Chemical Resistance Table For Screws in A2 and A4

Classification of corrosion resistance:

  • 0 = resistant (but see L)
  • 1 = slight attack, usable in certain areas
  • 2 = hardly any resistance at all, practically unusable
  • 3 = no resistance
  • L = danger of pitting even in resistant class
Corrosive AgentConcentrationTemp CMaterial
A2A4
Effluent water (with traces of sulphuric acid) -up to 4000
Acetone
CH3COCH3
 all concentrations2000
Acetyl chloride
Ch3CoCl
 -boiling10
Aluminium
Al
 molten 750 33
Aluminium Chloride L
Al Cl3,6H2O
 5%5021
Formic Acid
HCOOH
10%
15%
100%
20
20
20
0
0
0
0
0
0
Ammonia
NH3
--00
Ammonium chloride (sal ammoniac)  L
NH4OH
10%
25%
50%
cold and hot saturated
boiling
boiling
boiling
20
boiling
0
1
2
0
2
0
1
1
0
1
Ammonium hydroxide
NH4OH
all20
boiling
00
Ammonium perchlorate L
NH4CIO4
10%20
boiling
0
0
0
0
Aniline
C6H7NH2
 2000
Malic acid
(COOH)2CH2CH OH
up to 50%2000
Cider-2000
Ethyl alcohol (ethanol)
C2H5OH
all concentrations2000
Ethyl ether
(C2H5)2O
-boiling00
Atmosphere--00
Petrolall concentrations2000
Benzoic acid
C6H5CO O OH
all concentrations2000
Beer-2000
Blood--00
Spirits-2000
Bromine Br L-20
boiling
3
3
3
3
Buttermilk-2000
Butyric acid
C3H7COOh
100%2000
Chlorine Cl
Gas
in dry state
Gas
in moist state L

-

-

20

20

100

0

3

3

0

3

3

Chloride of lime L
Ca (IO)2, CaO, 2 H2O
Bleaching solution
dry
moist
2.5g Cl/l
20
20
20
0
1
1
0
1
0
Chloroform
CH CL3
water free2000
Chlorine water L
=cold water saturated with water
-2011
Hydrogen chloride gas L
HCI
-
-
-
-
20
50
100
400
1
1
2
3
1
1
1
3
Chromic oxide
CrO3
10% pure
50% pure
20
20
0
1
0
1
Ferrogallic ink L-2000
Iron phosphate solution, bonder process-9800
Mineral oil-2000
Vinegar = spirit vinegar-2000
Acetic acid
CH3COOH
10%
50%
20
20
0
0
0
0
Glacial acetic acide boiling100%20
boiling
0
1
0
1
Acetic acid + hydrogen peroxide
CH3COOH + H2O2
10 u. 50%20
50
90
0
0
0
0
0
0
Dyer's bath alkaline or neutral organically acid slightly sulphuric acid or organically acid + sulphuric acid
(H2SO4 below 1%)
-

-

-

20
boiling
boiling

20
boiling

0
0
0

0
1

0
0
0

0

Oleic acid
C17H33COOH
30 bar technical15000
Oleic acid + traces
H2SO4
-hot21
Meat--00
Hydrofluoric acid = hydrogen fluoride
H2 F2
40%2033
Fruit juices and fruit acids-2000
Vegetables-boiling00
Tannic acid = tannin5%2000
Glycerin
C3 H5 (OH)3
conc.20
boiling
0
0
0
0
Pit wateracid2000
Urine L-2000
Iodine I Ldry
moist
20
20
0
1
0
0
Coffee-20
boiling
0
0
0
0
Potassium aluminium sulphate = alum
KAL(SO4)2, 12H2O)
10%2000
Potassium chloride L
K Cl
hot
saturated
20
boiling
0
0
0
0
Potassium ferricyanide = red prussiate of potash
K3(Fe[CN]6)
-000
Potassium ferrocyanide = yellow prussiate or potash
K4[Fe(CN)6], 3 H2O)
-20
boiling
0
0
0
0
Potassium hydroxide = caustic potash solution20%2000
Caustic potash
KOH
50%2000
Potassium permanganate
K Mn O4
all concentrations20
boiling
0
0
0
0
Calcium chloride L
CaCL2, 6H2O
cold saturated2000
Calcium hydroxide
Ca(OH)2 = milk of lime
-2000
Cheese-20%00
Carbon dioxide = carbonic acid CO2dry
moist
hot
hot
0
0
0
0
Carbon tetrachloride C CL4water free2000
Aqua regia L
H CL + HNO3
-2033
Cupric sulphate
CuSO4, 5H20
= copper vitriol
+3% H2SO4
all concs.20
boiling
20
boiling
0
0
0
0
0
0
0
0
Glue (including acid)-boiling00
Linseed oil
+3% H2SO4
-20
200
0
0
0
0
Magnesium sulphate
MgSO4, 7H2O
= Epsom salts
concentrated2000
Methyl alcohol
CH3OH
all concentrations2000
Milkfresh
sour
up to 70 c
up to 70 C
0
0
0
0
Lactic acid
CH3 CHOH COOH
1.5%
80%
20
20
0
0
0
0
Mixed acids
(nitrating acids)
50% H2SO4 +50% HNO3

75% H2SO4
+25% HNO3

20% H2SO4
+15% HNO3

70% H2SO4 + 10% HNO3

30% H2SO4
+5% HNO3

50

50

50

50

50

0

1

0

0

0

0

0

0

0

0

Monochloracetic acid L
CH2 Cl COO H
50%2011
Sodium
chloride L
NaCl = cooking salt
cold
saturated
hot
saturated
20

100
100
0

1
1
0

0
1
Sodium chloride L
Na Cl O2
Sodium hydroxide
=caustic soda solution
=caustic soda
NaOH
5%

25%

50%

20
boiling
20

boiling

2
3
0

2

2
2
0

2

Sodium hypochlorite L
NaClO
=bleaching solution
5%20

boiling

1

1

1

1

Sodium carbonate
Na2 CO3, 10 H2O
10%
cold saturated
boiling00
Sodium sulphate
Na2 SO4, 10 H2O
cold saturated2000
Novacaine-2000
Fruit pulp containing SO2--00
Oil (lubricating oil)-2000
Oil (vegetable)-2000
P3 washing agent-9500
Persil-20 and boiling00
Petroleum-2000
Phosphoric acid
H3PO4
chemically pure
1%
10%
45%
60%
20
20
20
20
0
0
0
0
0
0
0
0
Photographic developer (Agfa-glyzin developer)-20 00
Photographic fixing bath L-20 00
Pickling brine L-20 00
Nitric acid
HNO3
7%
10%
25%
37%
50%
20
20
20
20
20
0
0
0
0
0
0
0
0
0
0
Hydrochloric acid L
HCl
0.5%20
boiling
1
3
1
3
Sauerkraut brine L--21
Lard-20 00
Soft Soap-20 00
Sulphur, dryfused13000
Carbon disulphide
C S2
-2000
Sulphuric acid
H2SO4

 

 

 

 

 

fuming
(11% free SO3)
fuming
(60% free SO3)

1%

2.5%

5%

7.5%

10%
20%
80%

98%
=concentrated
-

-

20
boiling
20
boiling
20
boiling
20
boiling
20
20
20
70
20
70

20
100
20
80
1
1
1
2
1
3
1
2
2
1
1
3
0
2

0
1
0
0
0
1
0
2
0
2
0
2
1
1
1
2
0
2

0
0
0
0
Hydrogen sulphide dry
H2S
<42000
Sulphurous acid
H2 S O2
saturated
4 bar
5-8 bar
10-20 bar
20
135
160
180-200
0
1
2
2
0
0
1
1
Schweinfurt green
3 Cu (As O2)3,
Cu (CH3 COO)2
-2000
Sea Water L-2000
Soap-2000
Mustard L-2000
Spinning bathup to 10%
H2SO4
7021
Tar (pure)-20 and hot00
Turpentine-20 and hot00
Vaseline-20 and hot00
Water
Tap water
Pit water
= acidic water
-20
20
0
0
0
0
Water vapour
Water vapour with SO2
Water vapour with CO2
-

-

-
400

-

-
0

1

0
0

0

0
Wine
(white and red)
-20 and hot0
0
0
0
Tartaric acid
COOH (CHOH)2 COOH
10%
50%
20
20
0
0
0
0
Lemon juice
Citric acid
HO C(CH2 COOH)2,
COOH, H2)
-
1%
10%
25%
50%
20
20
20
20
20
0
0
0
0
0
0
0
0
0
0
Sugar solution-20
boiling
0
0
0
0

*All information is strictly informative