{"id":19896,"date":"2025-01-12T09:36:54","date_gmt":"2025-01-12T09:36:54","guid":{"rendered":"https:\/\/duksilicone.com\/?page_id=19896"},"modified":"2025-01-12T09:36:57","modified_gmt":"2025-01-12T09:36:57","slug":"how-to-cast-a-large-mold","status":"publish","type":"page","link":"https:\/\/duksilicone.com\/?page_id=19896","title":{"rendered":"How to Cast a Large Mold"},"content":{"rendered":"\n<ol class=\"wp-block-list\">\n<li>When casting a large mold, <strong>platinum cure silicone<\/strong> is a better option than <strong>tin cure silicone<\/strong>.<br>Tin cure silicone tends to shrink after curing (~0.3%), which becomes more pronounced in larger molds. In contrast, platinum cure silicone does not shrink upon curing, maintaining a stable size throughout.<\/li>\n\n\n\n<li>If you choose to use <strong>tin cure silicone<\/strong> for a large mold, here are some key suggestions:a) <strong>Don\u2019t add too much hardener<\/strong>: Excess hardener causes the silicone to cure too quickly, leaving you with insufficient time to pour it. We recommend a mixing ratio of <strong>100 parts silicone to 2-3 parts hardener by weight<\/strong> (not by volume). If the curing time is still too fast, you can try reducing the hardener to <strong>1-1.5%<\/strong> of the silicone weight. You can control the pot-life (working time) by adjusting the hardener ratio\u2014less hardener results in a longer pot-life, and more hardener shortens the pot-life.b) <strong>Use a mold release agent<\/strong> on the original model. Suitable release agents include wax, petroleum jelly (Vaseline), or soapy water.c) <strong>Vacuum degassing<\/strong> is essential before pouring the silicone. Failing to degas will trap bubbles in the mold, which weakens the mold\u2019s structure and can distort fine details from the original model.d) <strong>Ensure the mold is thick enough<\/strong> for optimal strength. A general guideline is that the mold should be at least <strong>3 cm thick<\/strong>.<\/li>\n<\/ol>\n\n\n\n<p>By following these steps, you can improve the quality and durability of your large silicone mold.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>By following these steps, you can improve the quality and durability of your large silicone mold.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-19896","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/duksilicone.com\/index.php?rest_route=\/wp\/v2\/pages\/19896","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/duksilicone.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/duksilicone.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/duksilicone.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/duksilicone.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=19896"}],"version-history":[{"count":1,"href":"https:\/\/duksilicone.com\/index.php?rest_route=\/wp\/v2\/pages\/19896\/revisions"}],"predecessor-version":[{"id":19897,"href":"https:\/\/duksilicone.com\/index.php?rest_route=\/wp\/v2\/pages\/19896\/revisions\/19897"}],"wp:attachment":[{"href":"https:\/\/duksilicone.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=19896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}