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Inch, millimeter,
mesh
Size is a relative thing. We all need a yardstick
to measure things so that we both agree on a standard. What is big
to someone is medium to another. What is twelve inches to someone
is twelve inches to anyone who knows what an inch is.
Understanding the relationship between the inch, the
millimeter and the mesh is vital to quality in the crumb rubber
industry. It is important to be able to understand the differences
between these three units of measure. You must be able to operate
in all three when discussing size with anyone.
So how do you learn about size? There are some readily
available tools you can use. One such tool is the "inch
to mm to mesh" chart. A sample listing from the chart shows
sieve designations for test sieve openings expressed in inches,
millimeters and mesh. In the example shown particles that are smaller
than .111 inch or 2.80 mm in diameter, will fall through a 7 mesh
screen.
Another very useful chart is the dime
chart. This compares a magnified dime to different particle
sizes.
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