Here is Thermal Isolation Glass Wool Factory talking about Insulation Grade.
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Insulation materials must not only focus on insulation performance, but also on fire performance. Here we list the fire rating of the exterior wall insulation, and the insulation of the interior wall is not listed first.
1. Insulation material with combustion performance of Class A: rock wool, glass wool, foam glass, foam ceramics, foamed cement, closed-cell perlite, etc.;
2. Insulation material with B1 grade combustion performance: extruded polystyrene board (XPS) after special treatment/polyurethane (PU), phenolic, rubber powder polyphenylene, etc. after special treatment;
3. Insulation materials with B2 grade combustion properties: molded polystyrene board (EPS), extruded polystyrene board (XPS), polyurethane (PU), polyethylene (PE), etc.
Class A insulation materials are only fireproof, and the insulation performance is not as good as organic XPS\EPS. I feel that the best insulation materials at present should be modified phenolic boards, which can meet the requirements of heat preservation and fire, but the unit price is also much more expensive. Insulation materials in the domestic market, each with its own shortcomings, or rooted in the needs of the building, consider
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