Flame-retardant aluminum plastic board refers to the selection of flame-retardant core materials for aluminum plastic board, and the combustion performance of the product reaches the refractory grade (class B1) or non-combustible grade (class A); At the same time, other performance indicators must also meet the technical specifications of aluminum composite panels.
The difference between B1 grade and A2 grade fire resistant panels is:
1.The ingredients of fire core materials are different:
For B1 grade plastic core, it contains: 55% – 55% flame retardant, the main ingredients are aluminum oxide (Al₂O₃) and magnesium oxide (MgO) ;
A2 grade plastic core material : It Contains 88% – 90% of the flame retardant, the main ingredients are aluminium hydroxide(Al(OH)3) and magnesium hydroxide (Mg(OH)2) ;
2.Different reactions to fire:
For B1 grade panels: When B1 grade panels are put on fire, it can be catched on fire after 5 minutes, and the fire will extinguish after 10 seconds when the fire leave the panels.
While for A2 grade fire rated aluminium composite panels, it can be catched on fire after 20 minutes, and the fire will extinguish immediately when the fire leave the panels.
3.Different testing indicators and requirements:
Testing indicators and requirements of B1 grade aluminium composite panel:
(1) According to GB/T8625-88 test, the average residual length of each set of specimens ≥ 150mm, (the remaining length of each specimen> 0), and the average peak temperature of each test flue gas temperature ≤ 200 °C;
(2) According to GB/T 8626-88 test, height index of flame tip <150mm, and the phenomenon of ignition of filter paper by burning drips is not allowed;
(3) According to GB/T8627-1999 test, smoke density rating (SDR) ≤ 75.
Testing indicators and requirements of A2 grade aluminium composite panel:
(1)According to GB/T 8625-88 test , the average residual length of each set of specimens ≥ 350mm (the remaining length of any specimen is > 200mm), and the peak value of the average flue gas temperature for each test ≤ 125° No burning phenomenon on the back of the specimen;
(2)According to GB/T8627-1999 test, smoke density rating (SDR) ≤ 15;
(3) According to GB/T14402-93 and GB/T14403-93 test, the thermal value of its material ≤ 4.2MJ/kg, the heat released per unit area of the test piece ≤ 16.8MJ/m2;
(4)According to GA 132–1996, the total non-lethal concentration of Lco in flue gas toxicity of burning materials is greater than or equal to 25.0 mg/L, and the mice will not die within 3 days after exposure and their weight will be recovered.