Plastic injection molding is one of the most versatile and widespread manufacturing processes in the industry, capable of producing components with complex geometries, high repeatability, and quality finishes. The choice of material is a critical factor that directly influences the mechanical performance, aesthetics, durability, and cost of the parts.
At Gestión de Compras, we have extensive experience as manufacturers of plastic components using injection molding, working with the most in-demand materials on the market and advising our customers on selecting the optimal option according to the technical and economic needs of each project.
Below, we present the 10 most popular materials in injection molding, along with their main characteristics and typical applications.
1. Polypropylene (PP)
Lightweight, resistant to fatigue and chemicals. Ideal for automotive parts, packaging, hinges, and household components.
2. Acrylonitrile Butadiene Styrene (ABS)
High impact resistance and good aesthetic properties. Widely used in electronic device housings, automotive interior parts, and consumer products.
3. High-Density Polyethylene (HDPE)
Excellent chemical resistance and high toughness. Used in industrial packaging, lids, pipe components, and tanks.
4. Low-Density Polyethylene (LDPE)
High flexibility and impact resistance. Used in parts that require malleability, such as flexible lids, containers, and technical bags.
5. Polyvinyl Chloride (PVC)
Outstanding rigidity and chemical resistance. Used in profiles, pipe fittings, and construction parts.
6. Polystyrene (PS)
Easy to process and economical. Common applications: food packaging, single-use parts, and lightweight housings.
7. Polycarbonate (PC)
Optical transparency and high impact resistance. Suitable for safety parts, lighting, visors, and medical applications.
8. Polyamide (PA, Nylon)
High mechanical and thermal strength, good wear resistance. Used in gears, structural components, and parts exposed to friction.
9. Polyetheretherketone (PEEK)
High-performance thermoplastic with excellent thermal and chemical resistance. Applications in aerospace, high-end automotive, and medical devices.
10. Thermoplastic polyurethane (TPU)
Flexible, abrasion-resistant, and weather-resistant. Ideal for gaskets, technical wheels, coatings, and elastic parts.
Key factors in selecting material for injection molding
Choosing the right material for an injection molding project does not depend solely on mechanical properties or cost per kilogram. At Gestión de Compras, we evaluate a set of technical and production factors that ensure the optimal balance between performance, cost, and manufacturing feasibility:
- Mechanical strength and toughness: materials such as ABS or polycarbonate offer good impact resistance, while PEEK excels in high mechanical load environments.
- Thermal behavior: service temperature and dimensional stability at different thermal ranges are crucial, especially in automotive and electrical applications.
- Chemical resistance: exposure to oils, fuels, solvents, or cleaning agents may require specific materials such as polyamides or PBT.
- Processability and shrinkage: good material flow in the mold reduces defects and ensures precise tolerances.
- Aesthetics and surface finish: colors, textures, and the possibility of subsequent finishes (painting, metallization, screen printing).
- Regulations and certifications: in sectors such as food or healthcare, it is essential that the material complies with specific standards such as FDA or ISO.
📄 Download our plastic injection case study document to see real examples, with production data and results, and discover how we have helped companies in sectors such as automotive, construction, and electronics to optimize their parts.
At Gestión de Compras, we combine technical expertise, in-house manufacturing capacity, and knowledge of materials to offer comprehensive injection molding solutions, from the design phase to final delivery.
