I guess Baldwin got tired of answering micron questions. I was crossing a filter on their site and noticed that under the filter specs, absolute and nominal micron rating is listed now. Pretty cool and wish more companies did this.
I thought it was 50% and 97% for some reason. No proof just stuck in my head for some reason.Below is a link to the oil filter I would use on my Subaru and I am not seeing the information you are referring to:
Also what is the exact difference in the definition of absolute and nominal ratings?
Does absolute = 99%
Does nominal = 50%
Good point, I didn’t notice that. Thanks.If you look by application no micron info. If you cross reference, it shows it. AC Delco PF64 to Baldwin B7422, 9.8 Nominal; 27 Absolute.
Try crossing a known filter number in the cross reference section and see if that helps.Below is a link to the oil filter I would use on my Subaru and I am not seeing the information you are referring to:
Also what is the exact difference in the definition of absolute and nominal ratings?
Does absolute = 99%
Does nominal = 50%
Even though I don't use them, that's too bad about answering inquiries. CS used to be fairly responsive. 'In my observation' while they have the appearance of a well made filter, not especially noted for high efficiency.I guess Baldwin got tired of answering micron questions. I was crossing a filter on their site and noticed that under the filter specs, absolute and nominal micron rating is listed now. Pretty cool and wish more companies did this.
Try crossing a known filter number in the cross reference section and see if that helps.
There is no difference in 98.7, 99, or 99+ Imo, because at those levels statistics go to pot from the lack of particles, empty data, experimental error. 99 is merely rounding 98.7, and Fram says 99+ which is extrapolating from the graph, and rounding off. One big happy make it go higher party to fool the people on the box. Then the people say o ahhh and buy the filter when it really is all marketing fluff.. But the goal of filter in Walmart’s check out line has been fulfilled. That’s competition for you.I wouldn't call 98.7% @ 27u excellent efficiency - what is it at 20u ? ... maybe 85~90%. But it's definitely better than say 50% @ 20u.
Most places in the filter industry define "absolute efficiency" at 98.7 % (and sometimes round it to 99%) and "nominal efficiency" at 50%.
You left out the particle size in your tome.There is no difference in 98.7, 99, or 99+ Imo, because at those levels statistics go to pot from the lack of particles, empty data, experimental error. 99 is merely rounding 98.7, and Fram says 99+ which is extrapolating from the graph, and rounding off. One big happy make it go higher party to fool the people on the box. Then the people say o ahhh and buy the filter when it really is all marketing fluff.. But the goal of filter in Walmart’s check out line has been fulfilled. That’s competition for you.
Go read ISO 4548-12 sometime and you'll then understand why it can be rounded up. Just more of you're biased misinformed trolling without leaning much of anything, lol.There is no difference in 98.7, 99, or 99+ Imo, because at those levels statistics go to pot from the lack of particles, empty data, experimental error. 99 is merely rounding 98.7, and Fram says 99+ which is extrapolating from the graph, and rounding off. One big happy make it go higher party to fool the people on the box. Then the people say o ahhh and buy the filter when it really is all marketing fluff.. But the goal of filter in Walmart’s check out line has been fulfilled. That’s competition for you.
Yes and the companies that avoid that Gold Standard aren't doing so because they are honest!Go read ISO 4548-12 sometime and you'll then understand why it can be rounded up. Just more of you're biased misinformed trolling without leaning much of anything, lol.
Guess Fram could say 98.7% efficient at 18 microns, but would rather stick with the efficiency at 20u since that seems to be kind of an industry standard target particle size to express efficiency.
Bingo ... these companies cross-check each other (the big filter companies have their own ISO testing labs), just waiting to send a letter saying stop false advertising.Yes and the companies that avoid that Gold Standard aren't doing so because the are honest!