{"id":1740,"date":"2022-11-16T16:04:00","date_gmt":"2022-11-16T16:04:00","guid":{"rendered":"https:\/\/sybridge.com\/?p=1740"},"modified":"2024-01-29T19:24:45","modified_gmt":"2024-01-30T01:24:45","slug":"key-differences-acrylic-and-polycarbonate-machining","status":"publish","type":"post","link":"https:\/\/sybridge.com\/key-differences-acrylic-and-polycarbonate-machining\/","title":{"rendered":"Key Differences for Acrylic and Polycarbonate Machining"},"content":{"rendered":"\n<p class=\"has-sm-font-size\"><em>Previously published on fastradius.com on November 16, 2022<\/em><\/p>\n\n\n\n<p>Acrylic, also known as plexiglass or&nbsp;polymethyl methacrylate (PMMA), and&nbsp;polycarbonate&nbsp;are both lightweight, transparent plastics suitable for manufacturing parts via&nbsp;<a href=\"\/technologies\/cnc-machining\/\">CNC machining<\/a>. Acrylic is known for its strength and transparency, making it an excellent alternative to standard glass, whereas polycarbonate is incredibly tough and impact resistant, making it ideal for applications that require clarity as well as increased durability, such as safety glass.<\/p>\n\n\n\n<p>While acrylic and polycarbonate are similar in many respects, there are some important differences between these two common materials that can make one better suited for a particular application over the other, or impact the machining process and thus lead time and cost. In this article, we\u2019ll go over what you need to know about machining acrylic and polycarbonate so that you can select the best manufacturing option for your project and create designs that work with the material you choose.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-machining-acrylic-and-polycarbonate-what-you-need-to-know\">Machining Acrylic and Polycarbonate: What You Need to Know<\/h2>\n\n\n\n<p>When it comes to machining acrylic, cast acrylic is often a better choice than extruded acrylic, as the latter is more likely to crack or chip during the machining process. This means that the toolpath strategies sometimes need careful selection to avoid chipping the part. Additionally, since acrylics aren\u2019t very heat resistant, it\u2019s necessary to use a sharp cutting tool in order to obtain a smooth surface finish. Acrylic\u2019s low melting point means that it will also be necessary to use a lower cutting feedrate than other plastics during machining, since higher feedrates will generate more friction and heat, and potentially ruin your part. If necessary, acrylic may be kept in a freezer before machining to ensure that it remains as cool as possible.<\/p>\n\n\n\n<p>With its toughness and impact resistance, polycarbonate is better for machining and is particularly well-suited to&nbsp;<a href=\"\/technologies\/cnc-machining\/\">CNC milling<\/a>. However, when machining polycarbonate, the sharpness of the cutting tool is still important, as polycarbonate sheets can melt if too much heat builds up during the machining process. Since polycarbonate is less likely to chip than acrylic, it tends to be easier to machine and allows for more standard toolpath strategies to be used. In addition, because there is a higher temperature working range, more aggressive strategies can be used with a smaller chance of causing issues, potentially saving time and money.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-applications-for-acrylic-and-polycarbonate\">Applications for Acrylic and Polycarbonate<\/h2>\n\n\n\n<p>Both acrylic and polycarbonate are lightweight, machinable, and have unique characteristics that make them suitable for an array of applications across industries.<\/p>\n\n\n\n<p>Acrylic is a popular material within the&nbsp;automotive, construction, and&nbsp;aerospace&nbsp;industries, and is often used for things like dry boxes, lenses, radiation shields, and desiccators. Additionally, its transparency, strength, and high impact resistance make it a great alternative to glass, and you can commonly find it used in greenhouses, aquariums, terrariums, security barriers, and more.<\/p>\n\n\n\n<p>Like acrylic, polycarbonate is popular in the automotive, aerospace, and construction industries, but its resistance to heat and strong dimensional stability make it very popular in the&nbsp;medical industry, as polycarbonate parts can withstand limited autoclaves and irradiation sterilization. Among its more common applications, polycarbonate is often used for point-of-purchase retail displays, face shields, architectural features, clear manifolds, bulletproof windows, and much more.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-pros-and-cons-of-using-acrylic-for-your-parts\">Pros and Cons of Using Acrylic for Your Parts<\/h2>\n\n\n\n<p>Acrylic offers a range positive attributes, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Transparency:<\/strong>&nbsp;Acrylic can allow up to 92% of light to pass through it, making it more transparent than some grades of glass and most other <a href=\"https:\/\/sybridge.com\/common-thermoplastics\/\">thermoplastics<\/a>. It can also be colored without sacrificing its transparency, though it\u2019s possible to manufacture more opaque acrylic parts, as well.<\/li>\n\n\n\n<li><strong>Strength:<\/strong>&nbsp;Acrylic is much stronger and more impact resistant than glass. Most grades of acrylic are four to eight times stronger than glass.<\/li>\n\n\n\n<li><strong>Environmental resistance:<\/strong>&nbsp;Acrylic is naturally resistant to scratches, weathering, and UV radiation, making it ideal for outdoor applications.<\/li>\n\n\n\n<li><strong>Chemical resistance:<\/strong>&nbsp;Acrylic is resistant to many chemicals, including alkalis, detergents, cleaners, and dilute inorganic acids.<\/li>\n\n\n\n<li><strong>Moisture absorption:<\/strong>&nbsp;Acrylic has low moisture absorption, which allows it to retain its dimensions when used in outdoor applications.<\/li>\n\n\n\n<li><strong>Compatibility with coatings:<\/strong>&nbsp;Acrylic parts can be coated with anti-static, hard coat, or non-glare layers in order to improve their surface quality, extend their lifespan, and ensure they meet specific requirements.<\/li>\n\n\n\n<li><strong>Affordability:<\/strong>&nbsp;Despite its strength, durability, and clarity, acrylic remains relatively inexpensive to manufacture and machine. For comparison, polycarbonate is about 35 \u2013 40% more expensive.<\/li>\n\n\n\n<li><strong>Color:<\/strong>&nbsp;Acrylic is available in a wide range of colors.<\/li>\n<\/ul>\n\n\n\n<p>CNC machining acrylic is not without its disadvantages. As previously noted, acrylic is more susceptible to cracking and chipping than polycarbonate, and it\u2019s slightly more difficult to machine, since it will lose structural integrity and begin melting at temperatures over 160\u00b0C. When designing acrylic parts for CNC machining, you\u2019ll need to remember that relatively low melting point because it makes the material more susceptible to deformation during the manufacturing process. To avoid the risk of melting, and to achieve a quality surface finish, using a proper feed rate and pass depth is crucial. Similarly, to reduce chatter and achieve quality cuts, acrylic parts should be machined using tools with a short flute length and a cutting depth roughly half the diameter of the bit.<\/p>\n\n\n\n<p>Your product\u2019s intended use will also determine whether acrylic is the best option for your project. For example, acrylic\u2019s extreme biocompatibility makes it a good option for bone implants, dentures, or other skin-contact applications; similarly, its resistance to weather, UV radiation, and scratching make it a good fit for parts which will be used outdoors. On the other hand, acrylic might not be the best choice for&nbsp;food containers&nbsp;that will be exposed to high temperature environments, such as dishwashers or microwaves, since acrylic parts will only maintain their dimensions up to 149\u00b0F (65\u00b0C), at which point they begin to soften.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-pros-and-cons-of-using-polycarbonate-for-your-parts\">Pros and Cons of Using Polycarbonate for Your Parts<\/h2>\n\n\n\n<p>The positives of using polycarbonate include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Transparency:<\/strong>&nbsp;Polycarbonate is a naturally transparent thermoplastic that can transmit light just as effectively as glass, making it ideal for lenses, lighting, and bulletproof glass. Like acrylic, polycarbonate can be colored without sacrificing its transparency.<\/li>\n\n\n\n<li><strong>Variety:<\/strong>&nbsp;There are several formulations of polycarbonate on the market, including glass-filled and FDA-compliant variants, so it\u2019s likely that you\u2019ll be able to find one that meets your project\u2019s needs.<\/li>\n\n\n\n<li><strong>Strength and impact resistance:<\/strong>&nbsp;Polycarbonate has a tensile strength around 200 times that of glass, and is highly resistant to impact. Accordingly, it\u2019s often used in bullet-resistant glass and protective gear.<\/li>\n\n\n\n<li><strong>Shrinkage and dimensional stability:<\/strong>&nbsp;Polycarbonate will maintain its dimensions under most conditions, and has a low shrink rate of 0.6 \u2013 0.9%.<\/li>\n\n\n\n<li><strong>Environmental resistance:<\/strong>&nbsp;Polycarbonate is naturally resistant to UV radiation and can withstand varying moisture levels and fluctuating temperatures, which makes it an excellent material for outdoor applications and eyewear.<\/li>\n\n\n\n<li><strong>Chemical resistance:<\/strong>&nbsp;Polycarbonate is resistant to many chemicals, including diluted acids, oils, waxes, aliphatic hydrocarbons, alcohols, and greases.<\/li>\n\n\n\n<li><strong>Moisture absorption:<\/strong>&nbsp;Polycarbonate has slightly lower moisture absorption compared to acrylic.<\/li>\n\n\n\n<li><strong>Compatibility with coatings:<\/strong>&nbsp;Like acrylic, polycarbonate components can be coated with anti-static, hard coat, and non-glare layers. Polycarbonate is also compatible with UV and anti-fog layers.<\/li>\n\n\n\n<li><strong>High machinability:<\/strong>&nbsp;Since it\u2019s so durable and tolerant to heat, polycarbonate is easier to machine than acrylic.<\/li>\n<\/ul>\n\n\n\n<p>While polycarbonate has many positive attributes, there are some disadvantages to using polycarbonate for a CNC machining project, including its high cost and its susceptibility to denting. Additionally, since polycarbonate scratches easily, it\u2019s more likely to require&nbsp;<a href=\"\/technologies\/cnc-machining\/\">finishing<\/a>, which is complicated by the fact that only certain finishing processes, such as vapor polishing and coating, work with polycarbonate parts.<\/p>\n\n\n\n<p>Additionally, it\u2019s important to note that polycarbonate parts are also prone to developing sinks or voids in thicker sections. To prevent this, it\u2019s best to break thicker elements down into smaller, thinner sections to be assembled later. It\u2019s easy to remember this tip by keeping costs in mind \u2014 machining a thick part out of a single block of polycarbonate will typically be more expensive than working with smaller pieces due to the cost of the raw materials and the machining time.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-finishing-options-for-acrylic-and-polycarbonate\">Finishing Options for Acrylic and Polycarbonate<\/h2>\n\n\n\n<p>There are several finishing options available for acrylic and polycarbonate, including some that will help your parts look and feel ready for end-use applications and even improve clarity:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>As-machined finish:<\/strong>&nbsp;The standard and most economical finish, \u2018as-machined\u2019 or \u2018as-milled\u2019 means that no additional post-processing is applied to the part. As-machined parts have tight dimensional finishes and may represent a faster, more affordable manufacturing option. In some cases, as-machined parts may have small but visible surface tool marks, blemishes, or scratches.<\/li>\n\n\n\n<li><strong>Bead blasting:<\/strong>&nbsp;An economical finish that creates a uniform appearance,&nbsp;<a href=\"\/bead-blasting-right-finish-for-your-part\/\">bead blasting<\/a>&nbsp;tends to leave a dull or satin finish and is effective for removing tool marks and surface blemishes.<\/li>\n\n\n\n<li><strong>Vapor polishing:&nbsp;<\/strong>This finishing option uses solvent vapor to transform matte or opaque surfaces into smooth, high gloss, or optically clear surfaces. Vapor polishing is often used on parts where rough surfaces are unacceptable or where clarity is paramount.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>With sufficient care during the cutting process, machined surfaces of acrylic and polycarbonate parts will typically be translucent, but can become nearly opaque if the material melts. Should melting occur, it may be possible to address surface opacity with post-processing options such as vapor polishing. However, it\u2019s worth noting that as-machined finishes for acrylic and polycarbonate parts will not be optically clear, although it may be possible to achieve optical clarity if diamond tooling is used, but this must be specifically requested during the quoting process, as it will significantly add to cost.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-bottom-line-comparing-acrylic-and-polycarbonate-for-machining\">Bottom line: Comparing Acrylic and Polycarbonate for Machining<\/h2>\n\n\n\n<p>Special care should be taken with designs that include&nbsp;<a href=\"\/cnc-machining-acrylic-parts\/\">machined acrylic<\/a>&nbsp;due to the increased likelihood of stress cracking. With this in mind, it\u2019s advisable to use razor-sharp cutting tools to avoid melting the acrylic or causing cracking; diamond cutters yield the best surface finish, though carbide cutters are much more affordable. It will also be necessary to use a relatively fast feed rate to prevent the acrylic from melting, but remember that going too fast can cause extreme cutting pressure and breakage.<\/p>\n\n\n\n<p>While polycarbonate is generally better suited to machining thanks to its rigidity, toughness, durability, and higher melting point, the trade-off is that polycarbonate is less transparent than acrylic. However, if you need to create specific-use parts, such as protective gear, fuse boxes, or large, tough components, transparency may not be an issue. On the other hand, if you\u2019re designing a product for which transparency is a top priority, taking the extra effort to machine acrylic may be worth it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-bringing-your-part-designs-to-life-with-sybridge\">Bringing Your Part Designs to Life with SyBridge<\/h2>\n\n\n\n<p>Selecting a suitable material for your manufacturing project can be the difference between success and failure. While we\u2019ve explored the positives and negatives of acrylic and polycarbonate, it\u2019s worth remembering that they\u2019re not your only options. Numerous&nbsp;<a href=\"\/material-for-your-cnc-machining-project\/\">CNC machining materials<\/a>&nbsp;may be compatible with your part\u2019s design and intended application, and choosing the right one can be a complicated process.&nbsp;<\/p>\n\n\n\n<p>Fortunately, a manufacturing partner like SyBridge can reduce that complexity and address the challenges certain materials present. Beyond helping you decide whether acrylic, polycarbonate, or another material will work best for your part, our team can offer access to the tools and expertise you\u2019ll need to ensure production runs as smoothly and cost-efficiently as possible. And getting your project started is simple: just\u00a0<a href=\"https:\/\/app.sybridge.com\/\">create an account<\/a>\u00a0and upload your designs to get a quote for your parts instantly. Or, to learn more about how we can make your project possible,\u00a0<a href=\"\/contact\/\">contact us today<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Previously published on fastradius.com on November 16, 2022 Acrylic, also known as plexiglass or&nbsp;polymethyl methacrylate (PMMA), and&nbsp;polycarbonate&nbsp;are both lightweight, transparent plastics suitable for manufacturing parts via&nbsp;CNC machining. Acrylic is known for its strength and transparency, making it an excellent alternative to standard glass, whereas polycarbonate is incredibly tough and impact resistant, making it ideal for [&hellip;]<\/p>\n","protected":false},"author":20,"featured_media":1741,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[38],"tags":[82,63],"class_list":["post-1740","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","tag-cnc-machining","tag-materials"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Key Differences for Acrylic and Polycarbonate Machining - SyBridge Technologies<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sybridge.com\/key-differences-acrylic-and-polycarbonate-machining\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Key Differences for Acrylic and Polycarbonate Machining - SyBridge Technologies\" \/>\n<meta property=\"og:description\" content=\"Previously published on fastradius.com on November 16, 2022 Acrylic, also known as plexiglass or&nbsp;polymethyl methacrylate (PMMA), and&nbsp;polycarbonate&nbsp;are both lightweight, transparent plastics suitable for manufacturing parts via&nbsp;CNC machining. 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