Originally Posted By: Gary Allan
Either that our the filtration rate that Purolator currently publishes can't be spec'd with an "open end" longevity component.
That is, even if these spec's are REAL ..they have to have some qualification to them. Like ..after a limited number of hours of usage they don't apply anymore.
I'm probably not stating this clearly. There are immutable angles to this that cannot be trumped.
Keep in mind that Purolator's 99.9% at 20 microns efficiency spec is based on ISO 4548-12 test methods ... today's standard test method used for automotive filters. The same test method is also used by many other filter manufactures ... so Purolator IS qualifying the spec through a well used test method.
There debris holding capacity testing is also qualified by ISO test methods.
Either that our the filtration rate that Purolator currently publishes can't be spec'd with an "open end" longevity component.
That is, even if these spec's are REAL ..they have to have some qualification to them. Like ..after a limited number of hours of usage they don't apply anymore.
I'm probably not stating this clearly. There are immutable angles to this that cannot be trumped.
Keep in mind that Purolator's 99.9% at 20 microns efficiency spec is based on ISO 4548-12 test methods ... today's standard test method used for automotive filters. The same test method is also used by many other filter manufactures ... so Purolator IS qualifying the spec through a well used test method.
There debris holding capacity testing is also qualified by ISO test methods.