Corrosive media in the presence of A2 and A4

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Corrosive media in the presence of A2 and A4

Tables 17 and 18 provide an overview of the resistance of A2 and A4 in the presence of various corrosive media. This provides an optimum means of comparison. Do however note that the values stated are simply rough indications.

Tab. 17: Overview of the chemical resistance of A2 and A4

Corrosive agent	Concentration	Temperature in °C	Level of resistance
Corrosive agent	Concentration	Temperature in °C	A 2	A 4
Acetone	all	all	A	A
Ethyl aether	-	all	A	A
Ethyl alcohol	all	20	A	A
Form ic acid	10%	20 boiling	A B	A A
Am m onia	all	20	A	A
Am m onia	all	boiling	A	A
Any k ind of b enz ine	-	all	A	A
Benz oic acid	all	all	A	A
Benz ol	-	all	A	A
Beer	-	all	A	A
Hydrocyanic acid	-	20	A	A
Blood	-	20	A	A
Binder solution	-	98	A	A
Chlorine:				A
dry gas	-	20	A	D
dam p gas	-	all	D
Chloroform	all	all	A	A
Chrom ic acid	10% pure	20	A	A
		boiling	C	B
	50% pure	20	B	B
		boiling	D	D
Developer (photogr.)	-	20	A	A
Acetic acid	10%	20	A	A
Acetic acid	10%	boiling	A	A
Fatty acid	technical	150 180 200-235	A B C	A A A
Fruit juices	-	all	A	A
Tannic acid	all	all	A	A
Glycerine	conc.	all	A	A
Industrial air	-	-	A	A
Potassium perm anganate	10%	all	A	A
Lim e m ilk	-	all	A	A
Carb on dioxide	-	-	A	A
Cupric acetate	-	all	A	A
Copper nitrate	-	-	A	A
Copper sulphate	all	all	A	A
Magnesium sulphate	approx. 26%	all	A	A
Sea water	-	20	A	A
Methyl alcohol	all	all	A	A
Lactic acid	1.5% 10%	all 20 boiling	A A C	A A A
Sodium carb onate	cold s aturated	all	A	A
Sodium hydroxide	20% 50%	20 boiling 120	A B C	A B C
Sodium nitrate	-	all	A	A
Sodium perchlorate	10%	all	A	A
Sodium sulphate	cold s aturated	all	A	A
Fruit	-	-	A	A
Oils (m ineral and vegetab le)	-	all	A	A
Oxalic acid	10% 50%	20 boiling boiling	B C D	A C C
Petroleum	-	all	A	A
Phenol	pure	boiling	B	A
Phosphoric acid	10%	boiling	A	A
	50%	20	A	A
		boiling	C	B
	80%	20	B	A
		boiling	D	C
	conc.	20	B	A
		boiling	D	D
Mercury	-	up to 50	A	A
Mercury nitrate	-	all	A	A
Salicylic acid	-	20	A	A
	up to 40%	all	A	A
	50%	20	A	A
1%	up to 70	B	A
		boiling	B	B
	2.5%	up to 70	B	A
		boiling	C	C
Sulphuric acid	5%	20	B	A
		> 70	B	B
	10%	20	C	B
		70	C	C
	60%	all	D	D
Sulphurous acid	watery solution	20	A	A
Sulphur dioxide	-	100-500	C	A
Sulphur dioxide	-	900	D	C
Tar	-	hot	A	A
Wine	-	20 and hot	A	A
Tartaric acid	up to 10% above 10% up to 50% 75%	20 boiling 20 boiling boiling	A B A C C	A A A C C
Lem on juice	-	20	A	A
	up to 10%	all	A	A

Таб. 18: Разделение степеней стойкости на группы

Level of resistance

Evaluation

Weight loss in g/m2h

totally resistant

< 0.1

virtually resistant

0.1 - 1.0

less resistant

1.0 - 10

not resistant

> 10