Single Crystal CaCO3 (100) Orientation, 10x10x0.5mm, One Side EPI Polished - CCOa101005S1 Coin Cell Battery please choose anti-corrosive vacuum gauge

please choose anti-corrosive vacuum gauge ( click pic below left 2 )

OD:    81

because it has a lapped glass surface and < flatness of +/- 2 microns

This is a pair of a smart sealing assembly for a vacuum tube furnace to seal both ends of OD 80-81 mm tube without any welding and gluing

Carbon content: 99%

Single Crystal CaCO3 (100) Orientation, 10x10x0.5mm, One Side EPI Polished - CCOa101005S1 Coin Cell Battery please choose anti-corrosive vacuum gaugeCaCO3 (Calcite) single crystal: Orientation: (100) Size: 10mmx10mmx0. 5mm Polish: one side EPI polished. Typical Properties: Crystal structure: Rhomb. a= 4. 989 Angstroms c= 17. 062 Angstroms Melting point: 1339 degree C Density: 2. 71 g cm^3 Transparency Range: 350nm 2300nm Thermal Conductivity: 4. 646 W mK for 273 K Hardness: 3 (Mohs) Ra: <5A Typical XRD ? at 32 20')