$Raw Materials for Refractory:ISO Certified Low Na2O White Corundum/White Fused Alumina Grain with Al2O3 99.2 Min System 1$
$Raw Materials for Refractory:ISO Certified Low Na2O White Corundum/White Fused Alumina Grain with Al2O3 99.2 Min System 2$
$Raw Materials for Refractory:ISO Certified Low Na2O White Corundum/White Fused Alumina Grain with Al2O3 99.2 Min System 3$

$Raw Materials for Refractory:ISO Certified Low Na2O White Corundum/White Fused Alumina Grain with Al2O3 99.2 Min$

$Raw Materials for Refractory:ISO Certified Low Na2O White Corundum/White Fused Alumina Grain with Al2O3 99.2 Min System 1$

$Raw Materials for Refractory:ISO Certified Low Na2O White Corundum/White Fused Alumina Grain with Al2O3 99.2 Min System 2$

$Raw Materials for Refractory:ISO Certified Low Na2O White Corundum/White Fused Alumina Grain with Al2O3 99.2 Min System 3$

Raw Materials for Refractory:ISO Certified Low Na2O White Corundum/White Fused Alumina Grain with Al2O3 99.2 Min

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Loading Port:: China Main Port

Payment Terms:: TT OR LC

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Packaging & Delivery

Packaging Detail:	1) 25kg woven bag 2) 25kg paper bag 3)1000kg big bag 4) According to clients' requirement.
Delivery Detail:	Within 30 days or depend on the requirement of clients.

Specifications

White Fused Alumina grain with Al2O3 99.2 min
ISO9001 Certificated
Strong wear and heat resistance

1. Advantage

White fused alumina is made of quality alumina powder by smelting at 2050 °C.

1). High purity

2). Good self-sharpening

3). Less thermal diffusivity in grinding

4). Strong acid-alkali resistance

5).Excellent high-temperature stability,

6). Low porosity, etc

2. Available Size:

Refractory grade:

12-6mm 10-8mm 8-5mm 5-3mm 3-1mm 1-0mm 1-0.5mm 0.5-0mm 0.3-0mm....

80F 100F 120F 150F 180F 200F 240F 270F 320F/325F...

Abrasive Grade:

F8 F10 F12 F14 F16 F20 F24 F30 F36 F40 F46 F60 F80

F100 F120 F150 F180 F220

3. Applications :

A.The abrasive tools: grinding high carbon steel, high-speed steel and chilled steel.

B. Lapping and polishing medium

C. Crucible

D.Steel ladle

E. Catalyst carrier

F. Special ceramics and super refractory materials.

4. Physical Index:

Color	White
True Density	3.96g/cm3
Bulk Density	1.75-1.95g/cm3
Microhardness	HV2200-2300
Mohs Hardness	9.0
Melting Point	2250°C

5. Chemical Composition

Typical Value:

Al2O3	99.5%
Na2O	0.25%
Fe2O3	0.04%
SiO2	0.03%

Abrasives Grade:

Grit Size	Al2O3	Na2O
F12-80	>99.22%	<0.35%
F100-240	>99.0%	<0.4%

Refractory Grade

Grit Size	Al2O3	Na2O
0-1mm	>99.22%	<0.35%
1-3mm	>99.3%	<0.3%
3-5mm	>99.3%	<0.3%
200mesh	>99.0%	<0.4%
325mesh	>99.0%	<0.4%

ISO Certificated Low Na2O White Corundum/White Fused Alumina Grain with Al2O3 99.2 min

Q: Kinds of refractory mortar: It needs no heating when hardened. There are two kinds of refractory mortar, the finished products and semi-finished products. Clinker is compounded in proportion according to the hardening temperature. (3) Chemical bonding refractory mortar is made from refractory aggregate and chemical binders (inorganic, high alumina refractory mortar). After this refractory mortar with thermal hardness is hardened, it has some contraction. Ther is a wide variety of refractories used on the constrcuction sites: // a, Advanced refractories (1770 ~ 2000 ℃) and AAA level refractories (2000 ℃ above). It can only be delivered in dry state. Air hardening refractory mortar is often compounded air hardening binders such as sodium silicate. It will harden below ceramic bonding temperature. According to different binding agents.

Q: What are the requirements of refractory temperature of refractory brick?: Oxygen fluctuation of load once happened during operation. Sometimes oxygen control valve will cause oxygen fluctuation of load, and sometimes large particles will block valve of high pressure coal slurry pump. The sudden drop in flow of coal slurry may cause relative excess of oxygen. Oxygen fluctuations directly cause fluctuations in furnace temperature. The range of oxygen fluctuations is 500m?-600m?. The maximum can reach about 1000m?. A sudden increase in oxygen causes a sudden increase in furnace temperature, which will suddenly burn out high-temperature thermocouple. The situation has a great influence on refractory brick and should be avoided. Furnace temperature is very inportant to life of lining of refractory bricks, so it should be strictly controlled not to overheat. There is a cinder layer on the surface of refractory bricks under the condition of normal production. In fact, cinder layer is dynamic. If the temperature is low, cinder layer is thick. If the temperature is high, cinder layer is thin. Appropriate cinder layer may slow the scour of high temperature gas and molten slag. The requirement of refractory brick is higher than that of stoves which use heavy oil as raw material. The main reason is permeability and corrosion of molten slag to refractory material. When replacing refractory bricks, it is found that penetration thickness is 10mm-20mm. After slag penetrates, strength decreases significantly. If temperature is high, erosion intensifies. According to the relevant information, when the operating temperature exceeds 1400 ℃, etching effect multiplies.

Q: What's the maximum temperature that the refractory ceramic fiber cloth can endure?: Ceramic fiber cloth is high temperature resistant and its continous use temperature can be up to 1000℃. It has high temperature resistance, low heat conductivity, thermal shock resistance, low thermal capacity; superior insulating property at high temperature, long service life; resistance to nonferrous metals like molten aluminum and zinc erosion; low and high temperature strength; innocuity with no adverse effect on the environment; and it is easy to install.

Q: What needs to be noted when choosing and using blast furnace fireproof materials? Who knows?: there are different temperatures in various parts of the blast furnace, thus using different types of refractory.

Q: How long is the duration of fire resistance that fireproof door of level B can endure?: The national standard for fireproof door of level B is 1.5h, which must be achieved. The data GB12955-2008 means that the door leaf of raw material is 0.8mm-1.2mm in thickness and door frame is 1.2mm-1.5mm in thickness. And other metal melting temperature shall not be less than 950℃, the duration of fire resistance shall not be less than 0.9 hours. Fire department will check and accept based on the manufacturer's inspection report, so you have to refer to manufacturer's inspection report if you want to know more in detail.

Q: who knows how to classify the fire resistant levels of fireproofing material?: Materials used in construction are called construction materials. The combustion performance of construction materials refers to all physic and chemical changes happened when burning or contacting fire, the properity is measured by combustibility of material surface and flame transmission, heating, smoke,charring, weightlessness, and the producing of toxicity resultant. Our national standard GB8624-97 classifies the combustion performance of construction materials into following several levels. Class A: Incombustible building material, class B1: Nonflammable building material, class B2: Combustible?building?materials, class B3: Inflammability construction materials, generally speaking: first fire resistant level construction is the mixed construction of reinforced concrete structure or brick wall and steel concrete structure; second fire resistant level construction is the steel structure roof truss, reinforced concrete column or mixed structure made by brick wall; third fire resistant level construction is the wood and brick made by wooden roof and brick wall; fourth fire resistant level one is the combustible?structure made by wooden roof, hard-comnustible component wall.

Q: What are the components of refractory clay?: It is different from non-cement castable refractories, which does not rely on the addition of cement for combination, instead it uses chemical binder. It is refractory castable (also known as chemical bonding castable). Non-cement refractory castable takes oxide or synthetic compound ultra-fine powder or oxide sol-gel which is similar to the chemical composition of material in tungsten castable. Since the use of superfine powder or sol as binder, it has low impurity content, and therefore the refractoriness and slag erosion resistance of the castable will not be reduced. Besides, the self combination in use can help to improve high-temperature structural strength. Non-cement castable refractory is made up of refractory aggregate and powder, superfine powder of oxide or sol, trace amount of dispergator (or anti-coagulant) and proper slow acting hardener. Non-cement castable is mainly coagulated and combinated by ultrafine powder of oxide or sol, therefore, it has certain requirements for ultrafine and sol. Ultrafine powder used refers to less than 1 / zm particles. Ultrafine powder used in non-cement castables are SiO2, Al2O3, Cr2zrOz, etc. SiO micro powder is often adopted, which is the dust recycled during the smelting of metallic silicon, ferro-silicon alloy, the generation process is as follows: This recycled SiO2 powder has an average particle diameter of 0.5 pM, and it is spherical with large surface area. It is amorphous substance with high activity, so it has good bonding strength. The sol used are mainly alumina oxide and silica sol. Silica sol is made by ion exchange of sodium silicate after Na ions are removed. It can also be made after hydrolysis of ethyl silicate. There are several ways of preparing alumina sol, the easiest method is to prepare by the reaction of metallic aluminum or alchlor with hydrochloric acid.

Q: what is steel fire door made of ?: 1. fire resistance steel door has steel made door frames, door leaf framework and door panels. if the door leaf is filled with nontoxic fire insulation material, added with fireproof hardware accessories, which consists of a door that is fire resistance. 2. Category 1)safety facilities to prevent underground building from fire expansion and control volatilation. It is usually divided into steel and wooden fire door. 2) Class A fire doors, fire endurance of 1.5 hours; B fire doors, fire endurance of 1.0 hours; Class C fire doors, fire endurance of 0.5 hours. 3) In fact, there are many types of fire doors. For example, there are wooden made fire doors glass fire doors and steel fire doors based on different materials. access control fire doors, entrance fire resistance door, interior fire doors, explosionproof and fireproof door, quick-lock fireproof doors, quick opening door encountered with fire and multi-functional fire doors. 4) Based on the installation location: External fire doors and built-in fire doors. 5) divided by technology: Electronic fire doors.

Q: How to classify fire resistance rating of brick-concrete structure?: In order to ensure the safety of the building, the fire protection measures must be taken to make it have a certain degree of fire resistance, even if there is a fire, it will not cause too much damage. According to the national conditions of our country, and in the light of other countries standards, < high-rise civil building fire protection design specification > defines fireproof rank of high-rise civil buildings into level one and two; < code for fire protection design of buildings > divides the rank into level one, two, three, four, level one is the highest level, level four is the lowest. Besides that the minimum fire resistance of the building component is specified, buildings of fire resistance rating also specified requirements for combustion performance. Because the component with the same fire resistance limit is different, it is different in the fire.According to our country national standard < building design fire protection code >, the fire resistance rating of the building is divided into four levels. The fire resistance of a building is determined by the combustion performance and fire resistance of building components (such as beams, columns, floors, walls, etc.). Generally speaking, the fire resistance building of level one is a mixed structure of reinforced concrete structure or a mixture of brick wall and steel concrete structure; the fire resistance building of level two is a mixed structure of steel truss structure, reinforced concrete column and brick wall; the fire resistance building of level three is brick-wood structure made of wood roof and brick wall; the fire resistance building of level four is combustible structure which is composed of wood roof and non-combustible wall.

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