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Double-core gypsum board, so that the decomposition of formaldehyde can be seen! Strong adsorption + decomposition layer: blue colored layer added adsorption factor, can actively adsorb and decompose formaldehyde; decomposition layer: decomposition of formaldehyde additive can decompose formaldehyde into non-toxic and harmless inert carbohydrate, and remain in the board; With high gram weight paper, the gypsum board is stronger.