{"id":1575,"date":"2010-01-21T14:13:29","date_gmt":"2010-01-21T19:13:29","guid":{"rendered":"https:\/\/www.ulprospector.com\/knowledge\/?p=1575"},"modified":"2018-02-09T14:06:05","modified_gmt":"2018-02-09T20:06:05","slug":"pe-choose-resin-plastic-part","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/1575\/pe-choose-resin-plastic-part\/","title":{"rendered":"How To Choose A Resin For A Plastic Part"},"content":{"rendered":"

By Protomold<\/a> – Nobody’s Faster In The Short Run.\u00ae<\/p>\n

Choosing a resin for a plastic part can be as important (and challenging) as designing the part itself. You can spend all the time in the world poring over information in books or on the web, but you may not know for certain that the resin you\u2019ve chosen is the right one for the job until you make and test some prototypes.<\/p>\n

Of course there are times when the choice of resins is obvious, when there is some special requirement that overshadows all others and only one product will do. On the other hand, there are applications in which the requirements aren\u2019t very challenging and any of a number of resins would meet the need. More often, however, the choice of resins is a matter of balancing competing demands and finding just the right combination of cost, cosmetics, moldability, and performance. In such cases there may be several serious contenders when you\u2019re ready to start making prototypes. The challenge is choosing the best all-around material for the application before you commit to full-on production.<\/p>\n

\"Figure
\nUsing the same 3D CAD model, multiple material prototype part samples were injection molded for product testing.<\/div>\n

Statistics on a resin datasheet can help narrow the choices, but in a competitive market there\u2019s really no such thing as “good enough.” And while the difference between just the right resin and the second-best choice may be small, when multiplied by a production run of 100,000 pieces, time and energy invested in finding the right product can bring substantial returns. The challenge is to find a way of effectively comparing the “finalists” to find the one best resin for your particular part.<\/p>\n

The traditional way to make this decision is to choose a resin, make some prototypes, evaluate the resulting parts, and decide whether to stay with that choice or try another. The problem is that your first choice may seem perfectly adequate until you compare it with something better. And with deadlines looming, as they usually do, “perfectly adequate” can be tempting, especially when further exploration costs time and money. There is, however, an alternative that won\u2019t squeeze your budget or put you off schedule.<\/p>\n

Instead of trying resins sequentially, have several versions of your prototype made at the same time and test them side-by-side. This can be done either by machining or molding prototypes.<\/p>\n

1. To begin, first make sure that your design is injection moldable before you move forward with prototyping. You can do this by uploading a 3D CAD model to receive a ProtoQuote, which includes a design analysis that can help identify potential moldability problems before you commit to the cost of prototyping.<\/p>\n

2. If you want to compare resins with significantly different shrink coefficients, you can have prototypes machined from solid resin by First Cut. These will all have the required dimensions so they can be easily compared, fitted into assemblies, etc. This should allow you to at least reduce the resin choices to a set with similar shrink coefficients.<\/p>\n

If you\u2019ve narrowed down your resins to a set with similar shrink coefficients or if your tolerances are not particularly tight, you can then use Protomold to injection mold your prototypes. Keep in mind that each mold is manufactured with a shrink coefficient. For this reason, if you need to use a different resin and its shrink coefficient is different, a new mold may have to be cut (hence the above advice to consider First Cut CNC machining first).<\/p>\n

The sequential use of First Cut CNC machining followed by Protomold injection molding will help you fully explore your resin options while avoiding excessive tooling costs, and the additional production time for molding parts in more than one resin will be negligible\u2014probably just a matter of hours. The information you\u2019ll get can be invaluable. Specifications cannot tell you precisely how a resin will function in your particular design, which is why we make prototypes. For a small incremental cost you can answer questions such as: how does your part look in apple red versus lemon yellow? How opaque is each resin at a particular point in the design? How does it stand up to a three-foot fall, a sharp rap with a ball-peen hammer, or an hour in a closed car on a sunny afternoon? How much glass fill does it really need to meet your strength goals? Will it warp or sink?<\/p>\n

With parts in several resins you can get right down to serious comparative testing and stay on schedule while you let your customers take a look at them, check their mechanical properties, evaluate their fit with other parts, test them in different environments, etc. This approach lets you test resins against one another, instead of simply against expectations, and see which one really delivers the best combination of characteristics. You may find that you can actually exceed expectations, and that\u2019s always good.<\/p>\n

In short, multi-resin prototyping has a lot of advantages and very small incremental costs. The only stipulation, as mentioned earlier, is that truly equivalent parts from a single mold require the use of resins with similar shrink coefficients. If, on the other hand, you want to compare parts made of resins with different shrink coefficients you can easily do so using First Cut\u2019s automated machining.<\/p>\n

If you have questions about how to effectively explore multi-resin molding, feel free to speak with Proto Labs customer service engineers at 763.479.3680.<\/p>\n","protected":false},"excerpt":{"rendered":"

By Protomold – Nobody’s Faster In The Short Run.\u00ae Choosing a resin for a plastic part can be as important (and challenging) as designing the part itself. You can spend all the time in the world poring over information in … Continued<\/a><\/p>\n","protected":false},"author":20,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"episode_type":"","audio_file":"","podmotor_file_id":"","podmotor_episode_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","footnotes":"","_ppma_block_editor_authors":""},"categories":[29,21],"tags":[28,276],"ppma_author":[1237],"class_list":["post-1575","post","type-post","status-publish","format-standard","category-processing","category-plastics-2","tag-protomold","tag-processing","entry"],"yoast_head":"\nHow To Choose A Resin For A Plastic Part - Prospector Knowledge Center<\/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:\/\/ulprospector.ul.com\/1575\/pe-choose-resin-plastic-part\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How To Choose A Resin For A Plastic Part - Prospector Knowledge Center\" \/>\n<meta property=\"og:description\" content=\"By Protomold – Nobody’s Faster In The Short Run.\u00ae Choosing a resin for a plastic part can be as important (and challenging) as designing the part itself. 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