 OT: sandpaper designations, have they changed? |
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| 914 RZ-1 |
 Jul 31 2018, 04:56 PM
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Porsche Padawan  Group: Members Posts: 683 Joined: 17-December 14 From: Santa Clarita, CA Member No.: 18,230 Region Association: Southern California  |
Lately, I've seen sandpaper grits with a P in front of them. I used to just get, say, 400 grit. Now, there is P400. Are they the same? I looked it up and Wikipedia had some chart comparing grits with a "P" and ones without. It stated that one designation is US (without the "P") and the other is Euro/ISO (has a "P" in front).
It seems that all the sandpaper I've seen has a P in front of it. Did we switch over? Even stuff sold as "400 grit" says P400. They are not the same, according to the chart; P400 is closer to 320. I'm wet-sanding my car and I'm using what I think is 800, but it has "P800" on the back. P800 is similar to 400. Anybody got any insight? |
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Jul 31 2018, 05:09 PM
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can't remember Group: Members Posts: 3,172 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest 
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QUOTE(914 RZ-1 @ Jul 31 2018, 02:56 PM)  Lately, I've seen sandpaper grits with a P in front of them. I used to just get, say, 400 grit. Now, there is P400. Are they the same? I looked it up and Wikipedia had some chart comparing grits with a "P" and ones without. It stated that one designation is US (without the "P") and the other is Euro/ISO (has a "P" in front). It seems that all the sandpaper I've seen has a P in front of it. Did we switch over? Even stuff sold as "400 grit" says P400. They are not the same, according to the chart; P400 is closer to 320. I'm wet-sanding my car and I'm using what I think is 800, but it has "P800" on the back. P800 is similar to 400. Anybody got any insight? I am not certain the exact relationship, but the abbreviated story is that they are sort of similar. My impression with p320 (one I use a lot) being it is similar to 400 grit but a bit more aggressive. One thing I have found is that in many cases the sand paper wears out so quickly that walking from coarse to fine in succession is almost always worthwhile: the grit goes dull real fast. |
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Posts in this topic
914 RZ-1 OT: sandpaper designations Jul 31 2018, 04:56 PM
burton73 Made in America paper is good. Made in China not s... Jul 31 2018, 05:09 PM 914 RZ-1 Here's the chart:
At the higher numbers, th... Jul 31 2018, 05:25 PM
The Cabinetmaker The p denotes the euro standard for sandpaper. FEP... Jul 31 2018, 05:40 PM |
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