Will a mason jar shatter if I pour hot water in it?

Will a mason jar shatter if I pour hot water in it?

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0 thoughts on “Will a mason jar shatter if I pour hot water in it?”

  1. Yes , this can happen if you pour boiling water into a mason jar quickly. It is especially likely if the jar is on a hard surface such as a stove top. To avoid this, I recommend putting the mason jar on a trivet. Start by pouring no more than an inch of water in, wait a few seconds, then pour the rest.
    Also, if you can find “Kerr” brand jars they more resistant to thermal shattering than “Ball” brand. I have no idea why the Kerr jars are more resistant to sudden temperature changes, but I assume it has something to do with the composition of the glass and/or the way the jars are cast.

  2. It probaby will if the temperature of the glass is very cold . It used to be when I was a child that when making home made jams or chutneys that the jars were pre warmed in an oven first before putting the hot ingredients in otherwise they were liable to cracking . A lot of cookware these days is shatter proof because of that But I doubt if jars are .

  3. Glass, like most brittle materials, can shatter when it changes temperature abruptly. Tempered or not you can shatter a mason jar if you try. And you can have it not shatter if you are trying to keep it intact.
    If the change in temperature is “too abrupt” it will shatter. If the change in temperature is gradual the jar will remain intact.
    If you remove a jar from the freezer and pour boiling water in it will shatter
    If you remove a hat jar from the dish washer and pour hot water in, it will not chatter.
    The stress the Jar experiences is proportional to the change in temperature it is undergoing. When the stress is too high, the glass shatters.
    Thats the answer. The following is the scientific explanation:

    Will a mason jar shatter if I pour hot water in it?

    This formula shows how a material increases in length, (Delta L divided by L) given a change in temperature (Delta T). Delta is a greek letter (for the uninitiated its the triangle thinggy) that means “change in” like change in Length or Change in Temperature. The Alpha (gold fish looking item) is the Thermal expansion coefficient.
    The left side of the equation, change in length over initial length, equals the stress the material is experiencing. If it exceeds the compressive strength of the glass, it will shatter.

  4. Mason jars are made by numerous companies and their quality can vary greatly. Also glass is prone to developing weak spots anywhere there is a small chip or scratch. I wouldn’t pour boiling water into one if sudden breakage would cause an injury or spread water far and wide. Generally I sit a glass container in a larger bowl or the sink before I fill it with boiling water.

  5. No.
    Assuming it is at room temperature at first, and ordinary boiling water is used in small amounts.
    I don’t know what might happen if you fill it with boiling water, and leave it in the jar.
    It is common practice to pour a little hot water in the jar to preheat it and clean it before filling while canning tomatoes and other things that aren’t normally processed, simply filled and sealed.


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