The bisphenolFo re poxy Novolac ares imilar systemst ot he bisphenol
Ae poxy systems in that they use alkaline hardeners and the same fillers.
The major advantage for the use of the bisphenol Fi si mproved resistance to
1. Aliphatic and aromatic solvents
2. Higher concentrations of oxidizinga nd nonoxidizing acids
Disadvantages of these systems are that they involve
1. Less plastic with slightly more shrinkage
2. Slightly less resistance to alkaline mediums
The thermal resistance and physical properties are otherwise very similar
to the bisphenolAs ystems.
1.3.1.2 Furans
The polyfurfuryl alcoholo rf uran resins are the most versatileo fa ll the
resins used to formulate corrosion-resistant mortars and grouts. They are
used for monolithic surfacings; however,t hey are not ap opular choice
because of theirb rittleness and their propensity to shrink.T hey provide a
broad range of chemical resistance to most nonoxidizing organic and
inorganic acids, alkalies, salts, oils, greases, and solvents to temperatures
of 3608 F( 1828 C). Table 1.4 provides comparative chemical resistance
for furan resinm ortars andg routs with 100% carbon and part carbon/
silica fillers.
Of all the room temperature curing resins, furansa re one of the highest
in thermal resistance with excellent physical properties. Furan resins are
uniquei nt hat they are agriculturally,n ot petrochemically,b ased as are
most synthetic resins. Furfuryl alcoholi sp roduced from sucha gricultural
by-products as corn cob,bagasse, rice,and oat hull.
Thef uran resin mortarsa nd groutsa re convenient-to-use,t wocomponent systemsc onsisting of the resin and afi ller. The catalyst or
hardener system is an acid that is contained in the filler. The most popular
fillers are carbon, silica, and ac ombination of carbona nd silica. The 100%
carbon-filled furan resin mortars and grouts provide the broadest range of
chemical resistance because of the inherent chemical resistance of the resin
and the carbon filler to all concentrationso fa ll alkalies, as wella st o
hydrofluoric acid ando ther fluorinec hemicals. The advantages of mortars
with part carbona nd part silica fillers ares lightly improved workability,
physical properties, and cost. Grouts generally utilize 100% carbon filler
because of the superiorc hemical resistance and flow properties.
The acidic catalysts employedinfuran systems preclude their use directly
on concrete, steel, and other substrates that could react with the acid.
Chemical Resistant Mortars, Grouts, and Monolithic Surfacings
7
CAT8247—CHAPTER 1—6/10/2006—11:58—SRIDHAR—XML MODEL B–pp. 1–42
Ae poxy systems in that they use alkaline hardeners and the same fillers.
The major advantage for the use of the bisphenol Fi si mproved resistance to
1. Aliphatic and aromatic solvents
2. Higher concentrations of oxidizinga nd nonoxidizing acids
Disadvantages of these systems are that they involve
1. Less plastic with slightly more shrinkage
2. Slightly less resistance to alkaline mediums
The thermal resistance and physical properties are otherwise very similar
to the bisphenolAs ystems.
1.3.1.2 Furans
The polyfurfuryl alcoholo rf uran resins are the most versatileo fa ll the
resins used to formulate corrosion-resistant mortars and grouts. They are
used for monolithic surfacings; however,t hey are not ap opular choice
because of theirb rittleness and their propensity to shrink.T hey provide a
broad range of chemical resistance to most nonoxidizing organic and
inorganic acids, alkalies, salts, oils, greases, and solvents to temperatures
of 3608 F( 1828 C). Table 1.4 provides comparative chemical resistance
for furan resinm ortars andg routs with 100% carbon and part carbon/
silica fillers.
Of all the room temperature curing resins, furansa re one of the highest
in thermal resistance with excellent physical properties. Furan resins are
uniquei nt hat they are agriculturally,n ot petrochemically,b ased as are
most synthetic resins. Furfuryl alcoholi sp roduced from sucha gricultural
by-products as corn cob,bagasse, rice,and oat hull.
Thef uran resin mortarsa nd groutsa re convenient-to-use,t wocomponent systemsc onsisting of the resin and afi ller. The catalyst or
hardener system is an acid that is contained in the filler. The most popular
fillers are carbon, silica, and ac ombination of carbona nd silica. The 100%
carbon-filled furan resin mortars and grouts provide the broadest range of
chemical resistance because of the inherent chemical resistance of the resin
and the carbon filler to all concentrationso fa ll alkalies, as wella st o
hydrofluoric acid ando ther fluorinec hemicals. The advantages of mortars
with part carbona nd part silica fillers ares lightly improved workability,
physical properties, and cost. Grouts generally utilize 100% carbon filler
because of the superiorc hemical resistance and flow properties.
The acidic catalysts employedinfuran systems preclude their use directly
on concrete, steel, and other substrates that could react with the acid.
Chemical Resistant Mortars, Grouts, and Monolithic Surfacings
7
CAT8247—CHAPTER 1—6/10/2006—11:58—SRIDHAR—XML MODEL B–pp. 1–42