Types of Grids
Most of the grid types are available with a center and/or rim mark.
Center mark: Many grids have an asymmetrical center marking, enabling the four quadrants of the grid to be distinguished. Older grids have a ‘reverse arrow’ center marking to distinguish each half of the grid.
Rim mark: An asymmetrical mark in the rim allows for precise orientation of the grid, and aids in the identification of each side.
Handle, Rim tab: Some grid types are available with handle (Pyser, VECO) or a rim tab (Gilder) for a better handling.
All Pyser grids are approximately 15-25µm thickness, with the exception of stainless steel which is 12µm and titanium which is 15µm.
Gilder grid thickness varies with the mesh repeat. As a general guide the lower the mesh repeat, the thicker the grid (50Mesh: 25µm, +/- 5µm; 600Mesh: 6µm, +/- 2µm).
Square Mesh (available from GILDER, Pyser, VECO, (coated grids))
The huge variation in Mesh repeats. Bar/hole width change with increasing mesh repeat.
Parallel and Rectangular Mesh Grids (available from GILDER, Pyser, VECO)
Parallel bar grids are particularly useful for obtaining information from sequential ribbons of sections.
Hexagonal Mesh (available from GILDER, Pyser, VECO)
As an alternative to square mesh, hexagonal mesh grids offer a higher support factor for a given mesh repeat distance.
Aperture Grids (available from GILDER, Pyser, VECO)
Aperture grids consist of one central circular hole. The larger the aperture dimension, the thicker the grid, for maximum rigidity.
Slot Grids (available from GILDER, Pyser, VECO)
The larger the slot dimension the thicker the grid, rigidity is essential when using formvar/carbon films to avoid ‘cracking’. Molybdenum grids are especially useful in ion milling applications because of its resistance to etching.
Fine Hex Mesh Grids (available from GILDER)
Fine Hex Mesh Grids offer a very high transmission value with the additional support of a hexagonal pattern. They offer an alternative to the standard hexagonal mesh grids for use in applications where it is important that the maximum area of specimen is available for viewing in the microscope.
Fine Square Mesh Grids (available from GILDER)
Fine Square Mesh Grids have extended the range to offer solutions in applications where it is important that the maximum area of specimen is available for viewing in the microscope.
Double Folding Grids (available from GILDER, Pyser, VECO)
Double grids, offering a combination of mesh support values, are used primarily in metallurgical applications for supporting thin metal foils. Two grids are joined by a thin 'hinge', allowing one grid to be folded on top of the other, trapping the specimen between them. The grids have a curved securing tab which folds to the curvature of the doubled grid.
Finder, Coordinate, Reference Grids (Gilder, Pyser)
The Finder range of grids are useful in applications where specific areas of mesh need to be uniquely identified. These areas range from blocks of 1 to 9 grid cells, and can typically be relocated using an alphabetical and/or numerical code built into the mesh.
Special Pattern Grids
Asbestos Analysis Index Grids
Lift out Grids for FIB
Special patterns can be manufactured on request. Please contact our Tech-Team (tech@ScienceServices.eu).