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Lapping Films

Metallographic lapping films

Diamond, Silicon Carbide and Alumina Lapping Films


LAPPING FILMS Metallographic lapping films

 

 

 

 

 

The applications for lapping films range from polishing semiconductor dies, fiber optics, optical components, ceramic capacitors, computer hard drive read-write heads, ceramic seals, etc. The main characteristic of lapping films is that they produce very flat surfaces, especially across materials with a wide range in hardness.

Lapping films consist of a polyester backing (typically 3 mils) on which the abrasive is rigidly fixed with an epoxy binder. The most common abrasives used for lapping films include diamond, silicon carbide, alumina and to a lesser extent ceria.


Diamond lapping films are precision coated abrasives using precisely graded diamond. A very flexible adhesive bonding agent is used which tenaciously hold the abrasive particles to the backing. This provides a tough, durable, tear-resistant abrasive plastic film which is waterproof and resistant to many solvents.

Diamond lapping films provide less polishing relief than intermediate rough polishing cloths and provide a fixed diamond grinding mode. Diamond lapping films are exceptional abrasives for preparing microelectronic materials for SEM and TEM analysis.

Silicon carbide lapping films are bonded or coated abrasive films of SiC designed so that the abrasive will have a large number of cutting points (negative abrasive rank angle). This is achieved by aligning the abrasive particles approximately normal to the backing. Note that coated abrasives are not quite coplanar, thus SiC papers produce the maximum efficiency (cut rate, stock removal and minimal damage) because new abrasive is exposed as the old abrasive breaks down.

Alumina lapping films consist of an aluminum oxide, which is a naturally occurring material (Bauxite). It exits in either the softer gamma (mohs 8) or harder alpha (mohs 9, 2000 HV) phase. Alumina abrasives are used primarily as a final polishing abrasive because of its high hardness and durability


RECOMMENDED PROCEDURES (Lapping Films) For plain backed diamond lapping films

    • Wet the flat lap plate with water or a water/ surfactant solution
    • Place the plain backed lapping film on the surface
    • Roll out or press out any entraped air bubbles
    • Apply necessary lubricant
    • Begin polishing with lower force to avoid tearing film
    • Clean specimen and film for final 10-15 seconds of polishing cycle
    • Clean and dry specimens

For PSA backed diamond lapping films

    • Place the PSA backed lapping film on the surface
    • Apply necessary lubricant
    • Begin polishing with lower force to avoid tearing film
    • Clean specimen and film for final 10-15 seconds of polishing cycle
    • Clean and dry specimens
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TROUBLE SHOOTING for LAPPING FILMS POLISHING
Symptom Cause Action

Coarse scratching

  • Swarf build-up on the lapping film
  • Use a lubricant with an appropriate surfactant
  • Tearing of pad

  • Sharp specimen edges
  • Reduce intitial applied load so that the specimen edge does not cut the film. Gradually increase pressure during the lapping operation.
  • Dispense lubricant more frequently
  • Excessive relief or edge rounding

  • PSA backing providing too much flexibility (resiliency)
  • Lapping backing plate surface is not flat
  • Use a plain backed diamond lapping film
  • Use a flat lapping surface
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    Diamond LAPPING FILMS

    Type A DIAMOND LAPPING FILMS (Plain-backed, 3 mil)

    Description
    Size (inches)
    Catalog Number
    (Plain-backed)
    Catalog Number
    (PSA backed)
     
    0.10 um Diamond Lapping Film
    Up to
    12-inches
    DA-01
    DAA-01
    Metallographic 0.01 micron diamond lapping film
    0.25 um Diamond Lapping Film
    Up to
    12-inches
    DA-025
    DAA-025
     
    0.50 um Diamond Lapping Film
    Up to
    12-inches
    DA-052
    DAA-05
    Metallographic 0.5 micron diamond lapping film
    1 um Diamond Lapping Film
    Up to
    12-inches
    DA-1
    DAA-1
    Metallographic 1 micron diamond lapping film
    3 um Diamond Lapping Film
    Up to
    12-inches
    DA-3
    DAA-3
    Metallographic 3 micron diamond lapping film
    6 um Diamond Lapping Film
    Up to
    12-inches
    DA-6
    DAA-6
    Metallographic6 micron diamond lapping film
    9 um Diamond Lapping Film
    Up to
    12-inches
    DA-9
    DAA-9
    Metallographic 9 micron diamond lapping film
    15 um Diamond Lapping Film
    Up to
    12-inches
    DA-15
    DAA-15
    Metallographic 15 micron diamond lapping film
    30 um Diamond Lapping Film
    Up to
    12-inches
    DA-30
    DAA-30
    Metallographic 30 micron diamond lapping film

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    DIAMOND LAPPING FILM LUBRICANTS

    Description
    Quanitiy (oz)
    Part Number
    32 oz Diamond Lapping Film Lube
    32
    LFL-032
    1 gallon Diamond Lapping Film Lube
    128
    LFL-128

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    Silicon Carbide LAPPING FILMS

    Silicon Carbide Grinding Films (3 mil)

    Description
    Size
    Catalog Number
    (Plain-backed)
    Catalog Number
    (PSA backed)
    1.0 um silicon carbide
    Up to
    12-inches
    SIC-001PB-3
    SIC-001PSA-3
    3.0 um silicon carbide
    Up to
    12-inches
    SIC-003PB-3
    SIC-003PSA-3
    5.0 um silicon carbide
    Up to
    12-inches
    SIC-005PB-3
    SIC-005PSA-3
    9.0 um silicon carbide
    Up to
    12-inches
    SIC-009PB-3
    SIC-009PSA-3
    12 um silicon carbide
    Up to
    12-inches
    SIC-012PB-3
    SIC-012PSA-3
    20 um silicon carbide
    Up to
    12-inches
    SIC-020PB-3
    SIC-020PSA-3
    30 um silicon carbide
    Up to
    12-inches
    SIC-030PB-3
    SIC-030PSA-3


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    Alumina LAPPING FILMS
    Metallographic alumina lapping film color chart

    Alumina Lapping Films (3 mil)

    Description
    Size
    Catalog Number
    (Plain-backed)
    Catalog Number
    (PSA backed)
    0.05 um alumina (ALO)
    Up to
    12-inches
    ALO-105PB-3
    ALO-105PSA-3
    0.30 um alumina (ALO)
    Up to
    12-inches
    ALO-103PB-3
    ALO-103PSA-3
    1.0 um alumina (ALO)
    Up to
    12-inches
    ALO-001PB-3
    ALO-001PSA-3
    3.0 um alumina (ALO)
    Up to
    12-inches
    ALO-003PB-3
    ALO-003PSA-3
    5.0 um alumina (ALO)
    Up to
    12-inches
    ALO-005PB-3
    ALO-005PSA-3
    9.0 um alumina (ALO)
    Up to
    12-inches
    ALO-009PB-3
    ALO-009PSA-3
    12 um alumina (ALO)
    Up to
    12-inches
    ALO-012PB-3
    ALO-012PSA-3
    15 um alumina (ALO)
    Up to
    12-inches
    ALO-015PB-3
    ALO-015PSA-3
    30 um alumina (ALO)
    Up to
    12-inches
    ALO-030PB-3
    ALO-030PSA-3

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