Ultraviolet radiation transparent multi-assay plates

Claim 1

A mid-UV transparent microplate comprising a frame with a plurality of parallel cylinders fixed in the frame, each cylinder defining a microplate well having a top and bottom opening, the bottom opening of each cylinder being sealed without leaking for holding liquid to be analyzed, with a portion of a substantially mid-UV transparent sheet material having an optical density of less than 0.4 OD from 250 nm to 750 nm, the mid UV transparent sheet material being selected from the group consisting of polyethylene and4-methylpentene-1 based polymer, the UV transparent material being in the form of a single sheet which is bonded to the bottom of each well, the microplate being characterized by an optical density variation between microplate wells of about a maximum of 0.02 OD (250 nm to 750 nm), the maximum thickness of the bottom being about 0.020 inches and the minimum thickness being about 0.015 inches, a minimum diameter of the cylinder is about 0.18 inches, a high resistivity to organic solvents and a temperature range of 15° to 45° C., with no optical degradation and 15° to 70° C. with no dimensional deformation, whereby said microplate will permit an accurate mid-UV light absorbance measurement of the liquid being analyzed.