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Velderrain M.,Nusil Technology | Malave V.,Nusil Technology | Taylor E.W.,International Photonics Consultants, Inc.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

The improvement of silicone-based materials used in space and aerospace environments has garnered much attention for several decades. Most recently, an Ultra Low Outgassing™ silicone incorporating innovative reinforcing and functional fillers has shown that silicone elastomers with unique and specific properties can be developed to meet applications requiring stringent outgassing requirements. This paper will report on the next crucial step in qualifying these materials for spacecraft applications requiring chemical and physical stability in the presence of ionizing radiation. As a first step in this process, selected materials were irradiated with Co-60 gamma-rays to simulate the total dose received in near- Earth orbits. The paper will present pre-and post-irradiation response data of Ultra Low Outgassing silicone samples exposed under ambient air environment coupled with measurements of collected volatile condensable material (CVCM) and total mass loss (TML) per the standard conditions in ASTM E 595. The data will show an insignificant effect on the CVCMs and TMLs after exposure to various dosages of gamma radiation. This data may favorably impact new applications for these silicone materials for use as an improved sealant for space solar cell systems, space structures, satellite systems and aerospace systems. © 2010 Copyright SPIE - The International Society for Optical Engineering.

News Article | December 1, 2016
Site: www.marketwired.com

Corporate logo and brand identity are reflective of Avantor's position as a growing, global supplier of high-purity life sciences and advanced technologies materials CENTER VALLEY, PA--(Marketwired - December 01, 2016) - Avantor® Performance Materials, LLC., introduced a new corporate logo and visual identity today. The change comes two months after Avantor merged with NuSil™ Technology to form a growing, global supplier of ultra-high-purity life sciences and advanced technologies materials with strict regulatory and performance specifications. "Following the merger of Avantor and NuSil Technology, we needed to give our company a fresh look that reflects our corporate evolution and global footprint," said Michael Stubblefield, CEO of Avantor. "With input from customers and other key stakeholders, we developed a logo and corporate identity that aligns with the value we offer our global customers." The most striking element of the new corporate logo is a symbol called the "petals of life," which flows from the corporate name and is a direct homage to Avantor's focus on collaborative innovation and working with customers to solve their business challenges at any scale. "Avantor is known for our unique approach to identifying and solving the specific business and operational challenges faced by our global customers," continued Stubblefield. "We develop custom solutions and connect customers with the right, high-quality products to meet their unique needs. Our new corporate logo is emblematic of this collaborative approach to innovation and problem-solving." Avantor provides performance materials and solutions for the production and research needs of more than 6,500 customers across the biotechnology, pharmaceutical, medical device, diagnostics, aerospace and defense, and semi-conductor industries. The company offers a portfolio of more than 30,000 products that meet increasingly stringent standards across technology-driven and highly-regulated markets. The new corporate logo will be rolled out methodically over the coming months on all company platforms, including facility signage, web properties, promotional materials, product labels and documentation. The change to the corporate logo will have no impact whatsoever on product quality or specifications, product availability or service delivery performance. To learn more about Avantor, please visit www.avantormaterials.com. Avantor is a global supplier of ultra-high-purity materials for the life sciences and advanced technology markets. The company provides performance materials and solutions for the production and research needs of more than 6,500 customers across the biotechnology, pharmaceutical, medical device, diagnostics, aerospace & defense, and semiconductor industries. Avantor's product portfolio includes more than 30,000 products that meet increasingly stringent standards across technology driven and highly regulated markets. Avantor manufactures and markets its products around the world under several respected brand names. Avantor's brands of performance chemistries include the J.T.Baker®, Macron Fine Chemicals™, Rankem™, BeneSphera™, and POCH™ brands. Avantor's brands of advanced silicones include the NuSil™ and CareSil brands. For more information visit www.avantormaterials.com.

Velderrain M.,NuSil Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

Unprotected electronic components exposed to moisture from high humidity may fail due to corrosion of metal leads or other unfavorable reactions on chemically sensitive components. This is of high interest for silicones that encapsulate Light Emitting Diodes (LEDs) dies. For these applications, moisture and oxygen may react with materials, such as phosphor, used to make white LEDs for back-lighting applications and decrease or change the light output and color over time. Of the polymeric adhesives and sealants commercially available, silicones are used for their thermal stability, clarity, and comparably low modulus that provides stress relief during thermal cycling. In addition, silicones are also known to be very permeable to low molecular weight gases such as water vapor and oxygen. Recently, several types of silicones were tested for the oxygen and water vapor transmission rates, and it was found that they can have drastically different results. Silicone properties strongly affecting permeability are polymer backbone chemistry, crosslink density and fillers. Phenyl (C 6H 5) and trifluoropropyl (CF 3CH 2) groups are used to optimize the refractive index of optically clear silicones. The effect of chemical composition on the water vapor transfer rate (WVTR) and the oxygen transfer rate (OTR) at 40 0 C and 90% Relative Humidity was investigated on several silicones with various refractive indices and compared to polydimethylsiloxane (PDMS) with similar durometers. It was found that polymer backbone chemistry had a significant influence on the permeation rates and will assist in material selection when designing for low-permeable barriers to improve package reliability. © 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Burkitt B.W.,NuSil Technology | Thomaier R.V.,NuSil Technology | Riegler B.B.,NuSil Technology | Malave V.,NuSil Technology
International SAMPE Symposium and Exhibition (Proceedings) | Year: 2010

Silicones have been formulated and manufactured for aircraft, aerospace, engineering and healthcare applications for over fifty years. These silicone materials range from adhesives, sealants and coatings that have contact angles of 98° to 109°. Materials with contact angles greater than 90° are considered hydrophobic and are used in a myriad of industries. Hydrophobic/ Ice-Phobic silicone coatings have been found to be very beneficial to prevent the build up of ice on aerodynamic and control surfaces in preflight and in-flight operations, which can create an increase in drag and decrease in lift.

Growth in the solar industry has resulted in newer technologies, specifically concentrator photovoltaic (CPV) modules, to explore using new types of materials such as silicone encapsulants. CPV and LCPV module designs are to achieve the most efficient energy conversion possible however it is equally important to demonstrate long term reliability. Silicone is a material of interest due to its thermal stability and ability to absorb stresses incurred during thermal cycling. The refractive index of clear silicone adhesives is advantageous because it can be optimized using phenyl groups to match BK7 glass and other substrates to minimize light loss at the interfaces but it is relatively unknown how the optical properties change over time possibly yellowing in such a harsh environment. A 1.41 silicone encapsulant is compared to a 1.52 refractive index silicone. Optical Absorption (300 nm-1300 nm), Water Vapor Permeability, Moisture Absorption and effects of oxidation at elevated temperatures will be compared of these materials to aid the engineer in choosing a silicone for their CPV application. Non-phenyl containing 1.41 RI silicones have been used for several years for bonding solar arrays in the satellite industry. Phenyl groups on the siloxane polymer can change various properties of the silicone. Understanding how phenyl affects these properties allows the engineer to understand the benefits and risks when using a RI matching silicone to minimize light loss versus a non-phenyl containing silicone. © 2011 American Institute of Physics.

Burkitt B.,NuSil Technology
Rubber World | Year: 2012

Fluorosilicone's advent into the commercial marketplace offers opportunities for manufacturers to pursue new applications for silicones in the automotive, aircraft and general markets. The unique properties of fluorosilicones provide a solution for products that need broad operating temperatures, fuel resistance and long-term reliability. Initially, the silicone polymer is produced, and silica is added as a reinforcing filler to improve the physical properties of the elastomer. This mixture is called a base. Acting similarly to gravel in concrete, silica reinforces the cured silicone polymers through van der Waals forces and hydrogen bonding between hydroxyl groups on the silica surface and the siloxane backbone of the polymer. Within the flurosilicone family, several formulations are available that can be adjusted to fit specific applications. The breadth of material choices for these types of applications is attributable to advances in fluorosilicone technology based on trifluoropropyl methylpolysiloxane polymers.

Reilly B.,NuSil Technology
Rubber World | Year: 2012

Not only are there many different types of adhesives, there are also several types of silicone adhesives. Your choice of a silicone adhesive, whether a one part RTV adhesive, a two part adhesive, a film adhesive or a pressure-sensitive adhesive, should depend on the substrates you are using and the application(s) you are undertaking. While silicone adheres well to a variety of substrates on its own, primers and other preparations do help improve adhesion. Because finding the most suitable adhesive and/or primer can be difficult, NuSil offers custom formulation of primers and adhesives, as needed. Especially when communicating unique requirements, having a good relationship with your material supplier can be helpful.

Malave V.,NuSil Technology | Burkitt B.,NuSil Technology | Riegler B.,NuSil Technology | Johnson R.,NuSil Technology | Thomaier R.,NuSil Technology
Journal of Spacecraft and Rockets | Year: 2011

Silicone materials for space and aerospace applications are continually in development and evaluation to limit and reduce the potential for outgassing contamination while maintaining essential physical and chemical characteristics. Several agencies, such as NASA, historically recommend the American Society for Testing and Materials ASTM E595 ["Standard Test Method for Total Mass Loss and Collected Condensable Materials from Outgassing in a Vacuum Environment," ASTM International, Std. ASTM E595, Alexandria, VA, 2007] test results of less than or equal to 1.0% total mass loss and less than or equal to 0.1% collected volatile condensable material. These levels provide an industry screening level for the acceptance or rejection of controlled- volatility materials for space applications. By a comparison of controlled-volatility product CV10-2568 and ultra-low-outgassing product SCV-2585, cured physical properties and outgassing profiles of these two products demonstrate that when incorporating specific fillers, the cured physical properties can remain consistent while still providing exceptional outgassing characteristics. Copyright © 2010 by the American Institute of Aeronautics and Astronautics, Inc.

Poliskie G.M.,NuSil Technology | Naggs R.,NuSil Technology
Rubber World | Year: 2015

Solar panel manufacturers and light emitting diode (LED) manufacturers perform a number of reliability tests in order to provide a 10 to 20 year warranty for their products. Silicone is used as an optical component in LEDs to guide light out of the device, and it is used in solar panels to guide light into the device. Successful operation in both applications requires the silicone?s optical performance to remain constant after years of field operation. Isothermal stability is a measurement of the silicone?s ability to maintain optical clarity without signs of discoloration at high temperatures for long durations.. The silicone?s ultraviolet-visible (UV-Vis) spectrum is a commonly used predictor of the material?s performance as an optical component. There is a range of wavelengths of interest for LED and solar panel manufacturers.

Velderrain M.,NuSil Technology | Lindberg M.,NuSil Technology
44th International Symposium on Microelectronics 2011, IMAPS 2011 | Year: 2011

Silicones have been used for decades in aerospace and other harsh environments where temperature extremes are common. As the level of sophistication increases for electronic devices to serve these industries where failure is not an option, the material supplier has to also be able to meet these needs. Silicones are polymeric materials composed primarily of repeating silicon and oxygen bonds, known as siloxanes, which can be optimized for various chemical and physical properties by incorporating different organic groups onto the silicon atom. Employing advanced processing techniques to the siloxane system can also greatly reduce mobile siloxane molecules to reduce contamination that can cause electronic failures during assembly or operation. Siloxane based polymeric systems are also unique polymers compared to standard organic based materials in that they have a large free volume that imparts a low modulus which absorbs stresses during thermal cycling as well as not degrading at continuous operating temperatures up to 250 C. They are also slightly polar which allows the incorporation of fillers to impart a variety of unique properties. Filler technology is also a rapidly growing enterprise where fillers with various particle sizes and shapes can be added to silicones to impart key properties such as maintaining electric conductivity at elevated temperatures. This paper will explain fundamentals of silicone chemistry and processing related to getting the optimal performance in harsh environments. A case study comparing two different electrically conductive fillers and how they can influence the electrical conductivity at elevated temperatures will be presented.

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