Protect Your LED Investment with Premium Sealing
Energy-efficient, durable and long-lasting: these are just a few of the advantages of light-emitting diode (LED) lighting technology, which is increasingly being used in a wide range of applications. As global demand for energy-efficient systems grows alongside trends such as urban modernisation and the development of smart city infrastructures, LEDs are being introduced into outdoor areas including building exteriors, motorways and public spaces.
Whether they are powering digital signage and electronic displays or lighting large spaces such as car parks and recreation areas, LEDs are proving to be a low-maintenance solution that can provide years of service life. These benefits make them particularly valuable in remote or hard-to-reach locations. LEDs may also be chosen over other types of light sources for qualities such as flame retardancy and low outgassing — and their colour-rendering abilities and programmability make them an ideal fit for creating dazzling visuals from the Las Vegas Strip to the world’s tallest performing fountain in Dubai.
While the cost of LED installation can be somewhat higher than traditional lighting, it is likely to be outweighed by the resulting energy savings and reduced replacement costs. Yet this equation changes if the investment is not protected. In outdoor LED installations, one aspect of this is ensuring resilience against changing environmental conditions. In many parts of the world, this includes repeated exposure to harsh winter cycles over the bulbs’ long years of service. The importance of protection from the elements extends to warmer climates as well, given the world’s increasing environmental volatility.
The Role of Gaskets
In outdoor applications, the LEDs responsible for turning electricity into light are often encased in bulbs made of glass and set in an outer case made of metal. Between the bulbs and the case, gaskets are employed to provide both cushioning and protection.
Gaskets designed as a buffer for common environmental stressors including rain, snow, dust and sunlight are available in a range of materials: PVC plastic, EPDM and neoprene rubber, among others.
With greater environmental volatility, however, come greater challenges.
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Engineers specifying gasket materials must consider environmental trends such as increased exposure to ultraviolet (UV) rays, extreme heat and wildfires, as well as the intensity of windstorms, rainstorms and snowstorms. These factors can lead to faster deterioration and a shorter shelf life for gaskets — and, consequently, the need for more frequent replacement of the LEDs they are designed to protect. |
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Although lower-cost gasketing materials may reduce upfront expenses, this could come at the cost of increased maintenance requirements in the future. |
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LEDs used in outdoor applications often play a role in ensuring safety — streetlights, car parks, and building entrances and exits are prime examples. In these cases, selecting gasketing materials that cannot withstand extreme environmental conditions can lead to lighting failures, creating hazardous situations. The risks for end users include a higher likelihood of accidents such as slips and falls or vehicle collisions — while the responsibility for those risks rests squarely on the shoulders of the engineers specifying protective materials. |
Silicone protection: a more forward-thinking approach
A more forward-thinking approach towards protecting an investment in LEDs is incorporating the cost of premium gasketing materials into material specifications. Silicone offers durability that complements the years-long expected service life of LEDs, derived from several inherent properties including high tensile strength and excellent thermal stability. Compared to other elastomers, silicone’s low compression set also provides a greater ability to protect and cushion in gasket applications.
Our high-quality Norseal® silicone materials, available in a variety of foam rubber, sponge rubber and Strip-N-Stick (SNS) tape products, take a forward-thinking approach. Both foams and sponges are rated with a minimum 10-year shelf life. Specific products are tested for gasket use with specifications including UL-50 and UL-50E (recognised weather seal gasket), UL V-0 and JMLU2 (gasket materials). Due to our proprietary post-curing process, products impart a low outgassing quality. This minimises the tendency of gasketing materials to produce less condensation, a benefit for aesthetics as well as safety: less condensation means better brightness and clarity for fixtures designed to illuminate dimly lit areas.
Yet the true value of silicone gasketing becomes most evident in the context of environmental volatility. Qualities such as the ability to withstand extreme temperatures, resistance to fungus growth and long-term protection against dirt, moisture, sunlight, ozone and UV rays are examples of characteristics that translate to resilience in the face of a changing world.
Meeting User Needs
Each of the products in the Norseal silicone line is designed with specific end user requirements in mind. Foams can be deployed as lightweight gaskets, and they are non-corrosive when used with metals and in unpredictable environments. Sponges are a sound choice for “always-on” applications, such as petrol station lighting due to their thermal stability. Sponges also provide low water absorption, which is important for high-humidity applications. Tapes provide the flexibility to conform to irregular surfaces and shapes, and they can reduce overall lighting structure costs when used in place of expensive die-cut parts.
All form factors in the Norseal line — foams, sponges and tapes — also include products specifically designed for low toxicity and flame retardancy, factors especially important in public spaces and mass transit applications. Below are some selected specifications:
Silicone foam rubber
- Norseal F-12 and F-20: Soft, lightweight silicone foams with low density (F-12) and medium density (F-20). Outstanding compression set resistance and excellent flame resistance (UL94 V-0) with low toxicity and smoke generation.
Silicone sponge rubber
- Norseal R10480 and 10480S: Superior mechanical strength with thermal stability, extremely low compression set, very low outgassing and ozone/UV resistance. Prevents water penetration to LED electrical components. Recognised to UL-50E.
SNS foam tapes
- Norseal SNS100S and 200A: Provides benefits of silicone rubber in easy-to-apply, pressure-sensitive adhesive tape form with closed-cell sponge backing. SNS100S supplies wide temperature range silicone adhesive on one side; 200A supplies aggressive acrylic adhesive.
- Norseal 512GF and 520GF: Provides benefits of silicone in easy-to-apply, pressure-sensitive adhesive tape form with flame-retardant silicone foam backing (UL94 V-0 for base foam). 512GF uses F-12 foam with film-supported acrylic adhesive; 520GF uses F-20 foam with film-supported acrylic adhesive.
- Our thermally conductive product line such as our ThermaCool® Coated Fabrics TF1860 and 1870 Series are also an option to be used in commercial outdoor lighting to dissipate heat away from hot components, generated by LED lighting.
We are also willing to develop products to meet specific functional and aesthetic needs. Such custom solutions are designed to factor in anticipated environmental conditions and expected wear over the life expectancy of the product.
Protect investments of today to build future resilience
Given the energy efficiency and long service life of LEDs, it’s no surprise that the role they play in lighting the world is on the rise. But it’s also important to keep in mind the fact that the world is changing, which makes the investment in LED technology more challenging. Unlike lower-cost elastomers, premium gasketing materials such as Norseal silicones meet or exceed specifications tuned to environmental volatility. Get in touch today to learn more about products that are not just for protecting today’s investment, but also for building resilience into the requirements of tomorrow.
