Abrasive Grain Technology and Friability

industry is called friability and that is a major term in our industry so what that means is you're all abrasive grains start out sharp because they're electrostatic coated so when they're coated that that electrostatic actually the grains come in on the bottom and they flip up and stick to the resin on the top but because electrostatic coating you're getting the heavy side of that flipping up so you always have a sharp tip but where we really I think Excel is we focus on wood 75 of our businesses would so we have some very special grains so a lot of companies will use a brown aluminum oxide because when that crack that tip cracks it's going to dull and that's really good for metal you get better life and it does okay on wood nothing wrong with it does okay we want our grains constantly once that tip cracks we want it to resharpen into two new cutting tools so even on our aluminum oxides like that one you have in your hand is a brown AO so when we start coding for for products like filmtech and echostorm we're using aluminum oxides that all this stuff's made in the lab nothing's mined anymore so we have them manufactured for us where they're they're more brittle and more friable so if we're going to use an 80 grit we want a brown aluminum oxide because we just want to cut something down we're not worried about the Finish when we start getting our finished grits which we consider 150 and above we start using pink and white aluminum oxides and they act a more a lot more like a silica carbide silicon carbide by by nature is extremely hard but it's extremely brittle and you want that because if you're sanding a seal coat you don't want to sand through so you want that cutting tool to crack really easily and we've done that with aluminum oxide that's where econ which is our brand of paper which you know you need is the owner of echamat that's