Fireproof plywood does have a fire rating. Fire rating is an important indicator for measuring the combustion performance and fire resistance limit of materials in a fire. For fire-resistant plywood, its fire rating is usually determined based on different standards and testing methods.
In China, according to the "Classification and Marking Regulations for Burning Behavior of Building Materials" GB8624-2012, the fire rating of fireproof plywood may be B1 or B2. B1 grade fire-resistant plywood is a flame-retardant material that can withstand a certain amount of time in a fire without burning or burning very little, effectively curbing the spread of fire. B2 grade fireproof plywood belongs to non flammable materials, but it can still burn under certain conditions. Its combustion is not too intense, and it is not easy to cause fires to rapidly expand in a short period of time.
In addition, according to the European grading system specified in the EN135011 standard, fire-resistant plywood is also classified into corresponding grades. For example, when the density of plywood is greater than 500kg/m ³ and the thickness is not less than 15mm, its fire rating can be used directly without further testing. At the same time, the standard also specifies the level of smoke generation (s1-s3) and the risk level of burning droplets (d0-d3) to more comprehensively evaluate the combustion performance of fireproof plywood.
It should be noted that the fire rating of fireproof plywood is not absolute, and it is influenced by various factors such as production materials, production processes, surface coatings, and usage environments. Therefore, when choosing fire-resistant plywood, in addition to paying attention to its fire rating, other factors need to be comprehensively considered to ensure its safety and reliability in practical applications.
In short, fire-resistant plywood has different fire ratings, which are determined based on different standards and testing methods. When selecting and using fire-resistant plywood, the appropriate fire rating and material should be chosen based on specific application scenarios and requirements.