Color-Coded Modeling Media

We offer two different types of media:  Color-Coded-by-Size (see information below) and Non-Color-Coded.

Color-Coded Media

Our modeling media is made of recycled, ground melamine plastic (learn more on Wikipedia).  It has a density of 1.6, about 60% the density of quartz sand, which means it demonstrates river processes with impressive accuracy on compressed scales of space and time.  Its range of colors allows for easy view of sediment transport processes. The media is lightweight and easy to transport.  It won’t damage pumps, and it is much easier to clean than sand and other quartz materials. 1 cubic foot of media is 50 pounds (1 liter of media is 1.76 pounds).

Color-coded-by-size media comes standard with the Em4 and Emflume1 models.

Request a quote.

Please note that we will soon be transitioning to a new color-coded mix with some smaller particle sizes, so the sizes below are subject to change if you place an order. If you currently own the mix listed below and need to refill your current stock, we are maintaining a supply of it so that we can fill your order. Please call us with any questions. 


“Carbondale” Mix (this is our original color-coded mix in use since 2008)

Average particle sizes are:

  • Yellow: 1.4 mm
  • White: 1.0 mm
  • Brown: 0.7 mm
  • Red: 0.4 mm
Emriver color-coded media particle size distribution, graphic by Matt Kuchta

Emriver color-coded media particle size distribution; graphic by Matt Kuchta

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See color-coded media in this delta-building demonstration in an Em4 in the Little River lab: