Document Archives

Minimum Equivalent Thickness and Approximate Face Shell Thickness Requirements for Class B-4 Concrete Blocks Made from Pumice Concrete

  • ID:

    76

  • ESCSI:

    3220.035

  • Author:

    Underwriters' Laboratories

  • Publication Name:

    Memo to Manufacturers of Class B-4 Pumice Concrete Blocks

  • Type of Publication:

  • Publisher:

    Underwriters' Laboratories

  • Dated:

    1972

  • Issue/Volume:

    May 22

  • Other ID:

  • Page(s):

    1-3

  • Reference List:

    N
  • Abstract:

    Memo notifies manufacturers of Class B-4 Pumice Concrete Blocks that Follow-Up Service Procedures and Concrete Block Classification Cards would be revised within 90 days from May 22, 1972 to show all currently classified pumice concrete blocks as Class D-2 units unless existing units or new block designs have demonstrated compliance with new requirements.UL then offers to run the tests on newly submitted blocks.