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

All models have [ PTFE bonded EPDM ] diaphragms and [ 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%)


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