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

1 Scope

China's national standard for refractory fibres and the products made from them. It specifies the terms and definitions, the classification, grading and identification, the technical requirements, the test methods, the quality assessment procedures and the packaging, marking, transport, storage and quality certificate, and it applies to refractory bulk fibre, felts, blankets, modules, boards and rigid shapes, papers and textiles. Refractory fibre insulation changed how furnaces are built. A traditional lining is brick: heavy, slow to heat, and storing an enormous amount of heat that is lost every time the furnace cools. A fibre lining weighs a fraction of it, has a very low thermal conductivity, and stores almost no heat - so a furnace lined with fibre reaches temperature far faster, uses far less fuel on a cyclic duty, and can be built on a lighter structure. For any furnace that is heated and cooled rather than run continuously, the saving is decisive. The material also has a health history that shapes its standards. Refractory ceramic fibre is respirable, biopersistent in the lung, and classified as a suspected carcinogen, and that has driven the development of alkaline earth silicate fibres that dissolve in lung fluid within days rather than persisting - which is why this standard carries a normative annex giving the method for determining the solubility of alkaline earth silicate fibre in simulated lung fluid. The other normative annexes are the specimen preparation for the permanent linear change on heating of bulk fibre, which is the property that determines whether a lining shrinks away from itself in service, and the determination of mass per unit length of twisted rope. Issued on 7 September 2017 and in force since 1 August 2018, it replaces GB/T 3003-2006.

This Standard specifies the terms and definitions, classification, grading, identification, technical requirements, test methods, quality assessment procedures, packaging, markings, transportation, storage and quality certificate of refractory fibers and products. This Standard is applicable to refractory bulk fibers, fiber felts, blankets, modules, boards and rigid products and shapes, papers and textiles, etc.

2 Normative References

The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 2828.1 Sampling Procedures for Inspection by Attribute - Part 1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection

GB/T 3007 Refractory Products - Determination of Moisture Content

GB/T 3923.1 Textiles - Tensile Properties of Fabrics - Part 1: Determination of Maximum Force and Elongation at Maximum Force Using the Strip Method

GB/T 4984 Chemical Analysis of Refractories Containing Zirconia

GB/T 5069 Chemical Analysis of Magnesia-alumina Refractories

GB/T 6900 Chemical Analysis of Alumina-silica Refractories

GB/T 7689.3 Reinforcements - Test Method for Woven Fabrics - Part 3: Determination of Width and Length

GB/T 9914.3 The Method for Reinforcement Products - Part 3: Determination of Mass Per Unit Area

GB/T 11835 Rock Wool, Slag Wool and Its Products for Thermal Insulation

GB/T 17911 Methods of Test for Refractory Fiber Products

GB/T 18930 Terminology for Refractories

GB/T 21114 Refractories - Chemical Analysis by X-ray Fluorescence (XRF) - Fused Cast-bead Method FZ/T 65002 Test Methods for Physical and Mechanical Properties of Ropes and Belts for Special Industries YB/T 4130 Refractory Materials - Determination of Thermal Conductivity (calorimeter)

3 Terms and Definitions

What is defined in GB/T 18930, and the following terms and definitions are applicable to this Standard.

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. measurement of the length and width of refractory fiber textiles shall be conducted in accordance with GB/T 7689.3; the length of the test sample shall be not less than 1 m; the length shall be accurate to 1 m and the width shall be accurate to 1 mm.

6.1.3 The thickness of refractory fiber module and rigid refractory fiber product and shapes shall be measured by a tape or steel ruler, accurate to 1 mm. The thickness or diameter (side length) of refractory fiber board, felt, blanket, paper and textiles shall be conducted in accordance with GB/T 17911.

6 Test Methods...