{"id":330,"date":"2025-07-16T08:13:33","date_gmt":"2025-07-16T08:13:33","guid":{"rendered":"https:\/\/tuoyuan.waituo.tech\/specific-gravity-definition-acrylic-comparison-applications\/"},"modified":"2025-07-16T08:13:33","modified_gmt":"2025-07-16T08:13:33","slug":"specific-gravity-definition-acrylic-comparison-applications","status":"publish","type":"post","link":"https:\/\/tuoyuan.waituo.tech\/pt\/specific-gravity-definition-acrylic-comparison-applications\/","title":{"rendered":"What is Specific Gravity? Definition, Measurement, and Application in Acrylic Products"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1312\" height=\"736\" src=\"https:\/\/tuoyuan.waituo.tech\/wp-content\/uploads\/2025\/07\/4bde86452d8b4ef695c364427f60d01c.webp\" alt=\"Specific Gravity Infographic\" class=\"wp-image-329\" srcset=\"https:\/\/tuoyuan.waituo.tech\/wp-content\/uploads\/2025\/07\/4bde86452d8b4ef695c364427f60d01c.webp 1312w, https:\/\/tuoyuan.waituo.tech\/wp-content\/uploads\/2025\/07\/4bde86452d8b4ef695c364427f60d01c-300x168.webp 300w, https:\/\/tuoyuan.waituo.tech\/wp-content\/uploads\/2025\/07\/4bde86452d8b4ef695c364427f60d01c-1024x574.webp 1024w, https:\/\/tuoyuan.waituo.tech\/wp-content\/uploads\/2025\/07\/4bde86452d8b4ef695c364427f60d01c-768x431.webp 768w\" sizes=\"(max-width: 1312px) 100vw, 1312px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" >Defini\u00e7\u00e3o de uma frase<\/h2>\n\n\n\n<p>Specific gravity is a dimensionless ratio that compares the density of a material to the density of water, commonly used to assess whether a material is lighter or heavier than water.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >Explica\u00e7\u00e3o pormenorizada<\/h2>\n\n\n\n<p>Specific gravity (SG), also known as relative density, is calculated by dividing the density of a substance by the density of water (typically at 4\u00b0C or 23\u00b0C for plastics). Unlike density, which has units (e.g., g\/cm\u00b3), specific gravity is unitless, making it easy to compare materials regardless of measurement system. If a material\u2019s specific gravity is less than 1, it will float on water; if greater than 1, it will sink. This property is crucial in material selection, quality control, and product design, especially in the plastics and acrylic industry.<\/p>\n\n\n\n<p><strong>Measurement Standards:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><strong>ASTM D792<\/strong> and <strong>ISO 1183<\/strong> are the primary standards for determining the specific gravity of plastics, including acrylic. The most common method involves weighing a specimen in air and then in water, using the difference to calculate SG. <a href=\"https:\/\/www.intertek.com\/polymers-plastics\/testlopedia\/density-and-specific-gravity-astm-d792\/\" rel=\"nofollow\">Learn more about ASTM D792<\/a><\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >Componentes principais<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><strong>Density of the Material:<\/strong> Mass per unit volume, measured in g\/cm\u00b3 or kg\/m\u00b3.<\/li>\n<li><strong>Reference Density:<\/strong> For solids and liquids, this is the density of water (1.0 g\/cm\u00b3 at 4\u00b0C).<\/li>\n<li><strong>Temperature Control:<\/strong> Both the sample and water must be at a specified temperature for accurate results.<\/li>\n<li><strong>Measurement Method:<\/strong> Typically, the water displacement method (ASTM D792) is used for plastics.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >Practical Applications in Acrylic Products<\/h2>\n\n\n\n<p>Specific gravity directly impacts the weight, handling, and application of materials. For example, acrylic (PMMA) has a specific gravity of about <strong>1.19<\/strong>, making it much lighter than glass (<strong>~2.5<\/strong>), and similar to polycarbonate (PC, <strong>~1.20<\/strong>) and polystyrene (PS, <strong>~1.05<\/strong>). This lower weight means acrylic products are easier and safer to transport, install, and use\u2014an important advantage for display racks, storage boxes, and protective covers.<\/p>\n\n\n\n<p><strong>Comparison Table: Specific Gravity of Common Materials<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n\n<thead>\n<tr><th>Material<\/th><th>Specific Gravity<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>Acrylic (PMMA)<\/td><td>1.17 \u2013 1.20<\/td><\/tr>\n<tr><td>Glass<\/td><td>~2.5<\/td><\/tr>\n<tr><td>Polycarbonate<\/td><td>1.18 \u2013 1.22<\/td><\/tr>\n<tr><td>Polystyrene<\/td><td>1.04 \u2013 1.08<\/td><\/tr>\n<\/tbody>\n\n<\/table>\n<\/figure>\n\n\n\n<p><em>Source: <a href=\"https:\/\/www.specialchem.com\/plastics\/guide\/density\" rel=\"nofollow\">SpecialChem Plastics Guide<\/a><\/em><\/p>\n\n\n\n<p><strong>Case Example:<\/strong>\nAcrylic display stands from <a href=\"https:\/\/www.toyinltd.com\/\">Toyin Acrylic Products Co., Ltd. (TOYIN)<\/a> are significantly lighter than glass alternatives, reducing shipping costs and installation risks while maintaining excellent clarity and durability. This makes acrylic the preferred choice for retail, office, and home applications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >Conceitos relacionados<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><strong>Density:<\/strong> Mass per unit volume; has units (g\/cm\u00b3).<\/li>\n<li><strong>Water Absorption:<\/strong> The amount of water a material can absorb, affecting weight and performance.<\/li>\n<li><strong>Mechanical Strength:<\/strong> The ability of a material to withstand forces without breaking.<\/li>\n<li><strong>Transparency:<\/strong> Important for display and protective applications.<\/li>\n\n<\/ul>\n\n\n\n<p>For more on these topics, see <a href=\"https:\/\/www.tekra.com\/resources\/tek-tip-white-paper\/tek-tip-defining-density-vs-specific-gravity\" rel=\"nofollow\">Density vs. Specific Gravity<\/a> and <a href=\"https:\/\/www.mt.com\/us\/en\/home\/applications\/Application_Browse_Laboratory_Analytics\/Density\/what-is-specific-gravity.html\" rel=\"nofollow\">MT.com: What is Specific Gravity?<\/a>.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<p><strong>Looking for lightweight, high-quality acrylic products for your next project?<\/strong>\nExplore custom solutions from <a href=\"https:\/\/www.toyinltd.com\/\">TOYIN Acrylic Products Co., Ltd.<\/a>\u2014your global partner for innovative acrylic displays, storage, and more.<\/p>","protected":false},"excerpt":{"rendered":"<p>Learn the definition of specific gravity, how it\u2019s measured (ASTM D792\/ISO 1183), and why it matters for acrylic products. Compare acrylic, glass, PC, and PS by specific gravity, and discover real-world applications in display, storage, and protective covers. Ideal for material selection, product design, and cost-saving decisions.<\/p>","protected":false},"author":3,"featured_media":329,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-330","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Specific Gravity? Definition, Acrylic Comparison &amp; Applications<\/title>\n<meta name=\"description\" content=\"Learn the definition of specific gravity, how it\u2019s measured (ASTM D792\/ISO 1183), and why it matters for acrylic products. 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