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I. Differences between Class B1 and Grade C flame retardant plates In accordance with GB8624-1997 "Classification of combustion performance of building materials and products", flame retardant plates are divided into Class A noncombustible materials: Class A homogeneous materials and Class A composite (sandwich) materials Class B flammable materials: Class B1 materials and Class B2 materials and Class B3 materials. According to GB8624-2006 "Building materials and products combustion performance rating" is divided into: A1 level, A2 level, B level, C level, D level, E level, F level. The standard Class B1 flame retardant plate in 1997 can correspond to the standard 2006 Grade B and C flame retardant plates. However, the most common fire-retardant board in the plate market basically belongs to the Class B fire rating. Currently, the flame retardant board grades on the market mainly include: A1, A2, B, C four levels.
GB 8624-2006 Test requirements for Class B and C combustion performance of building products (other than floor covering materials):
1. The flammability test (GB/T 8626), in which the flame propagates at a vertical distance from the ignition point within 60 s under the condition that the flame bombards the sample for 30 s (if necessary, also bombards the edge of the sample with a flame). (C, B Same level).
2. The monomer burning test (GB/T 20284) evaluates the effect of the product itself on the fire in a fire scene where there is a single source of combustion near the simulated product in the corner of the room. There are three specific indicators, namely: A. Flame lateral spread (LFS) shall not reach the edge of the sample (C, B with the same). B. FIGRA 0.4MJ total heat release. The threshold value for combustion is 0.4MJ and the growth rate of the index C is ≤ 250 W/S, and B is ≤ 120 W/S. C.THR600S (total heat release at 600 s) Class C ≤ 15 MJ, Class B ≤ 7.5 MJ.
3, according to GB/T 20285 for testing, production of additional smoke levels s1, s2, s3, burning drops / particles of additional levels d0, d1, d2, smoke production toxicity levels t0, t1, t2.
B, C combustion test determination:
Using flame-retardant B grade plates and C grade plates to cut a small piece (diameter 2-3mm);
1, C-level board detection: horizontal ignition, self-extinguishing within 5 seconds and no smoldering, fire-retardant density board is C-class should be no problem;
2. Class B board inspection: vertical ignition, self-extinguishing within 2 seconds, and no smoldering, flame retardant MDF B grade should be no problem.
Note: If horizontal lighting does not self-extinguish or self-extinguishing but there is smoldering smoldering, attention should be paid. The B1 level is somewhere in between and is closer to the B level requirement.
Second, how to identify fire-retardant board:
Flame retardant board how to distinguish between good and bad? Suggest one touch, two burns, three shakes, four bubbles, five smells.
One touch is whether the surface of the board is smooth or not.
The second burning is to use a blade to cut a small strip, use a lighter to burn, observe the extinguishing time, see if there is no dark flame, and can be compared with the ordinary board.
The three tricks are to use a nail to pick up the board and feel hard or soft. Then use a fingernail to stand on the surface near the board to see if the surface is easily peeled off.
Four bubbles, is to put a small sample into cold water for 24 hours and observe how much the thickness increases. This one is the most critical of the five news, that is, a few flame retardant plates together smell the edge of the plate, smelling whether it has a pungent taste, if there is a description of high formaldehyde emission, poor environmental performance, it is not recommended to buy.
Third, the type of fire-retardant plywood In accordance with the fire-retardant board's water, moisture-proof performance, the flame-retardant board is divided into the following four categories:
One type of flame retardant board is a weather resistant, boiling water resistant flame retardant plywood, and thus has the advantages of durability, high temperature resistance, and steam treatment.
The second type of flame retardant board is a water-resistant flame retardant board that can be impregnated in cold water and impregnated with hot water for a short time.
The three types of flame-retardant panels are moisture-resistant and flame-retardant panels that can be impregnated in cold water for a short period of time and are suitable for use at room temperature. Used for furniture and general construction purposes.
The four types of flame-retardant panels are non-damp-resistant and flame-retardant panels. They are used under normal indoor conditions. They are mainly used for antimony and general-purpose fire-retardant panels. There are wood, Ash, birch, beech, poplar and others.
Fourth, flame retardant plywood uses:
Millennium boat flame retardant board at the same time with the flame retardant, smoke suppression, anti-corrosion, insect resistance and stability of the five characteristics, it can be said to have a strong practicality. Maintaining the excellent physics performance, processing performance and decorative function of traditional wood-based panels, Millennium Boat Flame Retardant is widely used in hotels, hotels, convention centers, convention centers, sports centers, libraries, transportation passenger transport centers, leisure and entertainment venues, and shopping malls. , medical institutions, office buildings and other public construction and decoration projects, high-end residential construction and renovation projects and high-end furniture manufacturing projects.
Fifth, the characteristics of high-quality brand flame retardant plate flame retardant high-quality flame retardant products, smoke suppression and smoke toxicity to the national GB 8624-2012 "Building Materials and Products Combustion Performance Classification" flame retardant material requirements. At the same time in line with the national GB 20286-2006 "public places flame-retardant products and components of the burning performance requirements and signs" specification requirements. At the same time, it meets the environmental protection standard for formaldehyde emission from artificial boards. High-quality flame-retardant panels are made of high-quality wood veneers. The flame-retardant treatment overcomes the disadvantages of common plywood's flammability and effectively improves the flame-retardant performance of plywood. At the same time, the flame-retardant strength of the fire-retardant panels is still up to standard and there is no moisture-proof. , moldy and other issues.
Flame-retardant board (also known as flame-retardant board, fire-retardant plywood), fire-retardant plywood is rotated from the log into wood chips or wood planed into small wooden squares, the wood chips after the flame-retardant treatment and then glued together three Layers or layers of plywood, usually odd-numbered wood chips, and the adjacent layers of wood fibers from the vertical direction of the glue. The following millennium boat plate small series for everyone to introduce how to distinguish fire-retardant panels B1 and C-class, brand fire-retardant plywood quality is what kind of: