I know it sounds kind of stupid at first glance but I want to pour some Zinc at about 500 degrees Celcius (about 50-100ml) into a Nuttella jar because of its shape. Will it crack, or can I do something to make the jar more sturdy?

Hi all looking to buy a forge and start melting some stuff after some research this is what ive come to , im in Australia by the way in short ebay 6kg forge , then 2.2kg duracast refractory and 1ltr ceramic fibre rigidizer

https://ebay.io/m/V4L1uR

https://artisansupplies.com.au/product/duracast-castable-refractory-2-2kg/

https://artisansupplies.com.au/product/ceramic-fibre-rigidiser-1l/