Holding tests

How 30 g samples can represent 3000 Kg batches

Why samples are representative

A sample is deemed representative depending on the preparation methods and obtained features. Only a properly prepared sample with specific features is considered reliable and can, therefore, help identifying the material’s value.

  1. First of all, the material is blended. We own mixers of different sizes and choose which one to use depending on the total quantity of the material.
  2. The material is put in the mixers and blended for 20 to 30 minutes, until it obtains a specific level of homogeneity.
  3. We collect the first sample weighing 1 to 1.5 kg, that is further sieved and manually blended.
  4. We collect the current sample weighing 30g to 100g.


We blend materials as long as necessary to obtain the optimal homogeneity.

Number of collected sample units

As many units of the current sample as necessary can be collected. Six units are usually collected: two for each part and two additional ones for different reasons (one for the counter-analysis performed by external labs, hired both by TCA and by the client).

Additional sieving and milling

We collect around 1kg of material from the blended batch. We sieve it further, checking the correct milling, homogeneity and particle size. If the material has rough particles, we mill it again using a disc mill, as many as three times. The collected sample is placed in anonymously-labeled recipients and is ready to be analyzed.


Witness the sampling process

It is possible and recommended for clients or representatives to take part in and witness the sampling process of supplied samples.


© 2015 - 2020 TCA SpA
Arezzo, Italy - P. IVA 00279290514

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