Easy to pleat; different levels of filtration efficiencies from 45% to HEPA, tested on TSI-8130,0.3um NaCl and muchlow resistanc Easy to pleat; different levels of filtration efficiencies from 45% to 95%, 99.97%; tested by TSI-8110, 8130, 0.3um NaCl and low resistance; can be customized according to clients' requests. Laminated & Pleated Filter Media