SPI Supplies

EMicron™ Asbestos Index Grids

One of the world's leading grids for TEM asbestos work and quantitative electron microscopy


Chinese




This highly popular EMicron™ Brand TEM Asbestos Index Grid, featuring a "thick/thin" grid bar design, is in use in many of the world's busiest asbestos testing laboratories world wide. In this case the indexing is directly adjacent to each grid square but in that case, the total number of grid squares available for analysis, relative to the SPI Asbestos Index Grid, is cut roughly in half.

We do want to stress that this is the original EMicron asbestos index grid, with the perfectly smooth grid bars and the highly reproducible area, grid square to grid square.

Critical dimensions:
Diameter:   3 mm
Thickness:  0.4 mils / 10  µm
                                                             
Grid bar widths:
          Thick:  35 µm  ± 5%
          Thin :  21 µm  ± 5%

  • Parallelism of the grid bars:

    • We can not measure any deviation at the low magnification light microscope level.

  • Dimension details about the pattern:

    • Width of the bars (e.g. lines) of the letters is roughly 14 µm, but it depends on the specific letter or number, and it does vary. But 14 µm is an "average" figure. Check out these features that have made these 200 mesh grids popular in my high volume TEM asbestos testing laboratories:

  • Alpha numeric indexing right next to the grid square being used:
    Makes it even easier to identify and relocate specific grid squares for the mandated verification counting.


  • Grid squares are indeed square:
    Consistent (almost imperceptible standard deviation) from square to square on all grids within a given batch. SPI uses its own SPI-Quant™ image analysis system to confirm that batch to batch, even grid to grid, variation is within our specifications. Also available are these same grids "precalibrated" according to US EPA (Environmental Protection Agency) and NVLAP (National Voluntary Laboratory Accreditation Program) requirements; such shipments are accompanied by the quantitative report on the square to square standard deviation.


  • Special "V" shaped notch on the rim:
    Helps ensure that you always reinsert (for verification counting) the grid into the microscope using the same identical orientation. However this does not show you whether you have inserted the grid right side up. This is determined by the dull vs shinny side discrimination. If this is not sufficient for your own personal preferences, then we would recommend instead the SPI Asbestos Index Grid which has the asymmetric "SPI" in the rim.


  • Metal selection:
    Select from copper or nickel. For normal kinds of work, we would recommend copper although some analysts have expressed a preference for the stiffer physical properties of nickel.


  • Standard deviation of the area, square to squarer:
    While not guaranteed, virtually all batches run better than 5%.

    • SPI #EachIn Stock
    Index Grid, copper, "200 mesh"
    Each vial (100 grids)
    		3270C-XA  $24.35 Add to cartYes
    Pkg (10 vials)
    		3270C-XB  198.63 Add to cartNo
    Pkg (100 vials)
    		3270C-XC1822.55 Add to cartNo


    Index Grid, nickel, "200 mesh"
    Each vial (100 grids)
    		3270N-XA  $30.51 Add to cartYes
    Pkg (10 vials)
    		3270N-XB  254.28 Add to cartNo
    Pkg (100 vials)
    		3270N-XC2340.55 Add to cartNo

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    Tuesday May 13, 2008
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