Four major misunderstandings in the material of aluminum silicate fiber

The identification of the temperature parameters is very confusing: different indications such as temperature, maximum operating temperature, extreme temperature, classification temperature, long-term operating temperature, etc. In fact, the use temperature of aluminum silicate fiber materials is not only related to the chemical composition of the material, but also closely related to the use of atmosphere, fuel and environmental conditions. For example, if the maximum temperature of the same material that maintains its basic properties in the standard atmosphere of the experimental resistance furnace is 1260 ° C, the maximum service temperature will drop 100-180 ° C in the medium and strong reducing atmosphere, due to the heavy oil environment. Elements such as sulfur and phosphorus will be used at a lower temperature for the erosion of aluminum silicate fibers. The temperature of use should be determined by the designer, the user, and the technician of the fiber manufacturer based on the fuel, environment, and heating regime used to determine the temperature of use and the materials selected.

2. Misunderstandings in the chemical composition of aluminum silicate fiber materials:

In many years of application of aluminum silicate fiber materials, it has been found that the actual temperature does not exceed the temperature range of the material, but the fiber material causes severe shrinkage and chalking. After testing the chemical composition, Al2O3 meets the product requirements, while SiO2 is low, and the content of impurities such as Fe2O3, CaO, MgO, Na2O, K2O is seriously exceeded. Such impurities are low melting point oxides, and excess low melting point oxides will reduce the eutectic point of the aluminum silicate fiber material. When the content of impurities other than Al2O3 and SiO2 is 3.5% or more, the ratio is controlled to be within 1%, and the actual use temperature of the aluminum silicate fiber material is lowered by approximately 100 °C. Therefore, when we choose aluminum silicate fiber materials, we must not only check the composition of Al2O3, but also strictly control the content of other impurities.

3. Misunderstandings on the bulk density of aluminum silicate fiber materials:

The fiber itself consists of Al2O3 and SiO2, and its heat capacity is basically the same as that of refractory brick products. However, fiber products such as felt and carpet are formed by the fiber interlacing method to form an empty loose unit structure, and the capacity of the product is greatly reduced, which changes the heat conduction. performance. The thermal conductivity of the fiber product with a bulk density of 150-250kg/m3 is about 20% of the thermal conductivity of the heavy brick of 2070Kg/m3; it is about 37-40% of the thermal conductivity of the lightweight brick of 1300Kg/m3. The bulk density of the fiber product ranges from 150 to 250 kg/m3. As the volume density increases, the thermal conductivity decreases gradually, and the heat loss is also gradually reduced. However, with the increase of the bulk density, the structural performance of the empty loose unit is also reduced. When the capacity is greater than 400kg/m3, the thermal conductivity increases, and the heat storage loss increases, and the comprehensive energy saving is reduced. Therefore, one-sided pursuit of low or too high bulk density is not desirable.

4. Effect of slag ball content of aluminum silicate fiber material:

The slag content in the product is an important factor affecting the bulk density. The bulk density of the slag ball is 2800-3200kg/m3. The excessive content of slag balls in the fiber products will reduce the comprehensive energy-saving performance and damage the interests of users. In foreign countries, the content of slag ball with particle size > 0.25mm is controlled at ≤ 5%. However, due to the limitation of fiber manufacturing technology, the content of slag ball is controlled at ≤ 15%, that is, nearly 1/8 of fiber products is slag ball, which is higher than abroad. The content is doubled. Our company adopts a new slag removal process to ensure that the slag ball content is controlled at ≤10%, reaching the industry leading level. Therefore, when determining the bulk density of aluminum silicate fiber products, it is necessary to fully consider the content of the slag balls.
  popular searches:   Aluminum art accessories     Luxury aluminum art villa door     Aluminum art stair railing    Aluminum art security window    Aluminum art fence     Aluminum art fence    Aluminum canopy

600D Imitation Nylon Dobby

600D Polyester Oxford Fabric, imitation nylon , double twists, jet dyeing, high quality , high color fastness, high strength,thick oxford fabric, polyester bright FDY

Polyester 600D Oxford fabric PFCF waterproof pvc coating REACH RULES

Material: 100% Polyester

Yarn count: 600D*600D

Weight: 280-300 gsm

Width: 150 cm

Density: 64T-72T

Style: Plain TWILL DOBBY

Plain dyed, solid color

Finished: Waterproof, pvc coating

Usage: Tent, covers, bags, shoes, etc.

Package: By roll or according to client requirement.

Certificate: Oeko-tex standard 100, EN, SGS, ITS.

The waterproof 600D Oxford fabric is a heavyweight polyester fabric. It is exceptionally durable and hard-wearing oxford fabric. This fabric has become increasingly popular due to the multi-purpose use of this fabric. The fabric provides good durability and breathable properties. It is soft and dries well. It is a very durable fabric which has high waterproof characteristics of the fabric prevents accumulation of dirt. The fabric can be made both in printed and plain dyed types. High-resolution print, suitable for marquee covers, curtain and bags. Maximum full width 150cm.

Nylon Oxford Fabric,600D Oxford Polyester,600D Imitation Nylon Dobby,600D Oxford Fabric With Pvc Coating

SUZHOU S-PEAK TEXTILE CO., LTD , https://www.s-peaktex.com