The flame retardant grade of cloth bag air duct is divided into several grades

The flame retardant grades of cloth bag air ducts are divided into the following categories: 1). Grade A, non-burning material, 2.B1, difficult to burn material, 3.B2, burnable material, 4.B3, easy to burn material. For materials that meet the following requirements, their incineration function is rated as B1. 2) Tested according to GB/T 8626, its incineration performance should reach the target specified in GB/T 8626 and the phenomenon of burning droplets to ignite the filter paper is not allowed; 3). Tested according to GB/T 8625, each group The average remaining length of the test piece is ≥15cm (the remaining length of any test piece is >0cm), and the average flue gas temperature peak value of each test is ≤200°C. 4). According to GB/T 8627, the smoke density grade (SDR) is less than or equal to 75.

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