The most important functional consideration for work surfaces is the RTG resistance from the top of the surface to the groundable point. ANSI / ESD S20.20 Table 1 recommends a requirement of less than 1 x 10E9 ohms. If Charged Device Model damage is a concern then setting a lower resistance limit should be considered. Typically, 1 x 10E6 ohms. Durability factors that should be considered are hardness, abrasion resistance, tear resistance, etc. Work surfaces may require special heat resistant materials. Light reflection may be an important ergonomic consideration.