PTR, smearing, sensor corrosion, lapping removal rates and the lapping plate life. The ideal lapping lubricant is easy to clean as well as it provides a cleaning action to either the lapping plate or the lapping film surface.


    Plate Cleaning

    Cut rate Enhancer

    Contains organic corrosion inhibitor

    Rough Lapping

    Finish Lapping

    Environmentally friendly




    DIALUBE 3000

    Promotes pH passivation


    DIALUBE L7500 (higher viscosity)


    Recommended Applications:



    DIALUBE 7000 -Direct lower cost replacement for ENGIS L6037 lapping lubricant.
    DIALUBE 7500 -Higher viscosity (25 cps or greater) for eliminating lapping vibration with present state of the art lapping machines used for Pico sized magnetic heads.


    -Recommended for use at the beginning of the lapping cycle.
    -Dilution with D.I. water is very effective for restoring the lapping cut rate and for prolonging the life of the lapping plate.
    -Addition to glycerin based lapping lubes has also been effective for final lapping.


    -Recommended as a replacement for the most common ethylene glycol based lubricants. Promotes higher cut rates and longer plate life with final lapping parameters similar to existing lapping lubes.

    DIALUBE 3000

    -Recommended for extending the cutting life of diamond lapping films
    -Also very effective at dispersing diamond slurries
    -Non-ethylene glycol lube for non-hazardous disposal

    DIALUBE OL-7000 -Oil based lapping lubricant for GMR and TMR rough, fine and kiss lapping

    Suspending the grinding swarf is the key to increasing cut rates and for more stable and improved lapping plate life. The basic concept is that the lubricant has a strong affinity to the grinding swarf and the lapping plate or lapping film. An additional characteristic of the lubricant is that it produces a highly charged surface coating on the lapping plate or swarf; the result is that the grinding swarf has a strong repulsion to the lapping plate and other grinding particles. This strong replusion keeps the grinding swarf from settling and packing into the grinding surface, thus keeping the diamond grinding particle open for enhanced grinding.

    DIALUBE 7000 and 7500
    The DIALUBE 7000 and 7500 lapping lubricants are ethylene glycol based lapping lubricants which are direct lower cost replacements for the Engis L6037 lubricant. The DIALUBE 7000 lubricant has similar viscosity, surface tension and contact angle or wetability characteristics the the Engis L6037 lubricant. The DIALUBE 7500 lube has similar surface tension and wetability, however has a higher viscosity which is required with the more modern Vecco Advanced Imaging lapping machines. The following Table shows a comparison table for the various DIALUBE lapping lubricants with the Engis L6037 lapping lubricants.

    The DIALUBE 9G is an environmentally safe lapping lubricant which significantly extends the lapping film life for Type B lapping films.

    DIALUBE 3000
    The DIALUBE 3000 is a specifically formulated environmentally safe alternative lapping lubricant for ethylene glycol based lubes. The DIALUBE 9G is available as a direct replacement to the DIALUBE 7000 and Engis L6037 lubes, or can be formulated with the anticorrosion additive.

    DIALUBE OL-7000
    The DIALUBE OL-7000 is a low viscosity oil-based diamond lube for lapping GMR and TMR magnetic read-write heads.

    The POLYLUBE™ H9 lapping lube is a specifically formulated cleaning lubricant for lapping GMR and TMR magnetic heads. It is also a non-ethylene glycol formulation, which is a biodegradable and environmentally safe, thus eliminating costly disposal fees. The POLYLUBE™ H9 lapping lube is an ideal lubricant for applying at the beginning of the lapping cycle to clean the swarf build-up off the lapping plate. This swarf removal increases the lapping rates by 3-5 times and significantly extends plate life. Additional improvements include: improved lapping consistency, more consistent PTR and alumina recession, less smearing and improved surface finishes.

    POLYLUBE™ H9 lapping plate cleaning lube has been demonstrated to reactivate or restore the lapping rate of tin alloy lapping plates. Figure 1 shows the effect of lapping plate cut rate as the POLYLUBE™ H9 cleaning lube was applied after the cut rate dropped below 12 micoinches per minute. Figure 1 shows that the use of POLYLUBE™ H9 increased the cut rate by as much as 80%. This cycle repeated itself and significantly increased the lapping plate performance.

    Data storage magnetic read write head lapping lubricants
    Data Storage magnetic read write head lapping lubricants

    Figure 2 shows the effect of adding the POLYLUBE™ H9 at the beginning of each lapping cycle. The result shows that lapping plate cut rate is very stable and promotes for more consistent and stable lapping.


    Characteristic DIALUBE L7000 DIALUBE
    Carrier Glycol Glycol/Glycerin Glycerin Oil Glycol
    Viscosity 12.5 cps 25 cps 12.5 cps 25 cps 25 cps
    Surface Tension 32.58 dynes/cm2   32.60 dynes/cm2 30 dynes/cm2 32.57 dynes/cm2
    Wetting Angle
    (Bi-Sn lapping plate)
    9 degrees 9 degrees 9 degrees 10 degrees 8 degress

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