The goal, when adhering to skin, is to hold the device inplace until it is time to remove it and to not damage the skin, either during wear or at the time of removal. Using methods developed for determining the surface energy of plastics and other materials, the surface energy for human skin has been measured in the low twenties [dynes/cm] – in other words, skin is as difficult to stick to as untreated polyolefins or even fluoropolymers. Low surface energy, as a property of human skin, is generally great for most of the things skin is expected to do, such as easy removal of contaminants with simple soap and water. The downside is that tapes must balance between adequate adhesion levels for the majority of users – the middle of the bell curve – and the ends of that curve. When the adhesion is too low, the device may not stay in place long enough for the full therapeutic effect and if it adheres too well, the tape may cause some mechanical trauma at removal.
Click here to read the rest of the article and the January newsletter.
In addition to the LSR, HCR, and RTV silicone materials that we work with on a day-to-day basis, silicone can take on a variety of physical forms, ranging from solids to water-thin liquids and semi-viscous pastes, greases and oils. Click here to read some interesting examples.
Last month Susan Windham-Bannister, Ph.D., President and CEO of Massachusetts Life Sciences Center, participated In the latest installment of the WBZ NewsRadio 1030 Business Breakfast series. The panelists of business leaders & experts discussed the importance of making products and profits in Massachusetts. The group also discussed how the state’s manufacturing sector is staging an epic turnaround. The event examined and discussed the stories behind manufacturing success and how the state is helping to foster this growth and the beneficial ripple effect it is creating for the Commonwealth and beyond.
Click here to watch the video of the Business Breakfast.
Click here to learn more about Massachusetts Life Sciences Center.
A cold deck (cold runner) system is an assembly of insulated feeding units that prevents liquid silicone from curing while conveying silicone into the cavities of the mold. The following are a few reasons that using a cold deck system can be very cost effective in high volume molding applications.
1. The cold deck eliminates waste (sprue and runners) that is generated in a conventional silicone injection molding.
2. The cold deck also reduces cycle time because it eliminates the need for a secondary process to remove the sprue and runner from the molded part.
3. A cold deck can also provide you with greater flexibility with both gate style (open vs. valve gated) and location.
Read the rest of Albright’s November newsletter.
Earlier this month Albright Technologies‘ Project Engineer, Matt Bont, gave a presentation at the Shin-Etsu Silicones Open House on Alternative Methods of Prototyping Liquid Silicone Parts.
Click here to view the presentation as well as other presentations from industry suppliers.
Click here to read the rest of the October newsletter.
Two common tests are (1) to put the device or component under pressure using regulated compressed air and then submerging in water or other fluid. The leaks will show as bubbles or (2) use a colored die solution that contrasts with your part colors under pressure and the die will highlight leaks.
Ultimately whenever possible pressure testing of the final assembly under the working load or more, in as close to the final environment as possible can help identify failures caused by condition stack up.
Alternatively for many applications there may be published standard test methods that have been shown to be effective. Medical devices and aerospace both have test standards and you may find some relevant test standards under ASTM.
Click here to learn more.
While it depends on the specific application, generally molded silicone parts will have a considerable life expectancy. Once fully cross-linked a silicone rubber part will be virtually inert, meaning it won’t degrade or react chemically with most anything in the environment, aggressive solvents can break silicone down. Compared to thermoplastic elastomers and other rubbers silicone tends to retain its physical properties for much longer periods of time, and over numerous cycles of use, hundreds, thousands, millions (again this is somewhat dependent upon the application).
Click here to read the full article.
Click here to read more or to register for the Open House on October 7, 2013.
The Massachusetts Life Sciences Center (MLSC) and the Massachusetts Neuroscience Consortium announced the first round of awards to fund research on neurological diseases since the consortium launched in 2012.
Click here to read article or visit Mass Life Sciences website for more information.