This is the "prepared-core" tool, whereby a stone core was elaborately shaped until a single blow, perhaps with a hammer made of a "soft" material such as bone, would detach a virtually finished tool with a continuous cutting surface around its periphery.
In order to avoid this, either the stopper or the walls of the hole, or both, must be made of a soft material such as silicone, so that the stopper can block the outflow of liquid even in the presence of sediments.
The hammer must be made of a soft material such as wood to prevent damage to the chisel.
The SPM system not only achieved a soft material sample such as cell surface information using SICM, but it also obtained mechanical properties of a sample using AFM.
Sandpaper should not be able to scratch sapphire screens, as silica is a softer material than sapphire.
One of the ultra-precision machining methods was adapted for brittle material as well as soft material by using multi-arrayed diamond tips and high speed spindle.
Seal, in documentation, an impression made by the impact of a hard engraved surface on a softer material such as wax or clay, producing a device in relief.
A sealing is the impression made by the impact of a hard engraved surface on a softer material, such as clay or wax, once used to authenticate documents in the manner of a signature today; the word seal (Latin sigillum; old French scel) refers either to the matrix (or die) or to the impression.
