Porcelain Crucible: characteristics, Price, types, Uses …

November 2, 2021

Laboratory materials are very varied, for example we can find alcohol lighters , flasks, racks and in this case Porcelain Crucible . This time we will focus on the latter since it is one of the most important laboratory utensils that we can find.

What is the Porcelain Crucible?

In simple terms we can say that the porcelain crucible is an instrument used to develop gravimetric processes . The latter being, some analyzes that are used to determine the proportion of an element in a sample. To do this, it must be extracted from the substances that interfere with the analysis.

It can be said that it acts as a container for the sample in the process prior to the analysis of the components. With this in mind we can say that it is a concave container, which is used to deposit both elements and substances. These substances or elements will later be subjected to high temperatures , all this in order to produce changes in their physical state.

It is important to mention that this type of instrument can vary depending on the area and therefore the element to be treated. Although the Porcelain Crucible is the most recommended for working with chemical substances in laboratories.

This is because porcelain is a material produced from the conjunction of kaolin, silica and feldspar. Basically, the silica is the one that is reduced to the plasticity of the clay, to prevent the piece from becoming deformed during firing. Once this is done, the enamel is coated and fired to turn it into a semi-waterproof object .

It is important to mention that this laboratory utensil can withstand maximum temperatures of 1050 ° C. But in addition to that, this device can resist thermal shock and corrosion.

In this sense, porcelain is one of the ideal materials for the crucible, since many substances were used in laboratories. Due to this, it is necessary to have a tool that has resistance to acid and bases with little porosity.

Porcelain Crucible Characteristics

As we can imagine the main characteristics of this instrument is that it is made of porcelain. But leaving this aside we can also find other qualities that the Porcelain Crucible has.

It is important to know that they are used for a specific function, although by design we are talking about a product with great versatility. To all this we must add that there are different types of crucibles although they all have similar characteristics. But they are very varied in terms of the material used for their design.

However, porcelain is still the easiest to produce, so it is much more affordable in terms of cost and has a very good quality.

Currently the Porcelain Crucible is one of the most used there is, however, we must know that there are many types, which have different functions. If we focus on the particular case of the Porcelain Crucible, we can say that the first characteristic of this is that it is made of porcelain.

But we also have that it is a concave container , they can have lids (made of the same material as the Crucible), it has a smooth surface and it is resistant. In the latter case, we mean that it has the ability to withstand temperatures of up to 1050 ° C and can resist chemical corrosion.

To all this we must add that although they are resistant to corrosion, this is not so strong when it comes to HF acids . On the other hand, we must bear in mind that there are some crucibles of different sizes, with a capacity that ranges from 30 to 50 ml.

What is the Porcelain Crucible for?

As we have been mentioning, this utensil is used as a container for elements that will later be subjected to high temperatures. The latter can be done to try to melt, heat, mix or burn some elements.

However, being a versatile laboratory material, they can be used for many more things and by resisting high temperatures, it does not run the risk of being damaged or deformed . Crucibles are generally used for quantitative gravimetric determinations. The latter being an analysis that measures the mass of the substances to be analyzed.

We must mention that in common crucibles a residue or precipitate resulting from an analysis method is collected . Although it can also be filtered in an ash-free solution or element. On the other hand, as it has a smooth surface, there are no problems when analyzing substances, due to contamination. We can say that this instrument can be used in:

Chemical analysis

In these cases it is used for quantitative gravimetrics . Typically, the crucible and element are pre-weighed very precisely. This is done by means of a gravimetric analysis.

For this we must use a filter paper that allows you to collect and filter. When we have this ready we must wash and dry the residues on the filter paper , then place in the oven and heat to high temperatures. The latter is done so that the volatile and wet substances have been completely removed from the sample.

When this is done the paper filter will end up burning completely without leaving any trace. Once this is done, both the crucible and the sample will be allowed to cool in a desiccator . Then both materials will undergo another gravimetric analysis on a balance. This is done in order to determine the weight of both precisely at room temperature.

Finally, the mass of the crucible, measured in advance, is finished subtracting. The result being the mass of the sample once it has dried in the crucible.

Ash analysis

Another use that is given to the Porcelain Crucible is in the area of ​​chemical analysis, where it is used for the quantitative analysis of the measurement of the mass of the ashes.

How is the Porcelain Crucible used?

Depending on the reason for which we are going to use this element, one process or another will be carried out. In the event that it is used for melting or heating. It will be necessary to use flames and tweezers to later remove them from the flame. It is important that before using it, we preheat to eliminate any trace of moisture that could alter or contaminate the analyzes.

To all this we must be careful with the substances that we have heating we must not put it pointing towards our face or any part of the body. When we finish heating the sample, we must let the crucible cool down   and then subject the sample to a gravimetric analysis.

Crucible Types

As we have mentioned, the crucible is an instrument that has different types, in fact over time it has been constantly changing. This has been done in order to adapt to the needs of each investigation.

The main difference that exists between one crucible to another is the material with which it is designed. Which will depend on the area of ​​use. Keep in mind that not all elements should be treated in the same way. Specifically, we can say that there are three types of crucibles;

  • Porcelain Crucible ; In general, this is the most used in laboratories for its properties. This is because the material is very resistant, so it can work with chemicals.
  • Silicon carbide crucible ; Silicon carbide is known as a material with semiconductor properties, being almost as hard as diamond. In particular, it has a good thermal conductivity that makes it have a good heat distribution . Another advantage of this material is that it has a great resistance to chemical erosion, which is why they are mostly used for metal casting. However, the problem with this crucible is that it is much more expensive than the Porcelain Crucible.
  • Graphite crucible ; Like the Porcelain Crucible, this is one of the most used there is. We must bear in mind that graphite is a polymorph of carbon and has non-stick properties and high resistance to heat. In fact, it can resist temperatures of up to 1500 ° C and is used mostly for metal smelting.

How to cure a crucible?


If we take into account all the aforementioned we can say that the Porcelain Crucible is one of the most used in laboratories. This is because they have a great thermal resistance , so they can be used when it comes to heating, melting or calcining some type of sample.

Keep in mind that this is one of the main processes used in different types of substance testing and analysis. Which although they can be carried out in another way, this will not be as optimal as expected.

It is important to mention that although there are several instruments used to heat various types of substances. The truth is that its resistance to heat and corrosion is not great. Because of this you will end up with corrosion or deformation.

Dr. Loony Davis5
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Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
This is my personal project but I also collaborate in other blogs, it is the case, the most important web on water currently exists in the US, if you are interested you can read my articles here.

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