These surfaces are made up of materials that have no “holes” through which air or liquid can move. There is no diameter by which to judge the porosity of these surfaces as they have no holes whatsoever. These types of materials include hard plastics, metals, and glass. Similar to porous surfaces, the substrate of these nonporous surfaces will be used to determine the type of ink required.
Once the porosity or lack thereof is determined, you will be able to make plans concerning the appearance of the already finished printed image on the substrate. A general rule of thumb in the application is that a surface that has a coarse texture will produce a low-resolution image, while a surface that has a smooth texture will produce a high-resolution image.
It is important to note that if the printed image is of the desired resolution, then, the process of distributing the materials, printing warning labels, and handling materials and much more would be done properly and correctly.
An example of inks that can be used to print on non-porous surfaces includes the yellow quick drying ink. This ink can be applied to make durable marks on non-porous surfaces such as glass, metal, plastic and other surfaces, as it dries quickly.