LCP Vectra: Liquid Crystal Polymer for Micro-Molding & Electronic Connectors
Published: 2026-05-26
Liquid Crystal Polymer (LCP), best known by Celanese's trade name Vectra, is a unique class of thermotropic polyesters whose rigid-rod molecular structure forms ordered domains (liquid crystal phase) in the melt—providing the lowest melt...
Liquid Crystal Polymer (LCP), best known by Celanese's trade name Vectra, is a unique class of thermotropic polyesters whose rigid-rod molecular structure forms ordered domains (liquid crystal phase) in the melt—providing the lowest melt viscosity and best flowability of any engineering thermoplastic. This enables wall thicknesses as low as 0.15 mm and flow lengths exceeding 300:1 ratio, making LCP the standard material for ultra-fine-pitch electronic connectors, micro-molded medical devices, and MEMS packaging.
LCP's highly anisotropic properties—strength and stiffness in the flow direction can be 3-5× higher than transverse to flow—require careful gate placement and mold filling analysis to orient the molecular chains in the load-bearing direction. The near-zero mold shrinkage (0.1% in flow direction) combined with a low coefficient of thermal expansion (CTE ~10 ppm/°C in flow direction, matching silicon at ~3 ppm/°C for some grades) make LCP the polymer of choice for chip packaging and fine-pitch connector bodies that must maintain dimensional stability through solder reflow profiles (peak 260°C). LCP is inherently flame retardant (UL94 V-0 at 0.3 mm thickness) and has the lowest water absorption of any thermoplastic (<0.02% at equilibrium).
Technical Properties
| Density | 1.40 g/cm³ |
|---|---|
| Tensile Strength | 180 MPa (flow direction) |
| Melting Point | 280-335 °C (grade dependent) |
| Shrinkage Rate | 0.1% (flow) / 0.4% (transverse) |
| Flexural Modulus | 12 GPa |
| Hdt | 270 °C at 1.82 MPa |
| Continuous Service Temp | 240 °C |
Engineering Tool: Shrinkage & Cost Estimator
Calculate part weight, mold cavity dimensions accounting for shrinkage, and material cost — all locally in your browser.
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| Celanese Vectra | |
| Sumitomo SumikaSuper | |
| Solvay Xydar |
Frequently Asked Questions
Why does LCP have such different properties in flow vs transverse directions?
LCP molecules are rigid rods that align in the direction of melt flow during injection mold filling—similar to logs floating down a river aligning parallel to the current. This flow-induced orientation is 'frozen in' when the polymer solidifies. In the flow direction, the covalent bonds of the aligned polymer backbones bear the load (producing 180 MPa tensile strength). Transverse to flow, the much weaker intermolecular (van der Waals) forces between adjacent polymer chains bear the load (producing only ~30 MPa). This anisotropy must be explicitly accounted for in mold design—the gate must be positioned so that the primary mechanical load aligns with the flow direction.
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References & Industry Standards
- ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
- UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
- MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
- ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org