Chemical Analysis Tables

The tables below list the most common alloys that we manufacture. Note that we are able to cast to any recognised or special purpose alloy composition. Please contact us for further information.

ALUMINIUM
CHEMICAL COMPOSITION LIMITS (AS2239 - 2003)

Element	Chemical Composition, %
	Designation A1		Designation A2		Designation A5		Designation A6
	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
Zinc	2.1	2.7	3.0	5.0	4.0	5.0	2.0	6.0
Indium	0.017	0.025	0.02	0.05	-	-	0.01	0.02
Cadmium	0.008	0.012	-	0.005	-	0.005	-	0.005
Silicon	-	0.20	-	0.20	-	0.25	0.08	0.12
Iron	-	0.12	-	0.12	-	0.25	-	0.12
Magnesium	-	-	0.6	2.2	-	-	-	0.02
Titanium	-	-	0.02	0.05	-	-	-	0.02
Copper	-	0.006	-	0.006	-	-	-	0.006
Tin	-	-	-	-	0.05	0.25	-	0.02
Other Impurities
- Each	-	0.02	-	0.02	-	-	-	0.02
- Total	-	0.05	-	0.05	-	0.15	-	0.05
Aluminium	remainder		remainder		remainder		remainder

NOTES:
1. Alloys A1, A2 and A6 are commonly used in Australia for sea water applications.
2. Alloy A5 is used in portable water systems for temperatures up to 85oC.
3. Aluminium alloys activated against self passivation by toxic elements such as Indium, Thallium, Cadmium or Mercury are unacceptable for use in domestic water storage heater applications.

ALUMINIUM
CHEMICAL COMPOSITION LIMITS (GALVALUM - Oronzio de Nora)

Element
Chemical Composition, %
Galvalum III
Galvalum IV
Min.
Max.
Min.
Max.
Zinc
2.8
4.0
2.8
6.5
Indium
0.01
0.02
0.01
0.02
Cadmium
-
-
-
-
Silicon
0.11
0.21
0.08
0.21
Iron
-
0.10
-
0.12
Magnesium
-
-
-
-
Titanium
-
-
-
-
Copper
-
0.006
-
0.006
Tin
-
-
-
-
Other Impurities
- Each
-
0.02
-
0.02
- Total
-
0.05
-
0.05
Aluminium
remainder
remainder

MAGNESIUM
CHEMICAL COMPOSITION LIMITS (AS2239 - 2003)

Element
Chemical Composition, %
Cast or extruded high potential
Extruded low potential
Cast low potential
Designation M1
Designation M2
Designation M3
Min.
Max.
Min.
Max.
Min.
Max.
Aluminium
-
0.01
2.5
3.5
5.3
6.7
Zinc
-
0.02
0.7
1.3
2.5
3.5
Manganese
0.50
1.3*
0.20
1.5
0.25
0.40
Silicon
-
0.05
-
0.05
-
0.05
Copper
-
0.02
-
0.006
-
0.05
Iron
-
0.03
-
0.003
-
0.03
Nickel
-
0.001
-
0.001
-
0.003
Calcium
-
0.04
-
0.04
-
0.04
Other Impurities
- Each
-
0.05
-
-
-
-
- Total
-
0.30
-
0.30
-
0.30
Magnesium
remainder
remainder
remainder

* In the range 0.50 to 0.80%, the percentage of manganese is required to be at least 0.5 + (60 x % aluminium).
NOTES:
1. Alloy M1 is high potential anode material and is used in high resistivity soils and waters.
2. Alloys M2 and M3 are low potential anode materials and are used in medium resistivity soils and water. Alloy M2 is also used in hot-water applications for temperatures up to 80oC.
3. In order to minimise the self-corrosion of alloy M2 when used in domestic water storage heater applications, it has been found desirable to maintain the iron content below 0.003%, with 0.20 - 0.60% manganese.
4. Magnesium anodes are not suitable for long term protection in sea water.

ZINC
CHEMICAL COMPOSITION LIMITS (AS2239 - 2003)

Element	Chemical Composition, %
	Designation Z1*		Designation Z2
	Min.	Max.	Min.	Max.
Cadmium	0.025	0.07	-	0.003
Aluminium	0.10	0.50	-	0.005
Silicon	-	0.005	-	0.003
Copper	-	0.005	-	0.003
Iron	-	0.005	-	0.0014
Lead	-	0.006	-	0.003
Other Impurities
- Each	-	0.005	-	0.005
- Total	-	0.02	-	0.02
Zinc	remainder		remainder

* Corresponds to MIL-A-18001k alloy composition.