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Sheet copper.

Municipal Code of Chicago § 18-29-425.3.3
in effect
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18-29-425.3.3 Sheet copper. Sheet copper utilized for flush tank linings shall conform to ASTM B152 and shall not weigh less than 10 ounces per square foot (0.03 kg/m 2 ).
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2691254Fetched: 10/24/2026

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18-29-425.3.3 | Corpus