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They are widely used in buildings with stringent fire safety requirements, such as chemical plants, power stations, firewalls and roofs of high-rise buildings, hospitals, schools, stadiums, and airport terminals.
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Its most significant feature is the combination of excellent fire resistance (Class A non-combustible) and thermal insulation properties. It uses rock wool, made from natural minerals like basalt, as the core material, making it the preferred choice for locations with high fire safety requirements.
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Yes, in the context of building envelopes, "sandwich panel" is often a more descriptive term for "composite panel," specifically highlighting its "sandwich" layered structure. The two terms are generally interchangeable.
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Its core advantage is functional integration. It combines the building envelope (facings) and insulation/thermal (core) functions into a single unit, factory-produced, achieving an optimal blend of high performance and rapid construction.
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Common methods include: concealed clip systems (mainly for roofing, aesthetically clean), lap joints (used with sealant), and tongue-and-groove joints (for walls, providing a tight fit). The choice depends on the panel profile and waterproofing requirements.
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Because sandwich panels (typically with a polyurethane core) have extremely low thermal conductivity, offering superior insulation. They also provide excellent overall airtightness, effectively preventing thermal bridging, which maintains a constant temperature environment and reduces operating costs for cold storage.
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Fire performance is primarily determined by the core material. It is essential to check the core's fire rating certification (e.g., Chinese Class A non-combustible, B1 fire-retardant) and the fire test reports for the complete panel system. For example, rock wool sandwich panels typically achieve a Class A non-combustible standard.
