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 40°00
Acetone
CH3COCH3		 all concentrations20°00
Acetyl chloride
Ch3CoCl		 -boiling10
Aluminium
Al		 molten 750° 33
Aluminium Chloride L
Al Cl3,6H2O		 5%50°21
Formic Acid
H•COOH		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		 20°00
Malic acid
(COOH)2CH2CH OH		up to 50%20°00
Cider-20°00
Ethyl alcohol (ethanol)
C2H5OH		all concentrations20°00
Ethyl ether
(C2H5)2•O		-boiling00
Atmosphere--00
Petrolall concentrations20°00
Benzoic acid
C6H5CO O OH		all concentrations20°00
Beer-20°00
Blood--00
Spirits-20°00
Bromine Br L-20°
boiling		3
3		3
3
Buttermilk-20°00
Butyric acid
C3H7COOh		100%20°00
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 free20°00
Chlorine water L
=cold water saturated with water		-20°11
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-20°00
Iron phosphate solution, bonder process-98°00
Mineral oil-20°00
Vinegar = spirit vinegar-20°00
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 technical150°00
Oleic acid + traces
H2SO4		-hot21
Meat--00
Hydrofluoric acid = hydrogen fluoride
H2 F2		40%20°33
Fruit juices and fruit acids-20°00
Vegetables-boiling00
Tannic acid = tannin5%20°00
Glycerin
C3 H5 (OH)3		conc.20°
boiling		0
0		0
0
Pit wateracid20°00
Urine L-20°00
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%20°00
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%20°00
Caustic potash
KOH		50%20°00
Potassium permanganate
K Mn O4		all concentrations20°
boiling		0
0		0
0
Calcium chloride L
CaCL2, 6H2O		cold saturated20°00
Calcium hydroxide
Ca(OH)2 = milk of lime		-20°00
Cheese-20%00
Carbon dioxide = carbonic acid CO2dry
moist		hot
hot		0
0		0
0
Carbon tetrachloride C CL4water free20°00
Aqua regia L
H CL + HNO3		-20°33
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		concentrated20°00
Methyl alcohol
CH3OH		all concentrations20°00
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%20°11
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 saturated20°00
Novacaine-20°00
Fruit pulp containing SO2--00
Oil (lubricating oil)-20°00
Oil (vegetable)-20°00
P3 washing agent-95°00
Persil-20° and boiling00
Petroleum-20°00
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, dryfused130°00
Carbon disulphide
C S2		-20°00
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		<420°00
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		-20°00
Sea Water L-20°00
Soap-20°00
Mustard L-20°00
Spinning bathup to 10%
H2SO4		70°21
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