Quote:
Originally Posted by Indian Charlie
Thanks.
Isn't sand made from silica?
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Sand can be made of many different materials, but what we know as sand in the US is normally predominantly Silica.
The reason Silica is used is that it is harder and doesn't break down into finer particles as easily. Finer particles pack down and compact and get hard easier.
Most tracks in the US (synthetic or "dirt") are made of a mixture of 75-85% sand along with clay, silt, loam, (and in the case of synthetics) other "stuff".
I believe the nylon he's talking about will be used as a screen to keep the top layer(s) of the track from getting into the bigger crushed stone and drains.
On paper this could work, but on paper synthetics do, too.