Class A fireproof insulation material

Fire insulation materials with fire rating of A

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As the name implies, Class A Fire insulation material That is to say, it belongs to the fireproof and thermal insulation materials with the fire rating of Grade A.

Class A insulation material There are mainly A1 and A2 materials.

Class A materials include A1: monomer inorganic incombustible; A2: composite organic non combustible, i.e compound material 。

Chinese name: Class A fireproof insulation material
Interpretation: Fire insulation materials with fire rating of A
Related institutions: Ministry of Housing and Urban Rural Development Ministry of Public Security

Classification: A1 and A2
Related documents: Interim Provisions on Fire Protection of External Insulation System and Exterior Wall Decoration of Civil Buildings
Indicators: Average fiber diameter, density, etc

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Background

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Since 2010 Building insulation The occurrence of the fire event triggered the thinking of all circles on thermal insulation and fire prevention, Thermal insulation material The fire prevention performance of is unprecedented and has attracted great attention from all walks of life in the industry. However, many insulation materials catch fire when Construction process Such as electric welding, open fire and bad construction habits. These materials are available in Combustion process Melting drops and toxic smoke constantly produced in the Chlorofluorocarbons 、 Hydrofluorocarbons 、 Freon The harm of such gases to the environment cannot be ignored. To this end, the Ministry of Housing and Urban Rural Development and the Ministry of Public Security jointly released the《 Interim Provisions for Fire Protection of External Thermal Insulation System and Exterior Wall Decoration of Civil Buildings 》Notice of GTZ [2009] No. 46. In the process of insulation design, the system with better fireproof performance and excellent thermal insulation performance can win market recognition. According to the requirements of No. 46 document issued by the Ministry of Housing and Urban Rural Development and the Ministry of Public Security: residential buildings Building height More than 100 meters combustion performance It shall be Grade A. other Civil buildings It needs to be set when the height is more than 50 meters Class A fireproof material 。 For other civil buildings with a height of 24m ≤ 50m, Class B1 can be used Fire barrier 。

External wall insulation material Fire rating

Grade A Non combustible material: WW inorganic active wall insulation material 、 Graphite modified cement-based insulation board 、 Cement foam insulation board 、 Vitrified bead insulation mortar 、 Rock wool board 、 Glass wool board , foamed ceramics, etc.

Grade A Non combustible materials with low density Thermal conductivity Low, high bearing capacity, convenient construction, economical and durable, widely used as Hot pipe , thermal equipment and other industries Piping equipment and Industrial buildings Insulation on Thermal insulation material and Industrial and civil buildings Enclosure Thermal insulation Sound absorbing material 。 Because of thermal stability Good. It is often used as the fire-resistant protective coating material of steel structures.

Grade B1 It is a refractory material, mostly organic material, and a large amount of Flame retardant , such as Polystyrene board 、 Plastic extruded board 、 Phenolic board 、 Polyurethane board Etc.

Combustion performance: refers to all physical and (or) chemical changes that occur when materials and (or) products are exposed to fire, that is, fire resistance Reaction characteristics 。 The reaction characteristics of materials to fire reflect the initial stage of fire, mainly including: incombustibility, ignition (ignition), flame spread, etc. Reaction to fire test formulated by ISO/TC92 in China Method standard 。

Rock wool board and phenolic board in domestic rock wool board market, Composite rock wool board , Foam glass plate It was also a product widely produced in China at that time. With the continuous improvement of research and development of rock wool board, phenolic board and foam glass board in our country, rock wool board is used in the renovation of old buildings, and the use of construction projects is huge, so it is very small Price difference It will also become a big cost.

Level B2 Is available Flame retardant materials , also known as flame-retardant materials, are mostly organic thermal insulation materials, with appropriate amount of flame retardant added.

The properties of flame retardant materials or materials after treatment that can significantly delay flame spread.

Grade B3 by Flammability Building materials, without any flame retardant effect, are very easy to burn and have a great fire risk.

brief introduction

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(The following text is selected from China Building Standards Design and Research Institute 《 Construction of exterior wall and external thermal insulation building 》Standard No. 10J121)

1. Rock wool board External thermal insulation system of external wall , mainly through Pendulum French Hydrophobic Type B rock wool board is used for thermal insulation Insulation The material shall be connected and fixed with the base wall by the bonding and nailing process, and shall be plastered Mucilage And reinforced glass fiber mesh Decorative Mortar Finish layer Or coating Building energy conservation Thermal insulation system. The system has passed the European top insulation brand Baumit（ Baumet ）It was launched with European Technology Certification (ETA), and has more than 30 years of successful experience in fire protection and thermal insulation.

2. System structure mainly includes: bonding layer Insulation layer 、 Protective layer , finishing layer and accessories. The tack coat is composed of Bonding mortar Composition; Common insulation layer Polystyrene particle insulation mortar , expansion Polystyrene foam insulation board （ EPS ）, squeeze Molding Polystyrene insulation board (XPS) Any one of the three materials; The protective layer is made of alkali resistant mesh cloth Hot dip galvanized steel wire mesh 、 Anchors 、 Plastering mortar Combination composition; Finish layer adopts Finishing mortar , Decoration Mortar Equilightweight Functional coating Or good Air permeability Water property of Exterior wall coating 。

3. Rock wool board External thermal insulation system of external wall ， thermal conductivity Low, good air permeability, high combustion performance and other advantages, which can be used for new construction, expansion and reconstruction Residential building and Public buildings Energy saving and thermal insulation works of external walls, including external walls External insulation , non transparent curtain Thermal insulation and EPS external insulation system Fire barrier 。

Domestic standards

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Technical Specification for Application of External Thermal Insulation System of Baomi Special Rock (Mine) Cotton Board External Wall Standard No :DBJ/CT080-2010

《 Construction of exterior wall and external thermal insulation building 》New in 2010, Xinhua Bookstore Available for sale. Issuer: China Building Standards Design and Research Institute Standard No.: 10J121

The above standard is the first one on thermal insulation in China since August 2010 Fire barrier And Class A fire protection External thermal insulation system of external wall Standards.

Class A fireproof insulation material

Material grade

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Class A: Non combustible building materials, which do not produce any combustion.

Grade A1: monomer is inorganic incombustible. No fire, no open fire.

Grade A2: composite organic non combustible, i.e compound material , nonflammable, smoke volume shall be qualified.

Class B1: Flammability Building materials: fire-resistant materials have good flame retardancy. It is difficult to catch fire when encountering open fire in the air or under the action of high temperature, and it is not easy to spread quickly, and when the fire source is removed Post combustion Stop immediately.

Level B2: flammability Building materials: combustible materials have certain flame retardancy. In case of open fire in the air or under the action of high temperature, it will ignite immediately and easily lead to the spread of fire, such as wooden columns Wooden roof frame 、 Wooden beam , wooden stairs, etc.

Grade B3: flammable building materials: without any flame retardant effect, easy to burn, and with great fire risk.

Technical performance

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Inspection items	Technical indicators	Inspection basis
Average fiber diameter (μ m)	≤7.0	GB/T 25975-2010
Slag ball content (%), particle size greater than 0.25mm	≤10	GB/T 25975-2010
Density (kg/m³)	80~180	GB/T 25975-2010
Compressive strength (kPa)	≥40	GB/T 25975-2010
Tensile strength perpendicular to the surface (kPa)	≥10	GB/T 25975-2010
Thermal conductivity [W/(m · k)]	≤0.040	GB/T 25975-2010
Acidity coefficient (%)	≥1.8	GB/T 25975-2010
Mass moisture absorption rate (%)	≤1.0	GB/T 25975-2010
Hydrophobic rate (%)	≥98.0	GB/T 25975-2010
Short term water absorption (kg/m²)	≤1.0	GB/T 25975-2010
Size stability surname (%)	≤1.0	GB/T 25975-2010
combustion performance	Grade A1	GB/T 25975-2010
service life	≥ 25 years	_______

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