What makes Supergel SUPER?

If you’re reading this blog in Europe – you’re probably already aware of Rosco’s Supergel range of color filters. Many lighting professionals in North America, however, aren’t aware of the brand – but thanks to myColor and our new website, they’ve been seeing the name more frequently and have been calling with inquiries about this “new range of super Rosco gels.” Supergel isn’t new at all. In fact, it’s been our most popular filter range in Europe for decades! Below we examine what makes these gels so “Super” and how, if you’re in North America, you’re probably already using them in your work.

What Is Supergel?

There are, essentially, three processes for manufacturing plastic color filters: 1.) Surface Coated, 2.) Deep Dyed and 3.) Body-Colored Extrusion. While each process has its own set of advantages and disadvantages, the third process, Body-Colored Extrusion, offers some distinct benefits that the other two cannot – and Rosco Supergel is the only lighting filter manufactured this way.

The process begins with clear polycarbonate resin pellets that are melted down. Under intense pressure and heat approaching 600°F (315°C), the molten resin is combined with the appropriate dye and then extruded into a 3 mil (.08 mm) thick, 24 inch (60 cm) film that is cut into the Supergel sheets and rolls used on theatrical stages all around the world.

The Advantages of Supergel

The body-colored polycarbonate process we use to manufacture Supergel offers three advantages over other color filters: color stability, heat resistance, and flame retardancy.

Because Supergel is body-colored, the dye is actually a part of the plastic. This means that the hue of the filter will remain constant as it fades. When it comes to surface-coated filters, the colorant is not a part of the plastic, which allows the dyes to migrate away from the heat. This process can cause the color to shift as it fades. Some blues, for example, have a tendency to shift toward green as they fade. Supergel’s body-colored process prohibits that from happening.

Supergel (L) vs. a surface-coated filter (R) – note the green color shift in the filter on the right

Rosco’s extruded polycarbonate offers two advantages over polyester films. First of all, Rosco Supergel filters are the only inherently flame retardant color filter in the world!

Recognizing the global importance of safety and fire prevention, Rosco includes a fire retardant additive in our polycarbonate resin formulation to create self-extinguishing filters. Supergel has been tested according to the strictest standards in the US and Europe, and is the only filter range to have earned the demanding German B1 flame-rating. It has also obtained the French M1 and the Italian CI flame-ratings, as well as NFPA classifications.

Polycarbonate also has a higher softening point than polyester – meaning that it will maintain its shape and tensile strength in hot fixtures better. Polyester films are also stretched into their final shape and thickness. This orientation imprints a tension memory onto a polyester color filter that causes it to pucker and distort when placed on hot lights. In contrast, Supergel is extruded into its final state without any stretching – enabling the color filter to maintain its shape without puckering in high temperatures. Both of these features are particularly advantageous when using color-scrollers, where puckering and softening/drooping of the filters can cause a scroll to rattle and bind-up.

Where To Find Supergel

As mentioned at the beginning of this article, most of our European customers are already familiar with the Rosco Supergel brand and know they can purchase Supergel from any Rosco dealer. Customers in North America will be happy to know that our Supergel filters are already inside the Roscolux swatch books they’ve got right now. Roscolux is a mixture of deep-dyed polyester filters and the extruded polycarbonate Supergel filters. To see the complete list of available colors – visit the Supergel page on our website, or you can also sort through the Supergel filters in our myColor web app.


Joel Svendsen

About Joel Svendsen

Content Marketing Manager: Joel's Rosco career began in Rosco's Hollywood office in 1999 – first in sales covering the Western US and the Los Angeles Film & Television market, and then as Product Manager for Rosco's Film & Television Products. Joel's knowledge about Rosco's products and how they're used in each of our different marketplaces makes him well suited for bringing the stories in Spectrum to life.

2 thoughts on “What makes Supergel SUPER?

  1. Is the Rosco 102302992124 heat resistant? If so, to how many degrees Celcius or Fahrenheit?

    Is it safe to wrap these directly around a 14 watt fluorescent bulb?

  2. Avatar Joel Svendsen

    Hello Nicholas –

    The maximum temperatures of Supergel are as-follows:
    Softening: 320°F (160°C)
    Melting: 425°F (220°C)

    Is your fluorescent bulb a tube? If so, we make sleeves that slip directly over the bulb (T5, T8 and T12 tubes).
    You can specify any Rosco filter you’d like, including the Supergel filters, to be inserted into these sleeves.

    Most fluorescent bulbs don’t get hot enough to affect the performance of the filter. Two things to be aware of, however:

    #1: The metal cathodes on the bulbs, particularly high-output bulbs (aka HO bulbs), can get hot enough to melt some of our filters.
    #2: Many fluorescent bulbs have a high concentration of UV (particularly T5 and T8 bulbs). This UV-concentration is not high enough to melt the filter, but it can be high enough to cause premature fading of the color filter. We recommend using a Rosco UV filter (Part #: 3114) in-between the bulb and the color filter to keep the UV from fading the color.
    This is standard practice for us in our RoscoSleeve business. Every T5 and T8 RoscoSleeve ships with the UV Filter in place.

    I hope that answers your questions.

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