and where electrical resistance is required. Carbon fillers are used where
resistance to high concentrations of hydrofluoric acid arer equired. They
are also used as adhesivea nd potting compoundsf or corrosive electrical
conductance applications. Phenolic mortars are similar to the furans in that
they are two-component, easy-to-use mortars, with the acid catalyst or
curing agent incorporated in the powder.Phenolic resins areseldomused to
formulate grouts or monolithic surfacings.
Phenolic resins have al imited shelf life and mustbes tored at 458 F( 7 8 C).
Phenolic resin mortars, like epoxies, can be allergenic to sensitive skin. This
can be minimizedo rp revented by exercising good personal hygiene and
usingprotective creams. Table 1.5 provides comparative chemical resistance
for phenolic mortars compared to furan mortars, carbonvs. silica-filled.
1.3.1.4 Polyesters
Chemical-resistantp olyester mortarw as developed and introduced in the
early1950s at the specific request of the pulp and paper industry.The request
was for am ortarw ithr esistance to an ew bleach process utilizing chlorine
dioxide. Polyester mortars ultimately became the premier mortar for use
where resistance to oxidizingmediums is required.
Unsaturatedp olyester resinsa re alsou sedf or formulatingt ilea nd
machinery grouts as well as monolithic surfacing. These applications are
formidable challenges for the formulator because of their propensity to
causeshrinkage.
Polyester mortars can be formulated to incorporatecarbon and silica fillers
depending on the end use intended.For applications requiring resistance to
TABLE 1.5
Comparative Chemical Resistance: Phenolic Mortars vs. Furan Mortars
Furan
Phenolic
Medium, RT
Carbon
Silica
Carbon
Silica
Amyl alcohol
RRR
R
Chromic acid, 10%
NNNN
Gasoline
RRR
R
Hydrofluoric acid, to 50%
RNRN
Hydrofluoric acid, 93%
NNRN
Methyl ethyl ketone
RRR
R
Nitric acid, 10%
NNNN
Sodium hydroxide, to 5%
RRNN
Sodium hydroxide, 30%
RNNN
Sodium hypochlorite, 5%
NNNN
Sulfuric acid, to 50%
RRR
R
Sulfuric acid, 93%
NNRR
Xylene
RRR
R
RT,room temperature; R, recommended; N, not recommended.
Corrosion of Linings and Coatings
10
CAT8247—CHAPTER 1—6/10/2006—11:58—SRIDHAR—XML MODEL B–pp. 1–42
resistance to high concentrations of hydrofluoric acid arer equired. They
are also used as adhesivea nd potting compoundsf or corrosive electrical
conductance applications. Phenolic mortars are similar to the furans in that
they are two-component, easy-to-use mortars, with the acid catalyst or
curing agent incorporated in the powder.Phenolic resins areseldomused to
formulate grouts or monolithic surfacings.
Phenolic resins have al imited shelf life and mustbes tored at 458 F( 7 8 C).
Phenolic resin mortars, like epoxies, can be allergenic to sensitive skin. This
can be minimizedo rp revented by exercising good personal hygiene and
usingprotective creams. Table 1.5 provides comparative chemical resistance
for phenolic mortars compared to furan mortars, carbonvs. silica-filled.
1.3.1.4 Polyesters
Chemical-resistantp olyester mortarw as developed and introduced in the
early1950s at the specific request of the pulp and paper industry.The request
was for am ortarw ithr esistance to an ew bleach process utilizing chlorine
dioxide. Polyester mortars ultimately became the premier mortar for use
where resistance to oxidizingmediums is required.
Unsaturatedp olyester resinsa re alsou sedf or formulatingt ilea nd
machinery grouts as well as monolithic surfacing. These applications are
formidable challenges for the formulator because of their propensity to
causeshrinkage.
Polyester mortars can be formulated to incorporatecarbon and silica fillers
depending on the end use intended.For applications requiring resistance to
TABLE 1.5
Comparative Chemical Resistance: Phenolic Mortars vs. Furan Mortars
Furan
Phenolic
Medium, RT
Carbon
Silica
Carbon
Silica
Amyl alcohol
RRR
R
Chromic acid, 10%
NNNN
Gasoline
RRR
R
Hydrofluoric acid, to 50%
RNRN
Hydrofluoric acid, 93%
NNRN
Methyl ethyl ketone
RRR
R
Nitric acid, 10%
NNNN
Sodium hydroxide, to 5%
RRNN
Sodium hydroxide, 30%
RNNN
Sodium hypochlorite, 5%
NNNN
Sulfuric acid, to 50%
RRR
R
Sulfuric acid, 93%
NNRR
Xylene
RRR
R
RT,room temperature; R, recommended; N, not recommended.
Corrosion of Linings and Coatings
10
CAT8247—CHAPTER 1—6/10/2006—11:58—SRIDHAR—XML MODEL B–pp. 1–42