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The lids are typically loose-fitting in order to allow gases to escape during the heating of a sample inside. Crucibles and their lids can come in high form and low form shapes and in various sizes, but rather small 10 to 15 ml size porcelain crucibles are commonly used for gravimetric chemical analysis. These smaller crucibles and their covers ...
The crucibles were made by firing kaolinitic clay at temperatures greater than 1100°C, forming mullite. Mullite is an aluminum silicate only described in the 20th century and is responsible for the excellent properties of the Hessian crucible. [1] [2] Main production centre of the Hessian crucibles was the village of Großalmerode.
On Traprain Law, it seems the silver was valued as a raw material. Crucibles from the site show traces of silver working. [25] Finds from the hill include a massive silver chain, [26] probably made from reused Roman silver. Such Roman silver is argued to be the raw material for silver jewellery in the early Medieval period. [27] [28]
A fritted filter is often part of a glassware item, so fritted glass funnels and fritted glass crucibles are available. [ 2 ] Laboratory scale spargers (also known as gas diffusing stones or diffusors) as well as scrubbers , and gas-washing bottles (or Drechsel bottles [ 3 ] ) are similar glassware items which may use a fritted glass piece ...
Eventually, after many experiments, Huntsman was able to make satisfactory cast steel, in clay pot crucibles, each holding about 34 pounds (15 kg) of blistered steel. A flux was added, and they were covered and heated by means of coke for about three hours. The molten steel was then poured into moulds and the crucibles reused.
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