300 mesh . Related Categories. Substrates & Prefab Electronic Components. Compare Similar Items View Full Comparison. Show Differences. 1 of 4. This Item TEM-Q250AR1.3 TEM-Q350AR13A TEM-LFH7100AR1.3; Sigma-Aldrich. TEM-Q350AR1.3-2NM. QUANTIFOIL R 1.2/1.3 with Ultra-Thin Carbon. View Price and Availability.