The capillary methods are widely applied to control products made of non-magnetic, non-metallic, composite and other advanced materials, and in most cases these methods are considered to be the only available techniques. The article considers options for manufacturing non metallic check samples for penetrant testing in terms of several cracks performed on one and the same sample and corresponding to different classes of sensitivity. The basis was a non-metallic material, an epoxy adhesive, and the defects were made by etching foil. Such samples are easy to manufacture, the defects performed are of desired parameters. This increases the actual output of the final product, the material is not exposed to corrosion, and the quality of sample cleaning increases as they are practically transparent.