Type 1P VC resists attackb ym ost acids and strong alkalies, gasoline,
kerosene, aliphatic alcohols, and hydrocarbons. It is particularly useful in
the handlingo fh ydrochloric acid. The chemical resistance of type2PVC
(plastisol) to oxidizing and highly alkaline chemicals is reduced. Plastisol
canb ea ttackedb ya romatics,c hlorinated organicc ompounds,a nd
lacquer solvents.
In addition to handling highly corrosive anda brasive chemicals, many
applications have also been found in marinee nvironments. Table 4.15 lists
the compatibility of plastisolsw ith selected corrodents and Reference [1]
provides additional listings.
Vinyl plastisols are popular for use as an acid-resisting coating. Plastisol
has amaximum operating temperature of 1408 F( 608 C).
4.10.13 Perfluoroalkoxy
Perfluoroalkoxy (PFA) is manufactured by DuPont. It is not degraded by
systemsc ommonly encountered in chemical processes. It is inert to strong
minerala cids, inorganic bases, inorganic oxidizing agents, salt solutions,
and sucho rganic compounds as organic acids, aldehydes, anhydrides,
aliphatic hydrocarbons, alcohols, esters,e thers, chlorocarbons, fluorocarbons, and mixtures of the above. Refer to Table 4.16 for the compatibility
of PFAw ith selected corrodents and Reference [1] for additional listings.
PFAw illb ea ttacked by certain halogen complexes containing fluorine.
These include chlorinetrifluoride, bromine trifluoride, iodine pentafluoride,
and fluorineitself. It is also attacked by suchmetals as sodium or potassium,
particularly in their molten states.
Standard lining thickness is nominally 0.040 in.o ni nteriora nd wetted
surfaces. When abrasion is ap roblem, at hickness of 0.090 in. is available.
Coatings applied on carbon steel or stainless steel have acontinuous service
temperature of between K 608 F( K 518 C) and 4008 F( 2048 C).
Aprimer is required prior to applying the coating. If damaged, the coating
cannotber epaired. Heat is requiredt oc ure the coating.
Applications areu sed to provide corrosionp rotection, nonsticks urfaces,
and purity protection of chemicals beingh andled.
4.10.14 Fluorinated Ethylene Propylene
Fluorinated Ethylene Propylene (FEP)isafluorinated thermoplast but is less
expensive than PTFE (Teflon). With few exceptions,F EP exhibits the same
corrosion resistance as PTFE but at al ower temperature. It is resistant to
practically all chemicals, the exception being extremely potent oxidizers
such as chlorinetrifluoride, andrelated compounds. Some chemicals in high
concentrationswill attackFEP when at or near the service temperature limit.
Refer to Table4.17 for the compatibility of FEP with selected corrodents and
Reference [1] for additional listings.
Liquid-Applied Linings
121
CAT8247—CHAPTER 4—17/10/2006—14:34—SRIDHAR—XML MODEL B–pp. 69–174
kerosene, aliphatic alcohols, and hydrocarbons. It is particularly useful in
the handlingo fh ydrochloric acid. The chemical resistance of type2PVC
(plastisol) to oxidizing and highly alkaline chemicals is reduced. Plastisol
canb ea ttackedb ya romatics,c hlorinated organicc ompounds,a nd
lacquer solvents.
In addition to handling highly corrosive anda brasive chemicals, many
applications have also been found in marinee nvironments. Table 4.15 lists
the compatibility of plastisolsw ith selected corrodents and Reference [1]
provides additional listings.
Vinyl plastisols are popular for use as an acid-resisting coating. Plastisol
has amaximum operating temperature of 1408 F( 608 C).
4.10.13 Perfluoroalkoxy
Perfluoroalkoxy (PFA) is manufactured by DuPont. It is not degraded by
systemsc ommonly encountered in chemical processes. It is inert to strong
minerala cids, inorganic bases, inorganic oxidizing agents, salt solutions,
and sucho rganic compounds as organic acids, aldehydes, anhydrides,
aliphatic hydrocarbons, alcohols, esters,e thers, chlorocarbons, fluorocarbons, and mixtures of the above. Refer to Table 4.16 for the compatibility
of PFAw ith selected corrodents and Reference [1] for additional listings.
PFAw illb ea ttacked by certain halogen complexes containing fluorine.
These include chlorinetrifluoride, bromine trifluoride, iodine pentafluoride,
and fluorineitself. It is also attacked by suchmetals as sodium or potassium,
particularly in their molten states.
Standard lining thickness is nominally 0.040 in.o ni nteriora nd wetted
surfaces. When abrasion is ap roblem, at hickness of 0.090 in. is available.
Coatings applied on carbon steel or stainless steel have acontinuous service
temperature of between K 608 F( K 518 C) and 4008 F( 2048 C).
Aprimer is required prior to applying the coating. If damaged, the coating
cannotber epaired. Heat is requiredt oc ure the coating.
Applications areu sed to provide corrosionp rotection, nonsticks urfaces,
and purity protection of chemicals beingh andled.
4.10.14 Fluorinated Ethylene Propylene
Fluorinated Ethylene Propylene (FEP)isafluorinated thermoplast but is less
expensive than PTFE (Teflon). With few exceptions,F EP exhibits the same
corrosion resistance as PTFE but at al ower temperature. It is resistant to
practically all chemicals, the exception being extremely potent oxidizers
such as chlorinetrifluoride, andrelated compounds. Some chemicals in high
concentrationswill attackFEP when at or near the service temperature limit.
Refer to Table4.17 for the compatibility of FEP with selected corrodents and
Reference [1] for additional listings.
Liquid-Applied Linings
121
CAT8247—CHAPTER 4—17/10/2006—14:34—SRIDHAR—XML MODEL B–pp. 69–174