{"id":19902,"date":"2025-01-12T09:43:27","date_gmt":"2025-01-12T09:43:27","guid":{"rendered":"https:\/\/duksilicone.com\/?page_id=19902"},"modified":"2025-01-12T09:43:29","modified_gmt":"2025-01-12T09:43:29","slug":"why-does-silicone-get-oily","status":"publish","type":"page","link":"https:\/\/duksilicone.com\/?page_id=19902","title":{"rendered":"Why Does Silicone Get Oily?"},"content":{"rendered":"\n<p>Silicone rubber is commonly used for making molds across various industries, but sometimes, silicone molds exhibit an oily residue, which can be concerning. This issue, often referred to as &#8220;bleeding oil,&#8221; is a common question when customers seek technical advice.<\/p>\n\n\n\n<p>It&#8217;s important to note that silicone mold rubber itself does not contain oils, so the mold should not bleed oil by default. While a small amount of oil bleeding can be considered normal, it becomes problematic when large amounts of oil appear on the surface.<\/p>\n\n\n\n<p>The primary cause of oil bleeding in silicone molds is the use of too much silicone oil or the incorporation of a compound silicone oil mixture, which includes both silicone oil and white mineral oil, during the mold-making process. White mineral oil is a petrochemical and not pure silicone oil, and some manufacturers use this mixture as a cost-saving measure since pure silicone oil is more expensive than white mineral oil.<\/p>\n\n\n\n<p>To prevent oil bleeding and ensure high-quality silicone molds, it&#8217;s crucial to distinguish between pure silicone oil and ungraded silicone oil. Here are some key differences:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Visual and Olfactory Inspection:<\/strong> Ungraded silicone oil tends to be a turbid liquid with an unpleasant smell, whereas pure silicone oil is clear and odorless.<\/li>\n\n\n\n<li><strong>Burning Test:<\/strong> Ungraded silicone oil burns at around 100\u00b0C, while pure silicone oil has a much higher burning point of about 320\u00b0C.<\/li>\n\n\n\n<li><strong>Freezing Test:<\/strong> When exposed to temperatures as low as -50\u00b0C, pure silicone oil remains clear and transparent, whereas ungraded silicone oil may appear cloudy or change in consistency.<\/li>\n<\/ol>\n\n\n\n<p>Another reason for oil bleeding in silicone molds is the use of an excessive amount of curing agent (catalyst) during production. To avoid this, it&#8217;s recommended to reduce the curing agent ratio. Using too much curing agent can cause the silicone oil to bleed from the rubber.<\/p>\n\n\n\n<p>In summary, to avoid oil bleeding issues in silicone molds, it&#8217;s important to use high-quality, pure silicone oils and carefully monitor the amounts of curing agents and additives during the mold-making process.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Silicone rubber is commonly used for making molds across various industries, but sometimes, silicone molds exhibit an oily residue, which can be concerning. This issue, often referred to as &#8220;bleeding oil,&#8221; is a common question when customers seek technical advice. It&#8217;s important to note that silicone mold rubber itself does not contain oils, so the [&hellip;]<\/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-19902","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/duksilicone.com\/index.php?rest_route=\/wp\/v2\/pages\/19902","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=19902"}],"version-history":[{"count":1,"href":"https:\/\/duksilicone.com\/index.php?rest_route=\/wp\/v2\/pages\/19902\/revisions"}],"predecessor-version":[{"id":19903,"href":"https:\/\/duksilicone.com\/index.php?rest_route=\/wp\/v2\/pages\/19902\/revisions\/19903"}],"wp:attachment":[{"href":"https:\/\/duksilicone.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=19902"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}