… oxygen or steam under heat. (b) Chemical Vapour Deposition (CVD) equipment , which deposit various types of films which … Operations may take place at atmospheric or low pressure (LPCVD) and may use plasma enhancement (PECVD). (c) Physical Vapour Deposition (PVD) equipment , …
… produced using the Chemical Vapour Deposition method (CVD), on the contrary, are mostly square or rectangular in … diamonds may be produced using methods other than HPHT and CVD. (B) Reconstructed precious and semi-precious stones …
… in (1) to (4) above. The principal types are : (a) CV (constant viscosity) rubber and LV (low viscosity) rubber . CV rubber is obtained by adding a very small quantity …
