The highly polished carbon planchets have a smooth, virtually mirror finish on one side with a surface roughness of 0.05 to 0.01um. The material for the cabon discs is spectroscopically pure carbon Grade 1 (soft graphite) with total impurities equal to or less than 2ppm with each single element 1ppm or less. Properties same as Carbon Planchets above. The polished planchets are 1.4 to 1.5mm (0.55" to 0.06") thick. Available in the popular 12.7mm (1/2") and 25.4mm (1") diameter.
16500-P - Highly Polished Carbon Planchets, 12.7mm diameter
16510-P - Highly Polished Carbon Planchets, 25.4mm diameter