LCP (Liquid Crystal Polymer)
Liquid crystal polymers (LCPs) are highly crystalline aromatic polyesters with exceptional flow into thin walls, inherent flame retardancy and excellent high-frequency dielectric properties for ADAS connectors and miniaturised electronics.
Overview
Liquid crystal polymers are wholly aromatic polyester thermoplastics that form ordered melt phases, enabling extremely high flow into sub-millimetre wall sections used in fine-pitch connectors, antenna modules and LED packages. LCPs combine high heat deflection temperature, very low moisture uptake, inherent flame performance and stable dielectric constants/loss tangents at GHz frequencies — attributes that map directly to ADAS radar, camera and high-speed data connectors. Anisotropic shrinkage requires careful mould and gate design. LCPs are more expensive than PBT or PA but often displace ceramics or metalised plastics in miniaturised RF packages. This entry covers injection-moulding and film LCP grades for automotive electronics.
Automotive Applications
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Properties
Category
Type
High-Performance Polymer
Available Colors
Available Forms
Key Properties
- Extremely high flow for thin-wall moulding
- Low moisture absorption and warpage
- Excellent high-frequency dielectric properties
- Inherent flame retardancy (many grades)
- High continuous-use temperatures
- Anisotropic shrinkage — design-sensitive
Technical Specifications
Density
~1.4–1.8 g/cm³ (filled grades higher)
Tensile Strength
~100–180 MPa depending on grade and fibre fill
Temperature Resistance
Continuous use often ~200–240°C depending on grade; HDT can exceed 250°C for filled grades
Sustainability
Sustainability Rating
LCP is a specialty resin; recycling infrastructure is limited. Thin-wall designs reduce part mass. Long connector life and halogen-free FR behaviour support sustainability narratives versus brominated systems.