Quartz parting and annealing baskets

We supply a range of quartz baskets that allow to carry out the successive parting and annealing operations in the same container. Therefore, they substitute, both parting Kjeldah flasks, and gold annealing crucibles. This is possible because quartz withstands concentrated nitric acid attack and the necessary temperatures for annealing (quartz resists temperatures up to 1000ºC).

Quartz parting and annealing baskets withstand concentrated boiling nitric acid.

For this reason, they are suitable for parting and processing samples in parallel during the two nitric acid attacks (the first with 33% concentration, the second 49%).


Quartz parting and annealing baskets  resist temperatures up to 1000ºC.

Furthermore, quartz has an extremely low thermal expansion coefficient (5.5×10−7/°C ; 20–320°C). 

Therefore, our parting and annealing baskets resist rapid and large temperature changes without cracking (they have a great resistance to thermal shock).


They allow full scalability to mass analysis production stage, and Extend inherent parallel processing capabilities of Fire Assay.

As a result of this, they save time and reduce manipulation hazards.

Another positive side-effect of this, is that Cornets travel untouched through parting / rinsing / annealing. So Assays keep original array – no misplace errors

Last but not least, Allowed by ISO 11426


Saving of Labour, Reagents (particularly HNO3 ), lower Energy consumption, and also total batch cycling time is shorter.

Quartz beaker 50x80
Other custom made quartz accessories, ie Quartz beaker 50x80
Quartz baskets for parting and gold aneealing
Quartz Parting and Annealing Basket
Quartz Parting & annealing basket for 25 samples
Quartz Parting & annealing basket for 25 samples

Dimensions (L x W x H)
QBR-642x57x706 (2 x 3)Quartz parting & annealing bsket for 6 samplesBBW16
QBR-1257x72x7012 (3 x 4)
Quartz Parting and annealing basket for 12 samplesBBW16
QBR-1672x72x7016 (4 x 4)Quartz parting & annealing baskets for 16 samples BBW16
QBR-2587x87x7025 (5×5)Quartz Parting and annealing basket for 25 samplesBBW25
QBR-36102x102x7036 (6×6)Quartz Parting and annealing basket for 36 samplesBBW36
QBR-49117x117x7049 (7×7)Quartz parting and annealing baskets with 49 thimblesBBW49
Quartz partind and gold annealing Baskets

In addition to the baskets, we also supply all the necessary accessories to optimise their use:

  • Quartz thimbles
  • We also supply the borosilicate parting beakers in various sizes to fit the baskets. 

The quartz thimbles are provided with thin slits to evacuate the nitric acid / distilled water and possess a flange at the top to fit the holes of the basket.  In addition to this, they are removable. For this reason, it is possible to supply them as spares in case of breakage. Finally, there are two types of quartz thimbles / quartz crucibles and they suit most cornet sizes.

The beakers are supplied with watch lids or with a chimney to avoid nitric acid spillage at boiling point or to conduct the vapours. Furthermore, their diameter are specially designed to minimise nitric acid consumption. 

To summarise, the table on the left shows all the available parting and annealing baskets that we have available and the most adequate beaker for their use. Under order, we can also supply quartz baskets with larger thimbles for processes that demand a larger sample (particularly gold bullion that demansds a very large sample).

Quartz thimble for parting and annealing
Types of quartz thimbles for parting and annealing
Quartz parting & annealing baskets for 49 samples
Quartz parting and annealing baskets with 49 thimbles
Beaker with chimney
Beaker with chimney
Handling tools for quarz basket
Handling tools for quarz basket
Quartz baskets for parting and gold aneealing
Quartz baskets for parting and gold aneealing