Technical Information - Article 01

Technical Information and Advice

Article One
Properties of zinc alloys and comparitive data for other materials

Strength Properties
Design Properties
Physical Properties

Note
These tables show mid-range properties for each of the materials listed below, at thicknesses typical of the process and the alloy; they are intended for general guidance and comparison.

	Strength Properties
		Tensile strength MPa	Elongation % in 2in (50mm)	Hardness Brinell 500-10-30S	Impact strength J
Zinc
BS1004A	pressure die cast	283	15	83	57
BS1004B	pressure die cast	324	9	92	58
ZA8	gravity cast pressure die cast	240 375	1-2 6-10	90 100	20 40
ZA12	gravity cast pressure die cast	330 400	1.5-2.5 4-7	90 100	- 30
ZA27	pressure die cast	425	2.0-3.5	120	12
Magnesium
AZ91	pressure die cast	225	2	75	3
Aluminium
LM25TF	gravity cast + HT	310	3	105	-
LM24	pressure die cast	324	3.5	80	3
Brass
DCB3	gravity cast	320	27	65	-
Bronze
PB4	gravity cast	270	2	95	-
Plastic (injected moulded)
Polypropylene		33	>100	-	-
Nylon 30% GR		120	6	-	-

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	Design Properties
		Youngs modulus GPa	Yield strength (0.2% offset) MPa	Fatigue strength MPa (limit at approx 10⁸ cycles)	Creep stress to produce 0.5% strain in 100 hrs at 100^oC* MPa	RT pseudomodulus* MPa
Zinc
BS1004A	pressure die cast	85	220	48	15	40,000
BS1004B	pressure die cast	85	290	56	-	-
ZA8	gravity cast pressure die cast	86	210	52	-	-
ZA12	gravity cast pressure die cast	82 82	260 320	- -	- -	- -
ZA27	pressure die cast	78	370	145	15	-
Magnesium
AZ91	pressure die cast	42	160	60	75	-
Aluminium
LM25TF	gravity cast + HT	71	240	95	-	-
LM24	pressure die cast	71	160	140	160	-
Brass
DCB3	gravity cast	97	105	110	-	-
Bronze
PB4	gravity cast	100	140	-	-	-
Plastic (injected moulded)
Polypropylene		1.0-1.6	-	General value for reinforced thermoplastic 30-35	-	350
Nylon 30% GR		10-11	-	General value for reinforced thermoplastic 30-35	-	600
*Calculated only for pressure die cast and injection mouled materials in these columns, but data is available for gravity cast zinc alloys.

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	Physical Properties
		Density g/cm³	Melting range ^oC	Coefficient of thermal expansion mm/m ^-1/k^-1	Thermal conductivity Wm ^-1k^-1	Electrical conductivity % IACS
Zinc
BS1004A	pressure die cast	6.7	382-387	27	113	26
BS1004B	pressure die cast	6.7	379-388	27	110	26
ZA8	gravity cast pressure die cast	6.3 6.3	375-404 375-404	23 23	115 115	28 28
ZA12	gravity cast pressure die cast	6.0 6.0	377-432 377-432	24 24	116 116	28 28
ZA27	pressure die cast	5.0	375-484	26	126	30
Magnesium
AZ91	pressure die cast	1.8	-	26	67	12
Aluminium
LM25TF	gravity cast + HT	2.7	550-615	22	150	39
LM24	pressure die cast	2.8	520-580	21	96	24
Brass
DCB3	gravity cast	8.3	885-900	21	81	18
Bronze
PB4	gravity cast	8.8	1050	18	75	10
Plastic (injected moulded)
Polypropylene		0.9	-	80-150	0.16-0.24	0
Nylon 30% GR		1.4	-	23-40	0.5	0