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“Wet” felt

“Wet” felt is a fibrous material permeated with binding agents and normally delivered in the form of rolls. It is made from mullite-siliceous fibers and inorganic binders.
Depending on the amount and concentration of the binders used, in line with the degree of compression applied when felt – still in wet condition- is being installed, it fits in with about any surface once dried up, demonstrating required density and endurance .
“Wet” felt characteristics:

Products in the form of “wet” felt are efficacious and convenient when used for high-temperature insulation of machines of complicated shape and configuration, curvelinear surfaces as well as the sealing of seams.
Once installed, this product will not emit any harmful fumes or substances during the process of drying, either in normal conditions or when a drying process is used.
“wet” felt is easy to lay out
It can easily be transported at any time of the year

	Mark
	VR-300		VR-350		VR-400	VRP-300	VRP-350	VRP-400
Density, kg/m3	320		370		420	320	370	420
Max. usage temperature, 0С	1200					1350

Thermal conductivity, W/mK, not more, at 600 0С	0,16	0,18		0,17		0,16	0,18	0,17
800 0С	0,22	0,23		0,22		0,20	0,23	0,22
1000 0С	0,29	0,32		0,30		0,24	0,32	0,30
1200 0С	-	-		-		0,44	0,46	0,44
1300 0С	-	-		-		0,52	0,54	0,52
Shrinkage at 1273 K, %, not more	1,5
Mass proportion of Al2O3, %, not less	51					48
Mass proportion of Cr2O3 %, not less	-
Dimension of the roll, mm.	500; 600;
Width, B Length, L Thickness, H	500; 600; 750; 1200
	from 2 to 250

* The figures in the table are given for wet thick felt in dry condition.
** L=500; 600; 750

The figures in the table are given for wet thick felt in dry condition.

Not wettable by aluminium melts, “wet” felt has earned a good reputation in non-ferrous metallurgy. Trays and spouts made of wet felt are easy to install and use in pouring aluminium.

Industrial use of wet felt

thermal insulation of the outer surface of glass furnaces` arches
lining of shaft furnaces` lids.
lining of ladle-heating stands` lids.
lining of steel ladles` covers.
thermal insulation of heating furnaces` skid pipes of rolling mills.
Inner-surface lining of industrial furnaces` gas ducts.
lining for spouts used for pouring liquid aluminium.
thermal insulation of high-frequency current machines` inductors surfaces.
thermal insulation of the walls of industrial furnaces, boilers, foundry ladles.
heat-reflection lining of inner surfaces of gas industrial furnaces` walls and arches
Fire-prevention and protection of electric cables against the impact caused by an outer source of fire or self-combustion
sealing of seams and crevices in the fireproof walls and arches of industrial furnaces.
emergency repair of the patches of industrial furnaces` roofs with loose or destroyed bricks.

The use of wet felt as PN-34 cover` lining resulted in: (JSC «Kirov-Energomash Plant», St. Petersburg)

7 times` reduction in the weight of the cover
the temperature of the outer surface of the cover being reduced to 500 degrees Celcius
higher speed at which melting charge was heated -1200° C p/h
shorter time span needed for the furnace to reach a working temperature (2-hour reduction)
increased productivity of the furnace