With decades of consistent, dependable printing, dry-electrophotographic (DEP) printing has become known for reliable, long-lasting performance. However, poor choice of papers to run through these DEP printers might negate the benefits of DEP's reliability and reduce DEP printer's life.We present a new class of media that includes a set of specifications to ensure print performance reliability and longevity on DEP printers. The key screening test controls the maximum allowable amount of large filler particle size. We obtained an excellent correlation between paper filler size to reliability and longevity of DEP printing.The paper filler size testing is a part of ColorLok™ quality standard and has been applied to numerous brands carrying ColorLok™. Our results show that papers following ColorLok™ quality standards ensure DEP printers to meet the designed printer-life and maintain the great print performance and reliability from DEP printing technology throughout the designed-printer life.