Liquid Silicone Rubber (LSR) Products and Their Differences from Traditional Injection-Molded Products
Liquid silicone rubber (LSR) products differ significantly from traditional injection-molded products in terms of material properties, processing methods, and application areas.
1. Material Properties
Liquid Silicone Rubber (LSR):
High flexibility, heat resistance (typically exceeding 200°C), cold resistance, and chemical corrosion resistance.
Excellent biocompatibility, non-toxic, odorless, and compliant with food-grade and medical-grade certifications.
Superior weather resistance and anti-aging properties, ideal for long-term use.
Traditional Injection-Molded Products (Thermoplastics, e.g., ABS, PP, PC):
Higher mechanical strength, suitable for structural components.
More susceptible to temperature fluctuations, with lower heat resistance compared to LSR.
May release harmful substances, unsuitable for high-safety applications (e.g., medical or food-contact uses).
2. Processing Methods
Liquid Silicone Rubber Molding (LIM):
Uses liquid injection molding: A/B-component LSR is mixed, injected into a mold, and vulcanized (cured) under high temperatures.
The liquid material’s excellent flow properties enable precision molding of complex geometries without secondary machining.
Traditional Injection Molding:
Thermoplastics are melted, injected into a mold, and solidified via cooling.
Suitable for high-volume production but may require additional sliders or post-processing for intricate designs.
3. Application Areas
LSR Products:
Medical devices: Catheters, seals, artificial organs.
Baby and maternal products: Pacifiers, silicone spoons.
Electronics: Waterproof seals, silicone keypads.
High-temperature and durable components: Automotive parts, sealing rings.
Traditional Injection-Molded Products:
Industrial components: Housings, gears.
Automotive and electronics: Dashboards, plastic connectors.
Consumer goods: Plastic containers, household items.
