Use the table below to review Walchem material codes and chemical compatibility.
Walchem Material Codes
LE Code | Head/Fittings | Valve Ball | Valve Seat | Valve Seals |
PC | GFRPP | Ceramic | FKM | FKM |
PE | GFRPP | Ceramic | EPDM | EPDM |
VC | PVC | Ceramic | FKM | FKM |
VE | PVC | Ceramic | EPDM | EPDM |
VF | PVC | PTFE | EPDM | EPDM |
VM | PVC | Ceramic | FKM | FKM |
FC | PVDF | Ceramic | PCTFE | PTFE |
TC | PVDF | Ceramic | FKM | FKM |
HV | GFRPP | 316SS | PCTFE | FKM |
SH | 316SS | Hast C276 | 316SS | PTFE |
VS | PVC | HC/SS | 304SS | EPDM |
VH | PVC | Hast C276 | PVC | EPDM |
S6 | 316SS | HC/316SS | 316SS | - |
P6 | GFRPP | 316SS | PCTFE | - |
PA | GFRPP | Ceramic | PCTFE | Aflas |
TA | PVDF | Ceramic | PCTFE | Aflas |
Info:
Diaphragms: All models have PTFE bonded EPDM diaphragms
Gaskets: All models have PTFE gaskets
LE Code suffixes:
H High Pressure version (250 PSI)
H2 High Pressure version (290 PSI)
N No Manual Air Vent Valve version
A Includes ‘Y’ style Auto Degassing valve below the Manual Air Vent Valve
A-F Includes 1st generation Auto Air Vent Valve
M Includes Multi-Function valve
C High Compression model. Includes Auto Degassing valve
Walchem Chemical Compatibility
Common Chemical | Recommended LE Material | Alternate LE Material |
Acetic Acid | PE (<60%) | FC, PA, TA |
Alcohol, isopropyl | PE | VE |
Alcohol, methyl | PE | VE |
Alum (aluminum sulfate) | PC, PE | VC, VE |
Aluminum chloride | PC, PE | VC, VE |
Aluminum sulfate (alum) | PC, PE | VC, VE |
Amines | PA, PE | FC, SH |
Ammonia | PE | VE |
Ammonium Hydroxide | PE | VE |
Ammonium Phosphate | PC, VC | PE, VE |
Ammonium Sulfate | PC, VC | PE, VE |
Bromine water | TC, VC | TA, FC |
Calcium carbonate | PC, PE | VC, VE |
Calcium chloride | PC, PE | VC, VE |
Calcium hydroxide (lime) | PE, PC | VE, VC |
Calcium hypochlorite | VC | VE |
Caustic soda (Sodium Hydroxide) | PE (<50%) | VE, TA |
Chlorine bleach (Sodium Hypochlorite) | VC(A) | TC |
Chlorine Dioxide | VC, TC (<70°F/<1%) | TC, FC (>70°F/1-2%) |
Chromic acid | TC, TA | PC (<20%) |
Citric Acid | PC, VC | TC, VE |
Copper Sulfate | VC, PC | VE, PE |
Ethylene glycol | PE, PC | TC, SH |
Ferric sulfate | PC, PE | VC, TC |
Ferric chloride | PE, PC | VE, VC, TC |
Formaldehyde | PC, PE | VC, TC |
Glutaraldehyde | TA, FC | PA (<3%) |
Hydrochloric acid (Muriatic Acid) | TC, TA (35-50%), PC, VC (<35%) | TA, FC (>50%) |
Hydrogen peroxide (50%) | VCA-H | TC, TA |
Hydrofluosilicic Acid | VF | - |
Hydrofluoric Acid (HF) | - | VF (DILUTE) |
Isothiazolones | PA, TA | FC |
Lime (calcium hydroxide) | PE, PC | VE, VC |
Methanol | PE | VE |
Nitric acid | PC (<30%), TC (30-50%) | FC, SH (>50%) |
Peracetic Acid (>10%) | FC | TA |
Peracetic Acid | TC (<10%) | PC, PE (<3%) |
Phosphoric acid (50%) | PC | VC |
Potassium carbonate | PC, PE | VC, VE |
Potassium hydroxide | PE | VE, FC |
Potassium permanganate | PE, VE | PC, FC, TC |
Soda ash (sodium carbonate) | PC, PE | VC, VE |
Sodium bicarbonate | PC, PE | VC, VE |
Sodium bisulfite/bisulfate | PC, PE | VC, VE |
Sodium Bromide | PC | VC |
Sodium carbonate (Soda ash) | PC, PE | VC, VE |
Sodium fluoride | VF | - |
Sodium hexametaphosphate | PC, PE | VC, VE |
Sodium hydroxide (caustic soda) | VE | PE (<50%) |
Sodium hypochlorite (chlorine bleach) | VC(A) | TC |
Sodium nitrate | PC, PE | VC, VE |
Sodium silicate (dilute) | PC, PE | VC, VE |
Sodium Sulfite | PC, PE | VC, VE |
Sulfuric acid | TC, FC, TA | VC, PC (<50%) |
All other Chemicals: Walchem's complete guide can be found here
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