United's ResinPur cartridges have a unique, proprietary* two-stage filtration design to maximize particle removal and service life in viscous fluid filtration applications.  An outer spiral prefilter wrap increases cartridge strength and eliminates  residual debris associated with conventional, machined, resin-bonded cartridges.

*US Patent No. 5,639,370

• Outer spiral wrap collects large particles and agglomerates, while inner layers control particle removal at rated size.
• Outer wrap increases surface area and eliminates lose debris and contamination caused by machined products.
• Extra-long acrylic fibers provide added strength, resist breakage and migration common with competitive "short fiber" cartridges.
• Phenolic resin impregnation strengthens cartridge for use with fluid viscosities up to 15,000 SSU (3200 cks)
• Withstands pressure surges up to 150 psid across cartridge (depending on fluid temperature).
• One-piece construction eliminates bypass concerns with multi-length cartridges and eases change-out.
• Silicone-free constructions ensures no contamination to adversely affect adhesion properties of coatings.