Lightweight Insulating Refractory Bricks That Perform Well At High Temperatures
Special size and OEM Service also provide!
The size is precise, providing kinds of shapes according to customer's drawing
Product Description:
Also known as silica insulation bricks. More than 91% of silica, with a bulk density of 1.2g/cm3 or less, is a lightweight refractory material. The refractoriness and load softening temperature are similar to ordinary silica bricks with the same composition. However, due to many pores, the compressive strength, slag resistance, and corrosion resistance are not as good as those of ordinary silica bricks, but the thermal shock resistance is improved.
Light weight silica brick
Using finely divided silica as a raw material, its critical particle size usually does not exceed 1 mm, and particles smaller than 0.5 mm therein are not less than 90%. The flammable substances are added to the ingredients or a porous structure is formed by a gas generation method and is obtained by firing. Can also be made without burning products. It is mainly used in all parts of the kiln that require heat insulation or lighter weight without direct contact with the melt, from aggressive gases, and without rapid temperature changes. Used at high temperatures and cannot be contacted with basic refractory materials. According to different materials, the maximum use temperature is 1200 ~ 1550 °C.
Application
Light weight fire clay brick is of low price, but of good thermal vibration stability and thermal insulation, mainly used in thermal boiler, glass kiln, cement kiln, fertilizer gas furnace, blast furnace, hot-blast stove, coking furnace, electric furnace, casting, etc.
| Item |
Unit |
Wear-resistant refractory brick |
| NMZ-1 |
NMZ-2 |
NMZ-3 |
| Chemical composition |
Al2O3 |
% |
≥85 |
≥75 |
≥65 |
| SiO2 |
% |
≤15 |
≤25 |
≤35 |
| Fe2O3 |
% |
＜1.0 |
≤1.2 |
≤1.5 |
| Density |
g/cm3 |
≥2.9 |
≥2.6 |
≥2.5 |
| Compressive strength (normal temperature) |
Mpa |
≥100 |
≥85 |
≥70 |
| Apparent porosity |
％ |
≤18 |
≤20 |
≤21 |
| Abrasion resistance |
cc |
≤6 |
≤7 |
≤8 |
| Refractoriness |
℃ |
≥1790 |
≥1790 |
≥1790 |
|
Linear change on heating
(900℃×3h)
|
％ |
≤0.05 |
≤0.1 |
≤0.1 |
| Thermal conductivity(350℃) |
w/m.k |
≤1.8 |
≤1.8 |
≤1.5 |
| Thermal shock stability(1100℃Water cooling) |
|
20 |
20 |
20 |
Features:
1. Good resistance to abrasion and corrosion,
2. Good volume stability at high temperature,
3. Chemical attack to provide long service life,
4. Easy operation and installation,
5. Broad usage or applications and low price.
Application:
It is widely used as a primary hot face refractory lining or as back-up insulation behind other refractory in furnace(such as carbon furnace, cracking furnace, heating furnace for oil refining, roller kiln, tunnel kiln.), flues, refining vessels, heaters, regenerators and similar high temperature industrial equipment.
Packing and delivery:
Packing of Insulating brick: Standard export wooden pallet with cardboard.
Shipping of Insulating brick: By vessel or by train from any Chinese port,
Samples can be delivered by International express.
FAQ
Q1 : How can you control your quality?
A1:Donghua company will conduct reburning test and chemical analysis test on the products after the completion of the products.
Q2:What is your lead time?
A2:If you are buying a finished product, Donghua guarantees to ship within one week; if it is a customized product, it will take about 15-20 days.
Q3:What is your payments terms?
A3:We can accept 30% deposit, 70% balance to be against the BL copy or by LC, or other payment terms.
Q4:Can we visit your company?
A4:We warmly welcome your arrival.
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