Mylar Abrasive Grades

[Mr Ink]

Mylar sheets appear to be the preferred abrasive for smoothing nibs. Their abrasive grade is sometimes quoted in "microns" (e.g. 0.3 micron), and in "grit size" (e.g. 9000 grit) at other times. Can somebody please explain how to convert one measurement into the other? Some kind of table would be very helpful.

[freehand]

If you have some that are labelled with both microns and the grit size, the difference should be easy to calculate. Sometimes catalogue listings will have the micron size while the actual abrasive sheets tend to have the grit size stamped on the backs.

[FarmBoy]

Mylar sheets appear to be the preferred abrasive for smoothing nibs. Their abrasive grade is sometimes quoted in "microns" (e.g. 0.3 micron), and in "grit size" (e.g. 9000 grit) at other times. Can somebody please explain how to convert one measurement into the other? Some kind of table would be very helpful.

Ask Jeff.

[Mr Ink]

If you have some that are labelled with both microns and the grit size, the difference should be easy to calculate. Sometimes catalogue listings will have the micron size while the actual abrasive sheets tend to have the grit size stamped on the backs.

 

Sadly, I do not have any sheets that are labelled with both types of measurement. That is why I'm asking the question.

[Basset]

If you have some that are labelled with both microns and the grit size, the difference should be easy to calculate. Sometimes catalogue listings will have the micron size while the actual abrasive sheets tend to have the grit size stamped on the backs.

 

Sadly, I do not have any sheets that are labelled with both types of measurement. That is why I'm asking the question.

 

I have 3M mylar lapping sheets that designate 1 micron as 8,000 grit and 0.3 micron as 18,000 grit. See here for other micron / grit sizes. By the way, I just used the 1 and 0.3 micron to smooth out an italic grind I did on a Lady Patricia and the results seem quite nice.

[Mr Ink]

I have 3M mylar lapping sheets that designate 1 micron as 8,000 grit and 0.3 micron as 18,000 grit. See here for other micron / grit sizes. By the way, I just used the 1 and 0.3 micron to smooth out an italic grind I did on a Lady Patricia and the results seem quite nice.

 

Thanks very much, Basset; that's exactly what I needed.

[Bart]

(oops; moved my post to the right thread)

Edited June 30, 2010 by Bart