Historical
ASTM B240-07e1
Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloys in Ingot Form for Foundry and Die Castings
1.1 This specification covers commercial zinc and zinc-aluminum (ZA) alloys in ingot form for remelting for the manufacture of pressure die castings, foundry castings and continuous cast bar stock as designated and specified in Table 1. Seven alloy compositions are specified, designated as follows:
| Common | Traditional | ASTMA | UNSA |
| Alloy 3 | Zamak 3 | AG 40A | Z33521 |
| Alloy 7 | Zamak 7 | AG 40B | Z33522 |
| Alloy 5 | Zamak 5 | AC 41A | Z35530 |
| Alloy 2 | Zamak 2 | AC 43A | Z35540 |
| ZA-8 | ZA-8 | ... | Z35635 |
| ZA-12 | ZA-12 | ... | Z35630 |
| ZA-27 | ZA-27 | ... | Z35840 |
| __________ |
A See Table 1, footnote B.
1.2 Zinc alloys Z33521, Z33522, Z35530, and Z35540 are used primarily for remelting in the manufacture of pressure die castings. Zinc-aluminum alloys Z35635, Z35630, and Z35840 are used for remelting in the manufacture of both foundry and pressure die castings. Castings made from these ingots are specified in Specification B 86
1.3 The values stated in inch-pound units are to be regarded as standard.
1.4 Systems of nomenclature used to designate zinc and zinc-aluminum (ZA) alloys used for casting are described in Appendix X1.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.
TABLE 1 Chemical and North American Color Code Requirements
| Alloy 3 A, B, C, D | Alloy 7 A, B, C, D | Alloy 5 A,B ,C ,D | Alloy 2 A,B ,C,D | ZA-8 B, C, E | ZA-12 B, C, E | ZA-27 B, C, E | |
| Zamak 3 | Zamak 7 | Zamak 5 | Zamak 2 | ZA-8 | ZA-12 | ZA-27 | |
| (AG40A) | (AG40B) | (AC41A) | (AC43A) | ||||
| Z33521 | Z33522 | Z35530 | Z35540 | Z35635 | Z35630 | Z35840 | |
| Color CodeF | None | Brown | Black | Green | Blue | Orange | Purple |
| Element | |||||||
| Aluminum | 3.9-4.3 | 3.9-4.3 | 3.9-4.3 | 3.9-4.3 | 8.2-8.8 | 10.8-11.5 | 25.5-28.0 |
| Magnesium | 0.03-0.06 | 0.010-0.020 | 0.03-0.06 | 0.025-0.05 | 0.02-0.03 | 0.02-0.03 | 0.012-0.020 |
| Copper | 0.10 max | 0.10 max | 0.7-1.1 | 2.7-3.3 | 0.9-1.3 | 0.5-1.2 | 2.0-2.5 |
| Iron, Max | 0.035 | 0.075 | 0.035 | 0.035 | 0.035 | 0.05 | 0.07 |
| Lead, Max | 0.0040 | 0.0030 | 0.0040 | 0.0040 | 0.005 | 0.005 | 0.005 |
| Cadmium, Max | 0.0030 | 0.0020 | 0.0030 | 0.0030 | 0.005 | 0.005 | 0.005 |
| Tin, Max | 0.0015 | 0.0010 | 0.0015 | 0.0015 | 0.002 | 0.002 | 0.002 |
| Nickel | - - - | 0.005-0.020 | - - - | - - - | - - - | - - - | - - - |
| ZincG | Remainder | Remainder | Remainder | Remainder | Remainder | Remainder | Remainder |
A Zinc alloy ingot for die casting may contain nickel, chromium, silicon, and manganese in amounts of up to 0.02, 0.02, 0.035 and 0.05 %, respectively. No harmful effects have ever been noted due to the presence of these elements in up to these concentrations and, therefore, analyses are not required for these elements, except that nickel analysis is required for Z33522.
B ASTM alloy designations were established in accordance with Practice B 275
C For purposes of acceptance and rejection, the observed value or calculated value obtained from analysis should be rounded to the nearest unit in the last right-hand place of figures, used in expressing the specified limit, in accordance with the rounding procedure prescribed in Practice E 29.
D When this material is required to conform to ISO Standard 301, the chemical limits for thallium and indium each shall not exceed 0.001 %.
E Zinc-aluminum ingot for foundry and pressure die casting may contain nickel, chromium, and manganese in amounts of up to 0.01 % each or 0.03 % total. No harmful effects have ever been noted due to the presence of these elements in up to these concentrations and, therefore, analyses are not required for these elements.
F Refer to Practice B 908
G Determined arithmetically by difference.
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