Liga de Zinco 3, commonly known as os fardos 3, is the most widely used zinc alloy in the fundição sob pressão indústria. Thanks to its excellent balance of **mechan industry. Thanks to its excellent balance of desempenho mecânico, castability, eficiência de custos, and surface finishing capability, it has become the default choice for manufacturers across automotive, eletrônicos, bens de consumo, e setores industriais.
Na verdade, over 70–80% of zinc die-cast components in North America are made from Zamak 3, making it the industry benchmark material.
This guide is designed for:
OEM product designers
Mechanical and electrical engineers
Procurement and sourcing professionals
If you are evaluating materials for componentes de precisão, conectores, alojamentos, or structural parts, this article will help you understand whether Zamak 3 is the right choice.
What is Zinc Alloy 3 (os fardos 3)?
os fardos 3 é a zinc-based alloy primarily used in high-pressure die casting. It belongs to the Zamak family, which derives its name from the German words:
Zink
Aluminium
Magnesium
Kupfer (Cobre)
Among all Zamak alloys, os fardos 3 is considered the standard grade due to its excellent combination of força, ductilidade, e estabilidade dimensional.
Why Zamak 3 Dominates the Market
Exceptional casting performance
Stable mechanical properties over time
Minimal internal stresses
Econômico para produção de alto volume
Compared to other zinc alloys, os fardos 3 offers a balanced profile, making it suitable for a wide range of applications without requiring material upgrades.
Chemical Composition of Zinc Alloy 3
Standard Composition
| Elemento | Contente (%) |
| Zinco (Zn) | ~96% |
| Alumínio (Al) | 3.9 – 4.3% |
| Magnésio (mg) | 0.03 – 0.06% |
| Cobre (Cu) | ≤ 0.1% |
| Ferro (Fé) | 0.03 – 0.035% |
| Liderar (Pb) | ≤ 0.004% |
| Estanho (Sn) | ≤ 0.0015% |
| Silício (E) | ≤ 0.02% |
| Níquel (Em) | ≤ 0.001% |
Role of Each Element
Understanding the role of each element is critical for engineers making material decisions:
Zinco (Zn):
Acts as the base metal, providing corrosion resistance and excellent castability.
Alumínio (Al):
Enhances strength, dureza, and fluidity during casting.
Magnésio (mg):
Improves corrosion resistance and reduces oxidation.
Cobre (Cu):
Increases strength and wear resistance but is kept low to maintain ductility.
Trace Elements (Fé, Pb, Sn, Em, E):
Carefully controlled to prevent impurities and ensure long-term stability.
Key Properties of Zinc Alloy 3
Propriedades físicas
| Propriedade | Valor |
| Melting Range | 381 – 387°C |
| Densidade | ~6.6 g/cm³ |
| Condutividade térmica | ~113 W/m·K |
| Condutividade elétrica | ~27% IACS |
| Expansão térmica | ~27.4 µm/m·K |
Engineering Significance
Baixo ponto de fusão → reduced energy consumption in casting
Alta condutividade térmica → ideal for heat dissipation components
Dimensional stability → suitable for tight tolerance parts
Propriedades mecânicas
| Propriedade | Valor |
| Resistência à tracção | ~283 MPa |
| Força de rendimento | ~221 MPa |
| Dureza | ~82 HB |
| Alongamento | ~10% |
Performance Insights
Good balance of strength and ductility
Adequado para load-bearing components
Maintains performance over time due to aging stability
Why These Properties Matter
For OEMs and engineers, these properties translate into:
Reliable performance under stress
Capability to produce geometrias complexas
Reduced risk of deformation over time
Consistent quality in mass production
Advantages of Zamak 3
Superior Castability
os fardos 3 offers excellent fluidity, permitindo que:
Fill complex molds easily
Produce thin-wall structures
Achieve high dimensional accuracy
This reduces machining requirements and lowers overall production costs.
Long-Term Dimensional Stability
Unlike some metals that deform over time, os fardos 3:
Maintains tight tolerances
Resists creep and fatigue
Ensures long service life
Isto o torna ideal para componentes de precisão.
Excellent Surface Finishing
os fardos 3 is highly compatible with:
Galvanoplastia (níquel, cromo, zinco)
Revestimento em pó
Pintura
Chromate treatment
This is critical for industries requiring aesthetic and corrosion-resistant finishes.
Custo-benefício
From a procurement perspective, os fardos 3 offers:
Lower raw material cost than many alternatives
High production efficiency in die casting
Reciclabilidade (reducing waste and cost)
This makes it a high ROI material for mass production.
Alta resistência à corrosão
os fardos 3 performs well in:
Humid environments
Outdoor conditions (with coating)
Industrial applications
Its corrosion resistance reduces maintenance and extends product lifespan.
Applications of Zinc Alloy 3
Elétrica & Indústria de eletrônicos
os fardos 3 is widely used for:
Conectores e terminais
Caixas de interruptores
Gabinetes elétricos
Por que?
It offers good conductivity, precisão, and shielding performance.
Indústria automobilística
As aplicações típicas incluem:
Suportes
Maçanetas da porta
Interior components
Engine-related parts
Key advantage: força + dimensional stability under vibration and stress.
Bens de consumo
os fardos 3 is used in:
Hardware (fechaduras, dobradiças)
Itens decorativos
Jewelry and accessories
Artigos esportivos
Its ability to achieve high-quality finishes makes it ideal for visible parts.
Equipamento industrial
Applications include:
Precision mechanical parts
Assemblies and housings
Functional components requiring tight tolerances
os fardos 3 vs Other Zinc Alloys
os fardos 3 contra os fardos 5
| Recurso | os fardos 3 | os fardos 5 |
| Força | Moderado | Mais alto |
| Ductilidade | Mais alto | Mais baixo |
| Aplicativo | General use | High strength parts |
Conclusão:
Choose Zamak 5 when strength is critical, but Zamak 3 for balanced performance.
os fardos 3 contra os fardos 7
| Recurso | os fardos 3 | os fardos 7 |
| Fluidity | Bom | Excelente |
| Casting Complexity | Padrão | Thin-wall/complex |
| Pureza | Padrão | Mais alto |
Conclusão:
os fardos 7 is better for ultra-thin or complex designs, but Zamak 3 remains more cost-effective.
When to Choose Zamak 3
os fardos 3 is the best choice when you need:
Cost efficiency
Reliable performance
Standard structural strength
Produção em alto volume
Manufacturing Considerations
Die Casting Process
os fardos 3 is primarily used in fundição sob pressão de alta pressão (HPDC):
Molten metal injected into steel molds
Rapid cooling for high productivity
Excellent surface finish
Tooling and Mold Design
Initial mold cost is higher
Ideal para large production volumes
Long mold life reduces cost per part
Shrinkage and Tolerance
Low shrinkage rate (~0.007 in/in)
Supports tight tolerances
Reduces secondary machining
Opções de acabamento superficial
Galvanoplastia (níquel, cromo)
Revestimento em pó
Pintura
These enhance appearance and corrosion resistance.
Perguntas frequentesé
1. What is Zamak 3 usado para?
os fardos 3 is used for die-cast components in automotivo, eletrônicos, hardware, e indústrias de bens de consumo.
2. Is Zamak 3 corrosion resistant?
Sim, especially when combined with surface treatments like plating or coating.
3. Can Zamak 3 be plated or painted?
Absolutamente. It is one of the best zinc alloys for surface finishing processes.
4. What is the difference between Zamak 3 e Zamac 5?
os fardos 5 offers higher strength, while Zamak 3 provides better ductility and cost efficiency.
5. Is Zamak 3 suitable for electrical components?
Sim. It offers good conductivity and precision, making it ideal for connectors and housings.
Conclusão
Liga de Zinco 3 (os fardos 3) remains the industry standard for zinc die casting devido ao seu:
Balanced mechanical properties
Excelente castabilidade
Cost efficiency
Versatility across industries
Whether you are designing a connector, bracket, Habitação, or decorative component, os fardos 3 provides a reliable and scalable solution.
Por que escolher Precisão máxima for Zamak 3 Peças
When sourcing Zamak 3 componentes, choosing the right manufacturer is critical.
No Precisão máxima, we offer:
Advanced die casting capabilities
Strict quality control (ISO standards)
Custom OEM/ODM solutions
Engineering support from design to production
Competitive pricing for bulk orders
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