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1.1 ,This specification covers faced or unfaced, rigid cellular phenolic thermal insulation. Boards shall be faced or unfaced. Tubular forms and board cut from a block or bun covered by this standard shall be unfaced. It does not apply to field expanded cellular phenolic materials.
Note 1: ,If a facer or vapor retarder is to be used for the tubular form or board, then refer to Practice C921.