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Rock Salt

saltboat

ROCK SALT has a, “dry” density of approx. 1.28 tonnes/cu.metre, and a “wet” density of approximately 1.44 tonnes per cubic metre.  These figures are only a guide, because the density will depend upon the source of the salt, the grading and the moisture content.

It is an extremely quick and easy test to find the actual moisture content and density of the the salt you have delivered or have in stockpiles if you require more accurate figures, you really should be performing this testing on a regular basis.

SALT HAS VERY LITTLE EFFECT IN MELTING SNOW AND ICE BELOW THE TEMPERATURE OF MINUS 9 DEGREES CENTIGRADE

You will get an improvement in grip for vehicle wheels when using rock salt below minus 9 degrees centigrade from the physical action of the gritty nature of the salt improving friction, but not until the temperature rises above minus 9 degrees centigrade (or there abouts) will the ice/snow will start to melt.

RATES OF SPREAD OF ROAD SALT

The following rates are a GUIDE to salting, the actual rate will depend upon the road conditions, residual salinity, and severity of predicted weather conditions.

This table of SUGGESTED rates of spread is for impervious road surfaces, using rock salt specified to BS 3247.
Frost or ice after dry conditions………………………..10 – 15 grammes/sq. metre
Frost or ice after rainfall/wet conditions………………. 20 – 40
Snowfall…………………………………………….. 20 – 40

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