6.6.11 PolyvinylideneChloride (Saran)
Saran is the trademark of Dow Chemical for their proprietary polyvinylidene chloride( PVDC)r esin.I th as am aximum allowableo perating
temperature of 1758 F/818 C. It is used to line piping as wella sv essels.
PVDCh as found wide applicationi nt he platingi ndustry and for
handling deionized water,P harmaceuticals, food processing, and other
applications where stream purity protection is critical. The material complies
with FDA regulations for food processing and potable water and also with
regulations prescribed by the Meat Inspection Division of the Department of
Agriculture for transporting fluids used in meat production. In applications
sucha sp latings olutions, chlorines, and certain other chemicals, Sarani s
superior to polypropylene and finds many applications in the handling of
municipal water supplies and waste waters. Refer to Table 6.35 for the
compatibility of PVDCw ith selected corrodents. Reference [1]p rovides a
more comprehensive listing.
TABLE 6.34 Continued
Maximum Te mperature
Chemical
8 F
8 C
Sodium hydroxide, 10%
300
149
Sodium hydroxide, 50%
250
121
Sodium hydroxide, conc.
150
66
Sodium hypochlorite,20%
300
149
Sodium hypochlorite,conc.
300
149
Sodium sulfide, to 50%
300
149
Stannic chloride
300
149
Stannous chloride
300
149
Sulfuric acid, 10%
250
121
Sulfuric acid, 50%
250
121
Sulfuric acid, 70%
250
121
Sulfuric acid, 90%
150
66
Sulfuric acid, 98%
150
66
Sulfuric acid, 100%
80
27
Sulfuric acid, fuming
300
149
Sulfurous acid
250
121
Thionyl chloride
150
66
Toluene
150
66
Trichloroacetic acid
150
66
White liquor
250
121
Zinc chloride
300
149
The chemicals listed are in the pure state or in asaturated solution unless otherwise indicated.
Compatibility is shown to the maximuma llowable temperature for which data is available.
Incompatibility is shown by an X. Ab lank space indicates that the data is unavailable.
Source:F rom P. A. Schweitzer.2 004. Corrosion Resistance Ta bles,V ols. 1–4, 5th ed., New York:
Marcel Dekker.
Corrosion of Linings and Coatings
398
CAT8247—CHAPTER 6—6/10/2006—12:32—SRIDHAR—XML MODEL B–pp. 287–402
Saran is the trademark of Dow Chemical for their proprietary polyvinylidene chloride( PVDC)r esin.I th as am aximum allowableo perating
temperature of 1758 F/818 C. It is used to line piping as wella sv essels.
PVDCh as found wide applicationi nt he platingi ndustry and for
handling deionized water,P harmaceuticals, food processing, and other
applications where stream purity protection is critical. The material complies
with FDA regulations for food processing and potable water and also with
regulations prescribed by the Meat Inspection Division of the Department of
Agriculture for transporting fluids used in meat production. In applications
sucha sp latings olutions, chlorines, and certain other chemicals, Sarani s
superior to polypropylene and finds many applications in the handling of
municipal water supplies and waste waters. Refer to Table 6.35 for the
compatibility of PVDCw ith selected corrodents. Reference [1]p rovides a
more comprehensive listing.
TABLE 6.34 Continued
Maximum Te mperature
Chemical
8 F
8 C
Sodium hydroxide, 10%
300
149
Sodium hydroxide, 50%
250
121
Sodium hydroxide, conc.
150
66
Sodium hypochlorite,20%
300
149
Sodium hypochlorite,conc.
300
149
Sodium sulfide, to 50%
300
149
Stannic chloride
300
149
Stannous chloride
300
149
Sulfuric acid, 10%
250
121
Sulfuric acid, 50%
250
121
Sulfuric acid, 70%
250
121
Sulfuric acid, 90%
150
66
Sulfuric acid, 98%
150
66
Sulfuric acid, 100%
80
27
Sulfuric acid, fuming
300
149
Sulfurous acid
250
121
Thionyl chloride
150
66
Toluene
150
66
Trichloroacetic acid
150
66
White liquor
250
121
Zinc chloride
300
149
The chemicals listed are in the pure state or in asaturated solution unless otherwise indicated.
Compatibility is shown to the maximuma llowable temperature for which data is available.
Incompatibility is shown by an X. Ab lank space indicates that the data is unavailable.
Source:F rom P. A. Schweitzer.2 004. Corrosion Resistance Ta bles,V ols. 1–4, 5th ed., New York:
Marcel Dekker.
Corrosion of Linings and Coatings
398
CAT8247—CHAPTER 6—6/10/2006—12:32—SRIDHAR—XML MODEL B–pp. 287–402