Abstract: The invention relates to the field of analytical chemistry, in particular to multi-well assay plates having a unique flatness for use in high throughput (bio)chemical and biological assays which rely on luminescence detection. Provided is a multi-well assay plate a top layer including walls defining a plurality of adjacent sample wells for receiving assay samples, and a bottom layer defining the bottom of the wells, having a bottom surface facing away from the wells and wherein said bottom surface is provided with a grid structure forming a plurality of mock wells at the plate bottom, characterized in that the total volume of the mock wells is less than the total volume of the sample wells.

Abstract: A method for manufacturing a plastic object may include the steps of: (a) providing an injection moulding device with a mould that includes two mould parts which in a closed position define a mould cavity; (b) providing foaming means for causing foaming in the mould cavity of plastic injected into the mould cavity; (c) providing blocking means for temporarily rendering the foaming means effectively inactive; (d) energizing the blocking means; (e) choosing as plastic a mixture of two plastics, wherein the first plastic is a non-type A plastic and the second plastic is a type A plastic that constitutes a maximum of roughly 30 percent by mass of the mixture, wherein the type A plastic is a plastic with high melt strength compatible with the first plastic, for instance HMS PP which is high-melt-strength polypropylene; (f) causing a formed object to cool to a chosen temperature, opening the mould cavity and removing the cooled object.