How to distinguish the brand of fire-retardant ply

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Fire retardant board (also known as fire-retardant board, fire-retardant plywood), fire-retardant plywood is a three-layer or multi-layer plywood made of wood chips that are spun into wood chips or planed into small wood cubes, and then glued with adhesives after fire-retardant treatment,

fire-retardant board (also known as fire-retardant board, fire-retardant plywood), fire-retardant plywood is spun into wood chips or planed into small wood cubes from logs, Plywood with three or more layers, which is made of wood chips after flame retardant treatment and then glued with adhesives, is usually made of odd layers of wood chips, and the fiber directions of adjacent layers of wood chips are glued perpendicular to each other. Next, the Millennium boat panel editor will introduce how to distinguish between grade B1 and grade C flame-retardant boards, and what the quality of brand flame-retardant plywood is:

I. The difference between grade B1 and grade C flame-retardant boards

according to GB8624-1997 classification of combustion performance of building materials and products, flame-retardant boards are divided into grade a non combustible materials: Grade a homogeneous materials and grade a composite (sandwich) materials; Class B combustible materials: Class B1 materials, class B2 materials and class B3 materials. According to GB8624-2006 classification of flammability of building materials and products, it is divided into A1, A2, B, C, D, e and F. The grade B1 flame retardant board of 1997 standard can correspond to the grade B and C flame retardant board of 2006 standard. However, the most common fire-retardant board in the plate market basically belongs to class B fire rating. At present, the fire-retardant board grades in the market mainly include: A1, A2, B and C

gb 8624-2006 stipulates that the level B and C combustion performance test of building products (except paving materials):

1. Flammability test (gb/t 8626). Under the condition that the flame bombards the sample for 30s (and bombards the edge of the sample with flame if necessary), the vertical distance between the flame propagation and the ignition point within 60s shall not exceed (Level C and B are the same)

2. Monomer combustion test (gb/t 20284), to evaluate the impact of the product itself on the fire in the corner of the room under the fire scenario of simulating the monomer combustion fire source near the product. There are three specific indicators, namely: a. the transverse flame spread length (LFS) shall not reach the edge of the sample (the same for grades C and b). B. Figra0.4mj total heat release The combustion growth rate index with a threshold value of 0.4mj, class C ≤ 250 w/s, class B ≤ 120 w/s. C. Thr600s (total heat release at 600s) class C ≤ 15 MJ, class B ≤ 7.5mj

3. Carry out the test according to gb/t20285, and the additional grades of smoke production are S1, S2 and S3, the additional grades of combustion droplets/particles are d0, D1 and D2, and the additional grades of smoke production toxicity are T0, T1 and T2

b, C-level combustion test measurement:

use a blade to cut a small piece of flame-retardant B-level board and C-level board at random (diameter 2-3mm)

1. Level C board detection: if it is ignited laterally, self extinguished within 5 seconds and there is no smoldering, it should be no problem if the flame-retardant density board is level C

2. Grade B board detection: Ignite vertically, self extinguish within 2 seconds, and there is no smoldering. There should be no problem with grade B flame-retardant MDF

note: if the transverse ignition will not self extinguish or there is a dark flame smoldering although it is self extinguished, attention should be paid. Level B1 is between the two, which is closer to level B requirements

II. How to identify the flame retardant board:

how to distinguish the quality of the flame retardant board? It is suggested to touch, burn, pinch, bubble and smell

one touch is to touch whether the board surface is smooth

second burning is to cut a small strip with a blade, burn it with a lighter, observe the extinction time, and see if there is a dark fire, which can be compared with the ordinary board

three pinches, that is, pinching the board core with fingernails, feeling hard or soft; Then use your fingernails to pinch up near the surface of the board, and observe whether the surface layer is easy to peel off

four bubbles is to soak a small sample in cold water for 24 hours and observe how much the thickness increases. This is the most critical five smells, that is, several flame-retardant boards are stacked together and pasted on the edge to smell whether it has a pungent smell. If so, it indicates that the formaldehyde emission is high and the environmental protection performance is poor, so it is not recommended to buy

III. types of fire-retardant plywood

according to the water resistance and moisture resistance of fire-retardant boards, fire-retardant boards are divided into the following four types:

one type of fire-retardant boards is weather resistant, boiling water resistant and fire-resistant plywood, which has the advantages of durability, high temperature resistance and steam treatment

class II flame-retardant board is water-resistant flame-retardant board, which can be soaked in cold water and hot water for a short time

the three kinds of flame-retardant boards are moisture-resistant flame-retardant boards, which can be soaked in cold water for a short time, and are suitable for indoor use at room temperature. For furniture and general construction purposes

the four types of flame-retardant boards are non moisture resistant flame-retardant boards, which are mainly used for food and general purposes under normal indoor conditions. The materials of flame-retardant boards include basswood, Fraxinus mandshurica, birch, elm, poplar, etc

IV. application of flame-retardant plywood:

Millennium boat flame-retardant board has five characteristics: flame retardancy, smoke suppression, corrosion resistance, insect resistance and stability, which can be said to be highly practical. Maintaining the excellent physical performance, processing performance and decorative function of traditional wood-based panels, Millennium boat flame-retardant panels are widely used in public construction and decoration projects such as hotels, conference centers, convention and exhibition centers, sports centers, libraries, transportation and passenger transport centers, leisure and entertainment places, shopping malls, medical institutions, office buildings, building decoration projects of high-end residential buildings and manufacturing projects of high-end furniture

v. characteristics of high-quality brand flame retardant board

the flame retardancy, smoke suppression and smoke toxicity of high-quality flame retardant board products meet the requirements of flame retardant materials in national GB 8624-2012 classification of flammability of building materials and products. At the same time, it meets the specification requirements of GB 20286-2006 "flammability requirements and labeling of flame retardant products and components in public places". At the same time, it meets the environmental protection standard of formaldehyde emission from man-made panels. The high-quality fire-retardant board is processed from high-quality log veneer. While the fire-retardant treatment overcomes the shortcomings of ordinary plywood that is easy to burn, and effectively improves the fire-retardant performance of plywood, the bonding strength of the fire-retardant board is still up to standard, and there are no moisture-proof, moldy and other problems




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