Princeps Borosilicate Vitri Cork Lid

--High borosilicate glass (also known as hard glass) is a special glass material with

lower expansion rate, higher chemical stability/temperature resistance/strength/hardness/smoothness and transmittance.

-- So the corrosion & acid resistance of high borosilicate glass is excellent.  

-- Glass has no risk of self-explosion, 120℃ thermal shock. No shattering & cracking when alternating from freezen to hot.

--Therefore, it does not contain toxic substances, and the high temperature resistance and acid resistance of borosilicate make it difficult to precipitate harmful substances in daily use.