Labcon tips are manufactured robotically to eliminate contamination. Every lot of tips produced is tested on the pipettes they are intended for, ensuring they fit and perform correctly. The resin used for tips is pretested before use to determine its extractables profile. Resins that have high levels of residue in the 240 to 310 nm range are excluded from use. Aerosol filters are tested for endotoxin contaminants using a Chromogenic Assay U.S.P. testing method. All batches of product are tested for presence of nuclease (Rnase and Dnase) using an electrophoresis gel method after final packaging. A reaction test is run to certify there is no human DNA on these tips.