There are various types of microgreens, with binders, and without binders, different thickness, depending on output crop. Key is to select the coco coir mats, which are most suitable for the intended output.
Coco coir mats hydroponics
Ideal propagation is achieved with e.g. coco mats, vs. palm mats, due different salt content.
For example, rather “fluffy” coco coir mats, are more optimal for easy root penetration, which lets the microgreen crop grow more freely and nicely throughout the material, fully naturally.