Microvolume crosses have a unique two-piece design which allows an extremely small bore in a conventional ferrule and nut fitting. The actual connection area is separated from the nut threads, with the ferrule detail in a metal or polymer insert and the threads machined into a stainless Steel or PEEK ring.Inserts are made of stainless Steel, Hastelloy C, Titanium, PEEK, or CTFE. PEEK rings are not usable above 75°C. The stainless Steel ring with a metal insert can operate at up to 10,000 psi for HPLC or SFC.All standard Valco zero dead volume reducing ferrules (ZRF, FS, and FSR) will work in these fittings. The unions in the table below include ring, insert, nuts, and ferrules. The ferrules are the same material as the insert. Nuts are stainless with metal inserts, and PEEK with polymer inserts.
