Silflex (Lead Alternative)

Get a Quote

    Silflex is Marshield’s lead alternative, highly customizable shielding silicone based product designed for radiation hot spots focused on ALARA principles

    MarShield introduces a new radiation shielding product, Silflex – a product made up of flexible, tungsten-impregnated, silicone pieces. This versatile form or shielding comes in a variety of shapes for use in many hard-to-shield applications. It is non-toxic, easy to work with and cut, and the lightest shielding available at 4.5 lbs per square foot. It is ideal for shielding small pipes, such as those smaller than 1″ in diameter. This non-hazardous product offers effective radiation protection wherever it is needed. It is highly resilient to boric acid and sodium hydroxide, and can be used in temperatures ranging from -50º to 250ºC

    Benefits of Silflex

    • .5” of Silflex is equal to a HVL (50% reduction in dose rate)
    • 1.2” to 2”  Silflex is equal to a TVL (90% reduction in dose rate)
    • Approximately 4.5 lbs./sq. ft. of Silflex is equal to 10 lbs./sq.  ft.  of lead wool.
    • Temperature from -50°C to +250°C.
    • Resistant to Boric Acid and Sodium Hydroxide.
    • Silflex requires no resealing and can be easily trimmed

    Available Products and Sizes


    Silflex sheets are a great alternative to lead blankets. They provide the same attenuation as a lead blanket with half the weight, and unlike lead they do not lose effectiveness over time. They are easy to clean, and eliminate the possibility of any “mixed waste” costs. Sheets are available in various sizes and thicknesses.

    Get a Quote


    This is the most versatile piece of shielding that we offer. It is easy and convenient to apply making it the perfect tool for taking care of emergency “hot spot” situations. Silflex tape can be wrapped around pipes, elbows, valves, etc. At 1/8” thick this product is less than 0.7 lbs. per linear ft. and is equivalent to a 10 lb. lead wool blanket. Standard tape widths are 1.75” and 3.75”. They are available in 1/8“ to 1/2” thicknesess, and the standard length is 15’ (other sizes are available upon request).


    Get a Quote

    Pipe Wraps

    Shielding a pipe doesn’t have to be a hassle anymore. Silflex pipe wraps are a convenient and quick solution for shielding pipes, elbows, tees and valves. This product is custom-made to fit the specified diameter, width, thickness and height of the pipe being shielded. Silflex pipe wraps can be engineered to meet weight and size restrictions. Silflex pipe Wraps are a great solution for shielding pipes that are small or in hard to reach areas.

    Get a Quote


    This is a great product for shielding solid or grated platforms. Not only does flooring provide a quick installation of excellent shielding, it provides workers with a cushioned work surface for kneeling. Standard flooring thickness is 1.25”, which provides approximately a HVL. Flooring manufactured using Silflex weighs approximately 18 lbs./sq. ft. It has a textured surface and is available with or without yellow coloring. Other thicknesses and materials are available upon request.


    Get a Quote


    Marshield is now producing SINGLE AND DOUBLE SIDED PREMIUM MAGNETIC SHIELDING systems for large-diameter pipes, reactor walls and anything made from carbon steel, that attach in seconds or minutes. The best part is no secondary attachment is required in most applications. In addition, this allows plant personnel to adapt this product according to dose-rate surveys. This allows extra shielding in seconds to areas that require attenuation.

    Silflex Shielding

    Get a Quote


    Silflex is perfect for custom applications. Pieces can be made to be flexible, or rigid and firm. If you have a complex shape that needs shielding, provide a picture or drawing and we can design or help you design the perfect shielding package.

    Silflex Custom Products

    Get a Quote


    Grommets: Make hanging or securing products easier during installation.
    Magnets:  New powdered premium magnetics available for FME (foreign material exclusion) purposes as well as a discrete magnet option
    Metal: Adds support to the shielding. Almost all products are available with metal components when needed.
    Permanent: Depending on application Silflex may be installed as a permanent shielding solution for up to 40+ years.

    Reactor Face Shielding

    With 1” thick shielding built to the design of the reactor face we have confirmed 30 to 40% dose reduction in the general area. Considering the number of man hours spent in front of the reactor face this has proven to be a very significant reduction. This shielding is custom built for each reactor face and is installed across several nuclear power plants in Canada and the USA.

    Neutron Shielding

    Composite shielding effective for gamma and neutron fields is now available for your Dry Fuel Storage campaigns. This high temperature shielding easily withstands the heat generated during forced helium drying which allows shielding to remain in place during the dewatered phase. A special blend of shielding material moderates and attenuates both fast and intermediate neutrons while the outer tungsten layer eliminates primary and secondary gammas. The lightweight design allows access to the weld locations without disturbing the majority of the shield package. 80-95% reductions in exposure rates have been achieved in field applications.


    Gamma rays – Very penetrating and are best stopped or shielded by dense materials, such as lead or uranium. Gamma rays are similar to x-rays.
    HVL (Half Value Layer) – the amount of shielding material to achieve 50% reduction in dose rate
    TVL (Tenth Value Layer) – the amount of shielding material to achieve 90% reduction in dose rate
    Radioactive Source – the radioactive element (e.g. Co-60)
    Attenuation – the reduction in dose rate. (Eg., HVL or TVL)

    Silflex Information Sheet
    Silflex Available Testing Reports
    Silflex Magnetics Information Sheet