GB/T 3003-2017Refractory fibres and their products (English PDF)

3.1 Refractory Fiber

Refractory fiber refers to a man-made mineral fiber whose service temperature is above 800 °C, and mainly includes alkaline earth silicate fiber (AEF), aluminosilicate fiber (ASF) and polycrystalline fiber (PCF).

3.2 Alkaline Earth Silicate Fiber

Alkaline earth silicate fiber refers to a bio-soluble amorphous fiber, which is prepared by the high-temperature melting method and has the main chemical components of alkaline earth metal oxides (calcium oxide and magnesium oxide, etc.) and silicon dioxide.

3.3 Aluminosilicate Fiber

Aluminosilicate fiber refers to an amorphous fiber, which is prepared by the high-temperature melting method and has the main chemical components of aluminum sesquioxide and silicon dioxide. It can be divided into two types: aluminosilicate fiber and zirconium-containing aluminosilicate fiber.

3.4 Polycrystalline Fiber

Polycrystalline fiber refers to a microcrystalline fiber, which is prepared by the chemical sol-gel method, in which, the main crystal phase of the fiber is mullite or corundum.

3.5 Refractory Bulk Fiber

Refractory bulk fiber refers to loose refractory fibers used before the preparation of the products.

3.6 Refractory Fiber Blanket

Refractory fiber blanket refers to a soft refractory fiber product, which is usually formed by needle punching, does not contain binding agent, and has a certain size.

6.2 Specimen Preparation of Physical and Chemical Inspection

6.2.1 The preparation of general specimens shall be conducted in accordance with GB/T 17911. The specimen preparation with special requirements shall be conducted in accordance with 6.2.2 ~ 6.2.6.

6.2.2 Adopt X-ray fluorescence spectrochemical analysis - molten cast glass sheet method to test the chemical composition. In accordance with the stipulations of GB/T 21114, prepare the specimens.

6.2.3 The preparation of specimens of refractory bulk fiber for the permanent linear change on heating shall be conducted in accordance with Appendix A.

6.2.4 In the determination of the thermal conductivity of refractory fiber module (thermal conductivity of the corresponding blanket), the metal parts shall be removed first. Then, in accordance with the structural form of the module, make the thickness of the specimen reach the maximum value allowed by YB/T 4130.

6.2.5 When it is impossible to prepare specimens of rigid refractory fiber product and shapes that satisfy the test requirements, or when destructive sampling is not allowed, the same batch of raw materials may be used, in accordance with the same production process and formula, conduct the specimen preparation based on the requirements of the inspection items.

6.2.6 In the determination of the moisture content and organic content of refractory fiber textiles, the reinforced high-temperature stainless-steel wire or glass fiber yarn shall be extracted.

6.3 Physical and Chemical Inspection

6.3.1 The determination of ZrO2 shall be conducted in accordance with GB/T 4984 or GB/T 21114.

6.3.2 The determination of SiO2, Al2O3, Fe2O3, K2O and Na2O shall be conducted in accordance with GB/T 6900 or GB/T 21114.

6.3.3 The determination of CaO and MgO shall be conducted in accordance with GB/T 5069 or GB/T 21114.

6.3.4 The determination of ignition loss shall be conducted in accordance with GB/T 6900.

6.3.5 The determination of solubility of alkaline earth silicate fiber shall be conducted in accordance with Appendix B.

6.3.6 The determination of moisture content shall be conducted in accordance with GB/T 3007.

6.3.7 The determination of thermal conductivity shall be conducted in accordance with YB/T 4130.

6.3.8 The determination of thickness, volume density, permanent linear change on heating, tensile strength, resilience and slag ball content shall be conducted in accordance with GB/T 17911.

6.3.9 The determination of organic content of refractory fiber paper and textiles shall be conducted in accordance with GB/T 11835.

6.3.10 The determination of breaking force of refractory fiber cloth shall be conducted in accordance with GB/T 3923.1.

6.3.11 The determination of breaking force of refractory fiber tape and refractory fiber twisted rope shall be conducted in accordance with FZ/T 65002.

6.3.12 The determination of mass per unit area shall be conducted in accordance with GB/T 9914.3.

6.3.13 The determination of mass per unit length shall be conducted in accordance with Appendix C.

7.1 Batch

A certain number of products that are steadily and continuously produced in accordance with the same product, the same specification and variety, the same quality level and the same production process constitute a batch. The maximum batch size of products shall comply with the stipulations of Table 19. The time limit for the production of the same batch of products to be inspected shall not exceed 10 days. […]