1907 E FM 407  Argyle TX  76226-9447   T: 940-455-2269   F: 940-455-7385

Technical Information

Surface Footage Chart
The following chart calculates the SFPM of any given diameter wheel at the most common speeds (measured in RPM). Whether you are using a sanding belt, sanding disc, buffing wheel, grinding wheel or any type of wheel to produce your finish, you need to know the speed at the outside diameter or (periphery) of said wheel. It is the speed at the outside diameter of a wheel (measured in surface feet per minute) that determines your success not the RPM of the spindle in the middle of the wheel. The formula for calculating any SFPM is given at the bottom of the chart.

Click here to download the chart. It is in adobe pdf format.


Grit Comparison Chart 
The following chart compares the various coated abrasive products produced around the world. Most people do not realize that different manufacturers and countries grade their abrasives very differently. The US grading system in the first column on the left is the basis for all US Architectural specification numbers such as # 3, #4, #7 & #8. The chart uses this US grade as the base and compares all the other types of products to it. The most startling difference occurs in the European P Grade where the grits above P180 really do not get much finer as compared to either the US grit rated products or the micron rated products of the 3M™ Trizact™. Whether you need a coarse or fine product, you need the chart to make an informed decision as which product will be the best one to use.

Click here to download the chart. It is in adobe pdf format.

3M ROLOC™ Button Color Code Chart
The following chart shows the color code of the Roloc™ buttons for all of 3M’S abrasives. The chart was created primarily to show the color code for the 3M Trizact discs. All the Trizact discs look the same so you need to reference this color code chart to know which disc you are using.

Click here to download the chart. It is in adobe pdf format.