Our Qualitative Filter Paper works great for any filtering purpose with an ash content of ≤0.15%. Don't break the bank with expensive filters, get filtering at an affordable price.  QUAL-S SpecificationsClassificationQualitativeParticle Retention1-3µm (micron)Flow RateSlowAsh Content≤0.15%QuantityPack of 100SizeVarious Micron Filter Paper is not Returnable  For Technical Support, Questions, or Other Issues Please Email or Call Us!