<?xml version="1.0" encoding="UTF-8" standalone="no"?><?Xpress productLine="ncc-clause" ?><clause id="_33c5f9a6-a771-4cda-add6-bc8d209e3d5b" outputclass="ncc-clause"><sptc>S2C22</sptc><title id="_9175b5bf-1003-4f94-ba6f-b9afa2855b90">Hollow terracotta blocks</title><archive-num>2019: Sch. 5 (Annex): 10</archive-num><subclause id="_53dc5a76-f9fb-4478-9b99-42191543ef11" outputclass="subclause"><title id="_1267a6dd-7921-4ee9-85b4-7db0d405c5c4">SubClause</title><num>1</num><p>The proportion of cored holes or perforations in a hollow terracotta block (based on the overall rectangular volume of the unit) must not exceed the following:</p><ol outputclass="alpha"><li id="_baa60c2d-d967-4f94-8d60-1b12ebad0f14">For blocks up to 75 mm thick — 35%.</li><li id="_6545cf61-2418-468e-88cb-87bd1716ba4f">For blocks more than 75 mm but not more than 100 mm thick — 40%.</li><li id="_1e327bf9-4740-4c50-8c18-dcf1c6301962">For blocks more than 100 mm — 50%.</li></ol></subclause></clause>