Outgassing characteristics of POCO graphite coated with TiC by chemical vapor deposition are reported. Results obtained from fully TiC‐coated samples showed that the coating layers are not completely gas tight. The air included in the porous part of the graphite was gradually released at an outgassing rate on the order of 10−10Torr⋅l/s⋅cm2. After exposing a part of the graphite surface, the outgassing rate was reduced to the order of 10−12Torr⋅l/s⋅cm2, after vacuum baking at 250 °C for 24 h.