Zie ook de reference comments

Probably source text error.

It seems 'flask' should be 'model'

To obtain a plaster mold in a polymerization flask, use class II gypsum (XXXI), class III for working models, especially XXXIII is recommended.
With a brush to cover the scalded flask twice with Izo-sol - isolating liquid.

Je zou dit kunnen herschrijven als:

To obtain a plaster model in a polymerization flask, use class II gypsum (XXXI), class III for working models, especially XXXIII is recommended.

With a brush to cover the scalded [gypsum] model twice with Izo-sol - isolating liquid.




For the rational manufacturing of resin dentures in the casting technique. A magnet is integrated in the centre of the flask base to securely fix the plaster model for silicone and gel investment. The single-sided perforated flask base also serves as a swing-open tooth compartment sieve with individual compartments for 14 teeth and enables the simple cleaning using a steam cleaner or a wax scalding unit.

https://www.laboshop.com/index.php?id=6&artnr=14005&L=1&pg=3...

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Note added at 2 hrs (2024-03-13 20:10:50 GMT)
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'plaster - gypsum ' worden hier als synoniemen gebruikt

Zie ook 'stone'

Term stone
Variations dental stone
See also die stone, model stone, investment
Definition A gypsum-based material that sets up harder and more dense than plaster. Dental stone is typically colored with dye to distinguish it from plaster.

https://ptc-dental.com/dictionary/index.php?exact=stone



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Note added at 2 hrs (2024-03-13 20:12:29 GMT)
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Term plaster
Pronunciation PLAS-tur
Variations plaster of Paris
See also stone, investment
Definition A semi-hard, white, quick-setting paste of water and powdered gypsum (calcium sulfate) that hardens on drying.

https://ptc-dental.com/dictionary/index.php?exact=plaster

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Note added at 1 day 3 hrs (2024-03-14 21:53:41 GMT)
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Ik zet deze nog even naast elkaar:

Asker's context:

To obtain a plaster mold in a polymerization flask, use class II gypsum (XXXI), class III for working models, especially XXXIII is recommended.
With a brush to cover the scalded flask twice with Izo-sol - isolating liquid

Web reference:
In order to obtain dental stone model in polymerization container, use dental stone of II class (Stodent II), for working models dental stone III class to be used (especially Stodent III). Alter scalding out, the wet dental stone model cover with isolating liquid Izo-sol.

https://www.zhermack.com/public/uploads/Villacryl-Base-Free-...

By the way, the English in all the references, including your context text, is far from perfect.

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Note added at 4 days (2024-03-18 10:40:20 GMT) Post-grading
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All specimens were prepared by using silicone molds made of rectangular custom-made plastic boxes. The plastic boxes were used to form the rectangular silicone molds. The rectangular patterns (15*15*3 mm3) were made of heavy body condensation silicone material. Wax was melted and placed on the silicone molds. The glass slab was used to control the thickness of specimens. The molds were made by placing the rectangular wax in a metal flask with dental stone. The lower half with the flask was added up with mixed dental stone and was allowed to set for 1 hour. The stone surface was painted with a separating medium. The upper half of the flask was placed over the lower half and filled with mixed dental stone and allowed to set for 1 hour. The flask was placed into wax scalding unit for boiling out the wax (100°C, 5 minutes). The halves of the flask were separated. The stone surface was painted with separating medium.

https://www.jdat.org/data/upload/2020OR0001_4.pdf