A brush for applying flux (chemically resistant)

A fiberglass brush is used for applying flux during soldering. The high melting point allows it to be used in the high temperature region.
Also, brushes will not be an interchangeable tool when working with acids, with caustic chemicals, when working with patina, they can be used for coloring and drawing.
Reusable brushes - the used part is burned by fire and the brush acquires its original appearance.
The cost of a brush depends on its diameter:
The price of the cauldron for 1 piece.
1,7 mm – 30 RUB.
2,0 mm – 50 RUB.
3,0 mm - 80 RUB.
4,0 mm – 100 RUB.
6,0 mm – 150 RUB.
Set of 4 pieces (1,7 mm; 2,0 mm; 4mm and 6 mm) – 330 rub.
Length :16 cm
Application: Burn the tip of the rod (5-7 mm) on the flame of a match (lighter) and knead. The adhesive composition burns out, leaving a soft fiberglass pile.
The thinned or dried pile can be cut off and the tip of the rod can be burned again - the brush will be renewed. And so long as the length of the handle is sufficient - up to a dozen times.