Carrier element for introducing a dry substance into a flow cell

A device for arranging a dry substance within a cavity of a microfluidic flow cell, the device comprising:

• a plug-like carrier element;
• and a dry substance adhered to the carrier element, wherein the carrier element is a plastic injection-molded part and the dry substance is adhered to the carrier element by heat or freeze drying, the dry substance being adhered to plastic material of the carrier element directly or via an intermediate layer, wherein the plug-like carrier element has a cylindrical or conical body with a front surface that forms a carrier surface to which the dry substance is adhered, wherein the body is configured to be insertable into a passage of the flow cell leading to the cavity so that the carrier surface with the dry substance borders the cavity, wherein the cylindrical or conical body has a lateral surface configured to close the passage in a fluid-tight manner, wherein the conical body tapers toward the carrier surface and wherein a collar is arranged at an end of the cylindrical body opposite to the carrier surface.