There is the toughened glass also used for high voltage, but for your porcelain is very common the materials little bit idea you have to have for insulating materials.
कडक काच देखील हाय व्होल्टेजसाठी वापरला जातो, परंतु साधारणपणे इन्सुलेट मटेरियल साठी पोर्सिलेनच वापरले जाते.