Glossary

Term Definition
Abrasive, grit Natural or artificial material (e.g. gravel,
cinders or sand) used to increase the adhesion of a slippery surface
Additives Organic or inorganic materials added to de-icing salt to reduce corrosion and/or improve the spreading characteristics of the salt
Anti-caking agent Component added to spreading material to prevent
coagulation
Barn Structure built to cover the stored de-icing
salt to protect from the effects of the weather
Bin Receptacle for the storage of small quantities
of spreading material, on steep inclines
Brine Aqueous chloride solution, usually sodium, but
can be calcium, magnesium or potassium
Brine production facility System for the production of water based de-icing
solutions
BS 3247 The British Standard for De-icing Salt
De-icing, anti-icing agent Granular material or solution used to lower the
freezing point in order to remove ice or prevent it from forming
Depression of freezing point temperature The lowering of the freezing point of a liquid
by the addition of a solute. This is a fixed property of a given combination
of liquid and solid and is the mode of action of de-icing agents
Eutectic point Temperature below which salt will not melt ice
(-21oC)
Grit Natural mineral spreading medium consisting of
particles of stone
Gritter Vehicle with conveyor or auger conveyor for spreading
salt onto the road surface
Gritting/ Spreading agent Agent used to increase adhesion between tyres and the
road surface, so preventing skidding
Marine salt, sea salt Sodium chloride from solar evaporation of sea
water. It contains associated impurities such as Calcium Sulphate
and Magnesium Chloride
Mechanical shovel bucket loader Wheeled loader for loading a spreader with spreading
material
Open stockpile Open storage on a thick base for groundwater
protection
Precautionary treatment Treating road surfaces with salt, prior to an
expected snow or ice event
Pre-wetted salt Salt which is wetted prior to spreading, usually
using sodium chloride or calcium chloride brine solution. This improves
adherence to the road, and may encourage rapid thawing action, especially
in dry air conditions
Residual salt Salt on the road surface
Rock salt, halite Sodium chloride mined from natural salt beds.
May contain impurities such as Calcium Sulphate and Silicates
Salt saturator Specially designed vessel for continuous production
of saturated sodium chloride brine
Sand Natural mineral spreading medium (also “crushed”
sand).
Silo Raised storage vessel which allows direct filling
of spreading vehicles
Spreading material Material spread in order to counter slippery
conditions (Sand, salt, grit, granulates, brine)
Tank storage Reservoir for the storage of liquid de-icers
Thaw time The time taken for the ice or snow to melt after
treatment
Thawing component Portion of spreading medium responsible for thawing
Vacuum salt Pure sodium chloride prepared by the evaporation
of brine under vacuum conditions. The brine is usually extracted by
controlled solution mining of rock salt beds, but may be naturally
occurring
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