Discussion
Which of the following cast materials is popular to reproduce the striation marks ?
Answer: C
The popular material is liquid silicone rubber.
Striation marks, such as those left by a tool blade, are very fine scratches. Silicone rubber casting compounds (Mikrosil is a common one) flow into the finest detail, set quickly at room temperature, release cleanly from the surface without damaging it, and do not shrink, so the cast can be compared with test marks under a comparison microscope.
Plaster of Paris and dental plaster are for large three-dimensional impressions such as footwear and tyre marks and do not reproduce microscopic striations. Sulphur is used for casting impressions in snow and is too coarse for tool-mark detail.
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