Abstract: Laboratory equipment holder to mount and position glass flasks in a simple and secure manner. The laboratory equipment holder includes of a component on which at least one holding device is attached and both the component and also the holding device and the connection between the component and holding device can be mechanically loaded with at least one filled piece of laboratory equipment, and the component includes on one of its sides at least one recess. At least the end thereof within the component is embodied in an at least semicircular manner and at least the smallest diameter of the semicircular section of the recess is smaller than the largest diameter of the truncated conical neck of the piece of laboratory equipment and/or is smaller than the largest diameter of the beaded edge-like enlargement of the neck of the piece of laboratory equipment.

Abstract: Described is a resin mixture comprising a vinyl ester resin and a co-polymerizable compound, which bears at least two methacrylate groups, some of which is replaced by an itaconic acid ester. It is possible to control the properties of the composition, such as the curing, through the selection of the itaconic acid ester. In addition and beyond this feature, it is possible to formulate resin compositions that exhibit a certain amount of bio-based carbon.