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Calcium Hypochlorite Chemical Resistance

Resistance ratings for 24 plastics, elastomers and metals at 20 °C and 50 °C. Listed at 2 concentrations, because the rating depends on it.

At a glance

Based on the row for saturated, 20 °C.

Rated A, very good resistance
PTFE, HDPE, PP, PVDF, LDPE, FEP, ECTFE/ETFE, Nylon (PA), Acetal (POM), Polysulfone, PMP, SAN (12)
Rated B, good resistance
PVC Rigid, EPDM, Viton (FPM), SS 316, Polystyrene (5)
Rated C, limited resistance
SS 304, Polycarbonate, PVC Flexible, PETG (4)
Rated D, not resistant
NBR, Aluminium (2)
No data in the source
Silicone
Rated lower at 50 °C than at 20 °C
PVDF (A → C), PVC Rigid (B → C), Viton (FPM) (B → C), Nylon (PA) (A → D), Polycarbonate (C → D), Polystyrene (B → C), PMP (A → B)
Rating changes with concentration (20 °C)
EPDM: A (aqueous), B (saturated); Nylon (PA): A (saturated), D (aqueous); Polycarbonate: A (aqueous), C (saturated); Polystyrene: A (aqueous), B (saturated)

Based on the row for saturated, 20 °C.

Rating profile by material family

Calcium Hypochlorite: Rating profile by material familyThermoplastics: 8 A, 2 B, 3 C. Fluoropolymers: 4 A. Elastomers: 2 B, 1 D, 1 no data. Metals: 1 B, 1 C, 1 D.Thermoplastics (13)Thermoplastics: 8 × A, very good resistance (HDPE, LDPE, PP, PMP, SAN, Acetal (POM), Nylon (PA), Polysulfone)A 8Thermoplastics: 2 × B, good resistance (PVC Rigid, Polystyrene)B 2Thermoplastics: 3 × C, limited resistance (PVC Flexible, Polycarbonate, PETG)C 3Fluoropolymers (4)Fluoropolymers: 4 × A, very good resistance (PTFE, FEP, PVDF, ECTFE/ETFE)A 4Elastomers (4)Elastomers: 2 × B, good resistance (EPDM, Viton (FPM))B 2Elastomers: 1 × D, not resistant (NBR)D 1Elastomers: 1 × no data (Silicone)– 1Metals (3)Metals: 1 × B, good resistance (SS 316)B 1Metals: 1 × C, limited resistance (SS 304)C 1Metals: 1 × D, not resistant (Aluminium)D 1
A very good resistanceB good resistanceC limited resistanceD not resistantno data
Number of materials in each family with each rating at 20 °C.

Effect of temperature, 20 °C to 50 °C

Calcium Hypochlorite: Effect of temperature, 20 °C to 50 °CPVC Rigid B → C; PMP A → B; Polystyrene B → C; Polycarbonate C → D; Nylon (PA) A → D; PVDF A → C; Viton (FPM) B → C.ABCDPVC Rigid: B at 20 °C, C at 50 °CPVC RigidPMP: A at 20 °C, B at 50 °CPMPPolystyrene: B at 20 °C, C at 50 °CPolystyrenePolycarbonate: C at 20 °C, D at 50 °CPolycarbonateNylon (PA): A at 20 °C, D at 50 °CNylon (PA)PVDF: A at 20 °C, C at 50 °CPVDFViton (FPM): B at 20 °C, C at 50 °CViton (FPM)
20 °C50 °C
Materials whose rating differs between 20 °C and 50 °C. Materials not shown keep their rating or have no 50 °C value.

Substance

CAS number
7778-54-3
Formula
Ca(OCl)2
Hazard symbols in the source
O (oxidising), C (corrosive) (pre-GHS European symbols; check the current safety data sheet)
Concentrations listed
aqueous; saturated
Name in the source (German)
Calciumhypochlorit

Rating by concentration

Calcium Hypochlorite: Rating by concentrationHDPE: aqueous –, saturated A. LDPE: aqueous –, saturated A. PP: aqueous A, saturated A. PVC Rigid: aqueous –, saturated B→C. PVC Flexible: aqueous –, saturated C. PMP: aqueous –, saturated A→B. Polystyrene: aqueous A→C, saturated B→C. SAN: aqueous –, saturated A. Polycarbonate: aqueous A, saturated C→D. PETG: aqueous C, saturated C. Acetal (POM): aqueous A, saturated A. Nylon (PA): aqueous D, saturated A→D. Polysulfone: aqueous –, saturated A. PTFE: aqueous A, saturated A. FEP: aqueous A, saturated A. PVDF: aqueous A, saturated A→C. ECTFE/ETFE: aqueous –, saturated A. EPDM: aqueous A, saturated B*. Viton (FPM): aqueous B→C, saturated B→C. NBR: aqueous D, saturated D. SS 316: aqueous B, saturated B. SS 304: aqueous C, saturated C. Aluminium: aqueous D, saturated D.aqueoussaturatedTHERMOPLASTICSHDPEHDPE, aqueous: no data–HDPE, saturated: A at 20 °C, A at 50 °CALDPELDPE, aqueous: no data–LDPE, saturated: A at 20 °C, A at 50 °CAPPPP, aqueous: A at 20 °C, A at 50 °CAPP, saturated: A at 20 °C, A at 50 °CAPVC RigidPVC Rigid, aqueous: no data–PVC Rigid, saturated: B at 20 °C, C at 50 °CB→CPVC FlexiblePVC Flexible, aqueous: no data–PVC Flexible, saturated: C at 20 °CCPMPPMP, aqueous: no data–PMP, saturated: A at 20 °C, B at 50 °CA→BPolystyrenePolystyrene, aqueous: A at 20 °C, C at 50 °CA→CPolystyrene, saturated: B at 20 °C, C at 50 °CB→CSANSAN, aqueous: no data–SAN, saturated: A at 20 °C, A at 50 °CAPolycarbonatePolycarbonate, aqueous: A at 20 °CAPolycarbonate, saturated: C at 20 °C, D at 50 °CC→DPETGPETG, aqueous: C at 20 °CCPETG, saturated: C at 20 °CCAcetal (POM)Acetal (POM), aqueous: A at 20 °CAAcetal (POM), saturated: A at 20 °CANylon (PA)Nylon (PA), aqueous: D at 20 °C, D at 50 °CDNylon (PA), saturated: A at 20 °C, D at 50 °CA→DPolysulfonePolysulfone, aqueous: no data–Polysulfone, saturated: A at 20 °C, A at 50 °CAFLUOROPOLYMERSPTFEPTFE, aqueous: A at 20 °C, A at 50 °CAPTFE, saturated: A at 20 °C, A at 50 °CAFEPFEP, aqueous: A at 20 °C, A at 50 °CAFEP, saturated: A at 20 °C, A at 50 °CAPVDFPVDF, aqueous: A at 20 °C, A at 50 °CAPVDF, saturated: A at 20 °C, C at 50 °CA→CECTFE/ETFEECTFE/ETFE, aqueous: no data–ECTFE/ETFE, saturated: A at 20 °C, A at 50 °CAELASTOMERSEPDMEPDM, aqueous: A at 20 °CAEPDM, saturated: B at 20 °C (estimate)B*Viton (FPM)Viton (FPM), aqueous: B at 20 °C, C at 50 °CB→CViton (FPM), saturated: B at 20 °C, C at 50 °CB→CNBRNBR, aqueous: D at 20 °C, D at 50 °CDNBR, saturated: D at 20 °C, D at 50 °CDMETALSSS 316SS 316, aqueous: B at 20 °CBSS 316, saturated: B at 20 °CBSS 304SS 304, aqueous: C at 20 °CCSS 304, saturated: C at 20 °CCAluminiumAluminium, aqueous: D at 20 °C, D at 50 °CDAluminium, saturated: D at 20 °C, D at 50 °CD
A very good resistanceB good resistanceC limited resistanceD not resistantno data
Each cell shows the rating at 20 °C. Where the rating at 50 °C differs, it follows the arrow. * marks an estimate in the source.
Show as a table
Materialaqueoussaturated
Thermoplastics
HDPE–A
LDPE–A
PPAA
PVC Rigid–B
PVC Flexible–C
PMP–A
PolystyreneAB
SAN–A
PolycarbonateAC
PETGCC
Acetal (POM)AA
Nylon (PA)DA
Polysulfone–A
Fluoropolymers
PTFEAA
FEPAA
PVDFAA
ECTFE/ETFE–A
Elastomers
EPDMAB*
Viton (FPM)BB
NBRDD
Silicone––
Metals
SS 316BB
SS 304CC
AluminiumDD

* estimated rating, given in the source without a temperature

Resistance table: Calcium Hypochlorite, aqueous

Remark: Bleichpulver

Material20 °C50 °CRemark
Thermoplastics
PPAA
PolystyreneAC
PolycarbonateA–
PETGC–
Acetal (POM)A–
Nylon (PA)DD
Fluoropolymers
PTFEAA
FEPAA
PVDFAA
Elastomers
EPDMA–
Viton (FPM)BC
NBRDD
Metals
SS 316B–
SS 304C–
AluminiumDD

Not rated in the source, so not in the table: HDPE, LDPE, PVC Rigid, PVC Flexible, PMP, SAN, Polysulfone, ECTFE/ETFE, Silicone

Resistance table: Calcium Hypochlorite, saturated

Remark: Bleichpulver

Material20 °C50 °CRemark
Thermoplastics
HDPEAA
LDPEAA
PPAA
PVC RigidBC
PVC FlexibleC–
PMPAB
PolystyreneBC
SANAA
PolycarbonateCD
PETGC–
Acetal (POM)A–
Nylon (PA)AD
PolysulfoneAA
Fluoropolymers
PTFEAA
FEPAA
PVDFAC
ECTFE/ETFEAA
Elastomers
EPDMB*–
Viton (FPM)BC
NBRDD
Metals
SS 316B–
SS 304C–
AluminiumDD

* estimated rating, given in the source without a temperature

Not rated in the source, so not in the table: Silicone

Rating scale

A rating marked * is an estimate in the source, not a test result. An estimate is given as one value without a temperature.

Frequently Asked Questions

Which materials resist Calcium Hypochlorite at high concentrations?

The materials with an A rating (resistant) for Calcium Hypochlorite at 20 °C are: PTFE, HDPE, PP, PVDF, LDPE, FEP, ECTFE/ETFE, Nylon (PA). These can generally be used in direct contact.

Which materials should be avoided with Calcium Hypochlorite?

Materials rated D (not resistant) for Calcium Hypochlorite are: NBR, Aluminium. These should not be used in contact with Calcium Hypochlorite.

Does temperature affect chemical resistance to Calcium Hypochlorite?

Yes. 7 of 17 tested materials show a worse rating at 50 °C than at 20 °C for Calcium Hypochlorite. Materials affected include: PVDF, PVC Rigid, Viton (FPM), Nylon (PA), Polycarbonate, Polystyrene.

Is PTFE safe for Calcium Hypochlorite?

PTFE is rated A for Calcium Hypochlorite at 20 °C. A rating of A means resistant, B means limited resistance, C means partly resistant, and D means not resistant.

Does concentration affect chemical resistance to Calcium Hypochlorite?

Yes. Calcium Hypochlorite is tested at 2 concentrations (aqueous, saturated). Some materials change their rating depending on the concentration.

About this data

The ratings come from the chemical resistance list published by Bürkle GmbH, which compiled them from raw-material manufacturers’ data. They describe laboratory tests on the raw material at 20 °C and 50 °C.

A finished part also sees pressure, mechanical stress, welds and mixtures that a laboratory test does not. Treat the rating as a first filter and test under your own conditions before relying on it.

Chemicals with a similar resistance profile

Same 20 °C rating on the share of materials shown.

Sodium Acetate 65 %Sodium Cyanide 62 %Potassium Hypochlorite 62 %Sodium Bromide 61 %Hydrochloric Acid 61 %Silver Nitrate 61 %