There are significant differences between liquid silicone and PU (polyurethane) in terms of material properties, application fields, production processes and environmental protection. The following is a specific analysis:
1. Material properties
Liquid silicone:
Softness: Liquid silicone has extremely high softness and elasticity, comfortable touch, and can provide good cushioning and shock absorption effects.
Temperature resistance: Liquid silicone can maintain stability in a wide temperature range, and has excellent high and low temperature resistance.
Chemical corrosion resistance: It has excellent resistance to chemicals such as acids, alkalis, and solvents.
Biocompatibility: It has passed relevant certifications and can be used for medical products that directly contact human skin or are implanted in the body.
Environmental protection: It is non-toxic and odorless, meets environmental protection requirements, and can meet food grade standards.
PU (polyurethane):
Physical properties: PU materials have excellent wear resistance, tensile strength and elasticity, but compared with liquid silicone, its softness may be slightly inferior.
Weather resistance: PU materials have good weather resistance and can resist the influence of environmental factors such as ultraviolet rays and ozone.
Breathability: Some PU materials have a certain degree of breathability, but not all PU materials have this property.
Environmental protection: PU materials may use some chemical additives in the production process, and their environmental protection may be slightly worse than liquid silicone.
2. Application fields
Liquid silicone:
Medical industry: widely used in the manufacture of medical devices, such as catheters, seals, artificial organs, etc.
Consumer goods industry: used in baby products, kitchen utensils, smart wearable devices, such as baby pacifiers, baking molds, smart watch straps, etc.
Electronic industry: used as sealing materials to protect electronic components from dust, moisture and chemical erosion, such as waterproof seals for smartphones.
PU (polyurethane):
Shoemaking industry: PU materials are often used to make soles, uppers and other parts, providing good comfort and durability.
Furniture industry: used to make fillings and surface materials for furniture such as sofas and mattresses, providing soft sitting and touch.
Automotive industry: used to make car seats, interior parts, etc., to improve riding comfort and aesthetics.
Construction industry: used to manufacture insulation materials, waterproof materials, etc., to improve the energy saving and durability of buildings.
3. Production process
Liquid silicone:
Liquid silicone is usually produced by injection molding, which has the advantages of simple process flow, high product precision and high output.
PU (polyurethane):
The production process of PU materials is relatively complex, which may involve multiple steps such as foaming, coating, and molding. According to specific application requirements, PU materials can be made into soft, hard or elastomer forms.
4. Cost and price
Liquid silicone:
Due to its excellent performance and wide application fields, liquid silicone has a relatively high cost and may be expensive.
PU (polyurethane):
PU materials have a relatively low cost and are more affordable, so they are more competitive in some cost-sensitive application fields.