1.3.2.2 Silicates
These mortars are mostn otable for theirr esistance to concentrated acids,
excepth ydrofluoric acid and similar fluorinated chemicals, at elevated
temperatures. They are also resistant to many aliphatica nd aromatic
solvents. They are not intendedf or use in alkaline or alternately acid and
alkaline environments. Thiscategory of mortars includes
1. Sodium silicate
2. Potassium silicate
3. Silica (silica sol)
The majorapplications for thesemortars have been in the construction of
sulfuric acid plants and the brick lining of stacks subjectedt ov arying
concentrationsofsulfur and nitrogen oxides at elevated temperatures. Their
upper thermal capabilitiesa pproach those of refractory mortars.
Thes odium andp otassiums ilicatem ortars area vailablea st wocomponent systems, filler,a nd binder, with the setting agent in the filler.
TABLE 1.8
Comparative Chemical Resistance: 100% Carbon vs. 100% SilicaFilled Sulfur Mortars
Medium,R T1 00% Carbon
100% Silica
Acetic acid, to 10%
RR
Aqua regia
NN
Cadmium salts
RR
Chromic acid, to 20%
RR
Gold cyanide
RR
Hydrochloric acid
RR
Hydrofluoric acid
RN
Iron salts
RR
Magnesiums alts
RR
Methyl ethyl ketone
NN
Mineral spirits
NN
Nickel salts
RR
Nitric acid, to 40%
RR
Nitric/hydrofluoric acid
RR
Phosphoric acid
RR
Silver nitrate
RR
Sodium hydroxide
NN
Sodium salts
RR
Sulfuric acid, 80%
RR
Toluene
NN
Trichloroethylene
NN
Zinc, salts
RR
RT,room temperature; R, recommended; N, not recommended.
Chemical Resistant Mortars, Grouts, and Monolithic Surfacings
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