For long-term durability and extend product life-cycles consider using NOVAGARD® Silicones UV cured potting compounds to improve and maintain leak prevention and corrosion resistance in pin connector assemblies subjected to harsh environments.
Use of any Novagard Solutions™ trademark is not permitted without prior written permission. As manufacturers continue to search for faster more efficient production techniques the staff at NOVAGARD® Silicones strives to remain at the forefront of technology and produce materials that meet the ever increasing demands. Eliminate mixing of two-component materials and oven cure cycles by using UV cured potting and encapsulating compounds from NOVAGARD® Silicones to safeguard delicate electronic elements.
Coatings from NOVAGARD® Silicones will protect components from environmental extremes, provide barrier properties for sensitive electronics, or change the look and feel of a fashion. NOVAGARD® Silicones UV cured sealants can eliminate racking of parts and reduce your processing times and yet still deliver the performance advantages of conventional silicones. Ellsworth Adhesives Glue Doctors include our Engineering Sales Representatives and Technical Service personnel. Silicone elastomers are high-performance thermoset materials broadly used in diverse industries, including automotive, aerospace, electronics, consumer goods, and health care. Mike Boivin To get a better idea of the importance of New England Catheter's capabilities for medical device customers, Medical Design Briefs spoke with Mike Boivin, manufacturing manager at New England Catheter. They are recognized for their unique combination of properties, including high heat resistance, physiological inertness, and excellent electrical properties.
7,105,584), ultraviolet-energy cure chemistry exclusively available from NOVAGARD® Silicones, the 800 Series products combine the performance advantages of silicone with processing speeds of UV cure.
Key extruder components include a feedbox, barrel, screw, and tooling.Silicone elastomers are typically cured by peroxide initiated free radical polymerization of methylvinyl polysiloxanes, and alternatively, by hydrosilylation using silicon hydride crosslinking agents.

Both of these curing mechanisms require elevated temperatures to obtain an effective degree of cure of the silicone elastomer. In particular, extrusion is a process that provides continuous profile of a specific cross-section (such as tubing), which is then vulcanized by passing through a heated air tunnel typically at temperatures of 800 °F to 1200 °F. This leads to high energy usage during vulcanization and generation of substantial waste heat. In comparison, ultraviolet (UV) curing is a photochemical process where UV radiation is used only to initiate the catalytic curing reaction, thereby reducing energy consumption.
Since silicone is a UV transparent material, only the photosensitive catalysts absorb the UV radiation, so there is little production of waste heat.Momentive Performance Materials Inc.
This approach employs a photosensitive platinum catalyst, which, upon exposure to UV light, initiates the hydrosilylation reaction needed to cure the silicone rubber. The reaction proceeds vigorously at temperatures below 140 °F without substantial heat input. Traditional silicone elastomers can be readily modified to be compatible with this UV curing system, but Momentive also introduced the Addisil* UV 60 EX elastomer to specifically utilize the UV curing process.
The process was demonstrated in a pilot scale extrusion trial at a Momentive Performance Materials laboratory in Waterford, NY. As displayed above in Table 1, the UV cured silicone elastomer offered properties comparable to those of a similarly prepared thermally cured elastomer.The UV cure technology may allow energy savings and increased extrusion speed while maintaining the classic properties of silicone elastomers. As the cure is initiated through UV radiation, the degree of cure from skin to the core of the three-dimensional product is uniform, which allows high-speed extrusion of thick wall tubing and profile free from common defects such as internal porosity.
The UV exposure time for the cure can be as short as 0.5 seconds, and a 10-inch length UV lamp will allow extrusion of silicone tubing at three to five times the rate of existing thermal curing systems.

Since the cure occurs at relatively low temperature (under 140 °F), this new technology opens up the possibility of co-extrusion of silicones with other temperature-sensitive materials such as polyolefin and thermoplastic elastomers. Such co-extrusion is not possible with traditional thermally cured silicone elastomers.Processing Advantages of UV CuringSpecialty Silicone Fabricators (SSF) (Paso Robles, CA) successfully trialed Momentive UV materials by extruding single and multi-lumen tubing with various wall thicknesses.
SSF holds patents related to their Geo-Trans®* process technology, which employs computer aided sequencing that allows extrusion tooling, including the die and mandrel, to be manipulated such that cross-sectional geometries can be changed in fractions of a second within a short section of tubing. 2.This Geo-Trans tube provided an important opportunity to evaluate the Momentive material and the UV process.
SSF engineers were able to completely vulcanize the tube roughly 3? faster than with traditional thermal curing.
In another example, relatively simple single lumen tubing was vulcanized at 100 feet per minute. 2 – Specialty Silicone Fabricators' GeoTrans tube provided a test case for evaluating Momentive's material and UV extrusion process.Reduced footprint of production equipment. The silicone raw material is pumped via screw motion through the tooling producing the desired shape.
The tubing, still uncured at this stage, is then pulled through a heating tunnel, typically referred to as an HAV, or hot air vulcanizer, that can be up to 20 feet in length.

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