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Withdrawn HPDs

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  1. YTONG BLOCKS/YTONG S.A./2025-09-12

    Open the PDF · HPD 41810

    Expiration Date: 2028-09-12

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    YTONG BLOCKS are autoclaved cellular concrete comprising of sand, water and air. Air filled cells form during the manufacturing process. This air, in fact, constitutes the best imaginable thermal insulation in this manufacturing context…

  2. Expired: Brixx Modular Bricks and Pavers/Pittsburgh Mineral & Environmental Technology, Inc./2022-11-21

    Open the PDF · HPD 33686

    HPD has expired. Expiration Date: 2025-11-15

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    Pittsburgh Mineral & Environmental Technology, Inc. (PMET) has developed the Brixx technology to produce modular bricks and pavers. The products covered under this certification primarily consist of fly ash, bottom ash, and hydrated lime…