Is it safe to pour boiling water into a glass jar?
Based on 1 peer-reviewed studykitchen
Verdict: Safer
If the jar is tempered glass or heatproof glass, yes. Regular glass may crack.
What's actually in it
Tempered glass (Pyrex, borosilicate) handles boiling water without cracking. Ordinary thin glass (like a recycled pickle jar) can crack from thermal shock. A cracked glass full of boiling water is a burn hazard.
What the research says
Glass doesn't chemically leach. The issue is purely physical. A 2025 study on hot water in plastic shows why glass stays the safer pick for boiling liquids.
For hot liquids, use Pyrex or borosilicate glass. Always preheat a glass container with warm water before pouring boiling water in. Save thin glass for cold storage.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Release of Nanoplastics from Polypropylene Food Containers. | J Agric Food Chem | 2025 |
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