Acoustic requirements: NRC: ≥ 0.8, surface is sprayed flat without dots. Environmental performance requirements: free from harmful and toxic substances such as lead, mercury, naphthalene, asbestos, etc., odorless, in compliance with national E1 level environmental protection requirements, and free of radioactive substances; Thickness: 20mm, 25mm, 30mm, 40mm, 50mm Conventional sizes: 600mm x 600mm, 600mm x 1200mm
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