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Furnascote Nonvit Protective Coating for Refractory, Kiln, Boiler

Whatever your industry or heat processes, Zircon-Rich Novit can help you save energy and reduce costs.

Furnascote Nonvit Protective Coating for Refractory, Kiln, Boiler

Refractory coatings designed to protect the bricks, steel, monolithics, castables, refractory and steel shells in furnaces, kilns, boilers and various high temperature vessels.

Characterized by a very high content of Zirconia (as 62.9 % Zr02) which imparts extremely high resistance to the aggressive attacking environments typically encountered at temperatures up to 1,900'C.

FURNASCOTE NOVIT has better adhesion than most conventional Zirconia based refractories.

FURNASCOTE NOVIT is used regularly in the following industries and processes:

Some Miscellaneous Applications

INCINERATOR / CREMATORIUM

The usual problems encountered are those of thermal shock and slag formation. A coating of Nonvit at 2 to 3 mm minimises the life of the refreactory lining.


ALUMINIUM MELTING / HOLDING FURNANCE (1)


The refractory lining is typically a high alumina castable which is subject to the destructive effects of high temperature and molten aluminium. The frequency of repairs is reduced by a lining of 3 to 6 mm Nonvit.


ALUMIMINIUM MELTING FURNANCE (2)


3 mm of Nonvit will seal the refractory against the leaching effects of moletn aluminium. 6mm is used to line the connencting channel.

GLASS MELTING FURNACE

Nonvit is used for patching cracks, crevics and joints on the crown. It may be applied by trowelling, ramming, tamping, pouring or caulking.

NOSE ARCH IN FIELD ERECTED WATER TUBE BOILERS



This part of the boiler is subjected to both hugh tempretures and slag attack from the products of combustion. A coating of 2 to 3 mm of Nonvit on the refractory sirface will minimis the effects of spalling, slagging and abrasion.

SUSPENDED MONOLITHIC ROOF OF FIELD ERECTED BOILER USING BOTH OIL AND SOLID FUEL



A coating of 2 to 3 mm Furnascote Nonvit applied to the refractory surface increases it resistance to the destructive effects of spalling, slagging, chemical attack and erosion.

INDUCTION FURNANCE



The rammed lining is subjected to chemical attack by molten metal and to cracking and spalling from thermal shock, 1 - 3 mm of Furnascote Nonvit will reduce these effects, extend the life of the furnace and improve the quality of the processed metal.

REHEATING FURNANCE



A thin coat of 1 to 2 mm Nonvit reduces the adhesion of slags to the floor. The Nonvit makes it easier to remove slag when cleaning.

RECEIVERS



A coating of 2 to 3 mm Furnascote Nonvit on the walls and lips of receivers will prolong the life of the lining.

SMALL LADLES



Hand ladles lined with mouldable refractory can be coated with 2 to 3 mm Nonvit to increase the number of heats and increase production life.

CRUCIBLE FURNANCE



Frequent repairs are necessary due to the damaging effects of high temperature and thermal shock. These conditions cause cracking of the refractory lining and heat losses. Nonvit coated at 2 to 3 ,, will eliminate or minimise the problem.

TUNNEL KILNS



Thermal shock and slag formation are common problems with high refractory wear around burner ports. Salt glazes are corrosive to conventional refractories. A coating of Furnascote Nonvit at 2 to 3 mm mininises the destructive effects of combustion, glazing and thermal shock. Slag removal is easier and reject rates reduced.

TUNDISH IN CONTINUOUS CASTING



Frequent repairs and shutdowns are encountered due to the effects of high temperature and thermal shock. A thin coat of 2 to 3 mm Nonvit prolongs the life of the refractory lining.

SOAKING PITS



High temperature and thermal shock lead to spalling of the refractory lining. These effects and hence the cost of maintenance can be reduced by application of 2 to 3 mm Nonvit.

ELECTRIC ARC FURNACE



The centre section of the roof is made of either castable or plastic refractory. A coating of 2 to 3 mm of Nonvit will minimise the destructive effect of high temperature and thermal shock, prolonging the life of the refractory.

BAFFLES IN WATER TUBE BOILERS



A thin coat of 1 to 2 mm of Nonvit on the baffles prevents or minimises the effects of spalling, reduces the adhesion of slag and ensures a gas tight surface.

WATERTUBE OIL FIRED POWER BOILER



The burner throat is subjected to intense wear and tear due to the effects of high temperature, slagging, chemical attack, erosion and thermal shock. A coating of 2 to 3 mm of Nonvit resists these combined effects on the refractory lining. A coating of 1 to 2 mm on the walls and floors minimises the adhesion of slags and helps in prolonging the life of the refractory life.

FIRETUBE PACKAGE TYPE BOILERS FOR PROCESSING



High temperature, thermal shock, slags, chemical attack and erosion have a devastating effect on the parts exposed to heat, particularly the burner throat. A 2 to 3 mm coating of Furnascote Nonvit on the burner throat and a 1 to 2 mm coating the rear and front baffles will extend the life of the refractory lining.

SPECS / DATA SHEET

"Furnascote" is the-collective name for a series of refractory coatings designed to protect the bricks, monolithics, castables and steel shells in furnaces, boilers and various high temperature vessels.

Furnascote refractories are characterised by a very high content of zirconia (as 62.9% ZrO2) which imparts extremely high resistance to the aggressive environments typically encountered at temperatures up to 1900°C. Furnascote has better adhesion than most conventional zirconia based refractories.

THE TWO MAIN FURNASCOTE TYPES

NONVIT
Finish: Matt, buff coloured, non-vitreous.
Temperature Range: Up to 1,910°C

HIGLAZE
Finish:Vitreous, highly glazed.
Temperature Range: 850 -1,250"C

NONVIT is the versatile, general purpose product. HIGLAZE is used as a slag resistant finish to~ONVIT in annealing furnaces, spouts and funnels. '

A 3mm protective layer of Furnascote can typically increase the working life of any underlying refractory by a factor of two to four times.

Furnascote is supplied in the form of a powder which is mixed with cold water to the consistency of a paste, cement or slurry prior to application by trowel, brush or spray.

MAIN USES FOR FURNASCOTE

. To reduce the effects of thermal shock.
. To protect refractories against the aggressive effects of burning fuel oil, gas and solid fuels.
. To produce a gas tight surface and minimise energy losses.
. To reduce spalling.
. To eliminate cracking.
. To reduce slag adhesion.
. Generally, to increase the working life of furnaces and reduce the costs of maintenance shut downs.

FURNASCOTE is used regularly in the following industries and processes:

Preparation:
FURNASCOTE should only be applied to sound, clean surfaces. Old refractory surfaces must be thoroughly cleaned with a scraper or wire brush removing all loose pieces. Any glassy surfaces should be roughened with an abrasive disc. Cracks and holes should be cleaned out and then filled with a paste of NONVIT.

Mixing:
Mix FURNASCOTE with water to a smooth, creamy paste by adding 1 litre of water to 10kg powder. Adjust the consistency of the "mix to suit brushing or trowelling as required. Use less water for a repair mortar or plugging mix. For spray application, add more water to form a slurry and apply using cement spraying equipment. Allow to stand after mixing for approximately 1 hour minimum then re-mix briefly (preferably 3 to 4 hours).

Application:
Using a brush, trowel or spray, coat the furnace walls, hearth, ceiling, bridges etc. to a thickness of approximately 3mm. After an hour, further coats of NONVIT or HIGLAZE may be applied as required.

Drying:
Allow to dry out thoroughly. Thin coatings (1-2mm) for a few hours; 24-72 hours for thicker coats. 7 days should be allowed when NONVIT has been used as the mortar for building with new refractory bricks.

Firing:
Raise firing temperature as slowly and evenly as possible, typically at 2SOC per hour, until 125°C is reached. Thereafter, for NONVIT, the furnace may be heated to its working temperature as usual. For HIGLAZE the first firing must attain at least 1200°C, thereafter, any temperature up to 1650°C can be used.
Coverage: Approximately 3kg per square metre at 1mm thickness.

General Properties:
FURNASCOTES are odourless, tasteless and non-toxic.

Form: Dry powder, density = 3.32, Bulk factor = 2.12.
Packed: 25Kg plastic drums. Chemical Resistance: After firing, FURNASCOTES are unaffected by most acids and alkalis in liquid or gaseous form, NONVIT being particularly resistant to vanadium pentoxide. A 3mm coating is gas tight at normal pressures.

Physical Properties:
FURNASCOTES become slightly elastic above 200°C thus providing outstanding resistance to thermal shock. Thermal expansion is approximately 1 % over the range 0°C-1910°C.

Shrinkage is less than 0.25%.
Emissivity Value = 0.58
K Value = 3.5 at 500°C.
Resistance to powdering is excellent.

Chemical Analysis of NONVIT:
(mainly as oxides) - %
Zirconium 62.97
Aluminium 1.63
Calcium 1.37
Magnesium 0.34
Silicon 32.06
Titanium 0.25
Boron 1.10
Fluorine 0.25 (as fluoride)

HEALTH and SAFETY:
Avoid inhalation of dust. Wear dust mask, gloves and goggles whilst mixing and applying FURNASCOTE.


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