LCP Liquid Crystal Polymer Guide: Type I II III Grades, Vectra Zenite Properties, and LCP vs PPS vs PEEK

What Is LCP?

LCP (Liquid Crystal Polymer) occupies a unique position in the engineering polymers hierarchy. It is not a nylon, not a polyester in the conventional sense, and not a filled compound — LCP is a wholly aromatic polyester that forms ordered, rod-like molecular structures in the melt state. When LCP flows into a mold, those rigid molecular rods align along the flow direction, giving the molded part an effect analogous to self-reinforcement: tensile modulus and strength along the flow axis far exceed what the resin’s density and composition suggest.

The practical result: HDT values exceeding 300°C, thermal expansion coefficients comparable to steel (1–3 × 10⁻⁶/°C), wall-thickness capability down to 0.1 mm, and inherent UL94 V-0 flammability without additive loading. No other thermoplastic combines this set of properties at LCP’s price point.

For engineers and buyers searching for LCP datasheets, Vectra vs Zenite grade comparisons, LCP vs PPS vs PEEK selection guidance, or LCP thin-wall molding parameters, this page consolidates the key specifications, grades, processing windows, and application data.

LCP Type Classification: I, II, III

The LCP family is divided into three types based on heat deflection temperature (HDT), which is driven by the monomer chemistry and resulting backbone rigidity.

Тип	HDT Range (°C)	Base Chemistry	Example Brand	Key Feature	Typical Use
Type I	250–350	Para-hydroxybenzoic acid + biphenol + terephthalic acid	Xydar (Solvay), Ekonol	Highest heat resistance, can survive 300°C+ continuous	Ovenware, aerospace, high-temp connectors
Type II	180–240	Para-hydroxybenzoic acid + 6-hydroxy-2-naphthoic acid	Vectra (Celanese), Zenite (Celanese)	Best balance of processability, properties, and cost	Electronics connectors, SMT, 5G components
Type III	60–210	Ethylene terephthalate + para-hydroxybenzoic acid	X7G, Rodrun	Lowest cost, lowest heat — used where flow matters more than T	Thin-wall consumer goods, fibers

In practice, Type II (Vectra/Zenite) dominates commercial injection molding — roughly 80% of LCP consumption falls here. Type I is reserved for the highest-temperature applications where cost is secondary. Type III has largely been displaced by Type II as processors gained experience with the higher-temperature grades.

LCP GF30 Typical Properties

Недвижимость	Test Method	LCP GF30 (Type II)	LCP Unfilled (Type II)
Плотность	ISO 1183	1.62 g/cm³	1.40 g/cm³
Температура плавления	ISO 11357	280°C	280°C
HDT @ 1.80 MPa	ISO 75	240–260°C	190–210°C
Tensile Modulus (flow direction)	ISO 527	15,000 MPa	10,000 MPa
Tensile Modulus (transverse)	ISO 527	5,000 MPa	3,000 MPa
Tensile Strength (flow direction)	ISO 527	180 MPa	180 MPa
Tensile Strength @ 200°C	ISO 527	~150 МПа	N/A
Удлинение при разрыве	ISO 527	1.5–2.5%	1.5–3.0%
Модуль упругости	ISO 178	13,000 MPa	9,000 MPa
Charpy Notched Impact +23°C	ISO 179/1eA	15–25 kJ/m²	20–30 kJ/m²
CTE (flow direction)	ISO 11359	1–3 × 10⁻⁶/°C	1–5 × 10⁻⁶/°C
CTE (transverse)	ISO 11359	15–30 × 10⁻⁶/°C	25–50 × 10⁻⁶/°C
Water Absorption (23°C, 24h)	ISO 62	< 0.05%	< 0.05%
Flammability (UL94)	UL94	V-0 @ 0.2 mm	V-0 @ 0.2 mm
Усадка пресс-формы (расход)	ISO 294-4	0.0–0.2%	0.0–0.3%
Mold Shrinkage (transverse)	ISO 294-4	0.4–0.7%	0.5–0.9%
Dielectric Constant @ 1 GHz	IEC 60250	3.5–4.0	3.0–3.5
Dissipation Factor @ 1 GHz	IEC 60250	0.005–0.010	0.003–0.008

LCP vs. PPS vs. PEEK: High-Temperature Thermoplastics Showdown

LCP, PPS, and PEEK are the three most frequently cross-shopped materials in the >200°C thermoplastic space. The table below shows why none of them displaces the others entirely — each material has a performance-cost profile that matches a specific application envelope.

Недвижимость	LCP GF30	PPS GF40	PEEK 30% GF
Плотность	1.62 g/cm³	1.65 g/cm³	1.49 g/cm³
HDT @ 1.80 MPa	240–260°C (Type II) 300–350°C (Type I)	265°C	315°C
Continuous Use Temp	200–240°C (Type II) 260–300°C (Type I)	200–220°C	250°C
CTE (flow direction)	1–3 × 10⁻⁶/°C	15–25 × 10⁻⁶/°C	15–25 × 10⁻⁶/°C
Tensile Modulus @ 200°C	~10,000 MPa	~12,000 MPa	~8,000 MPa
Tensile Strength @ 200°C	~150 МПа	~130 MPa	~120 МПа
Impact Toughness @ RT	Low (15–25 kJ/m²)	Moderate (25–40 kJ/m²)	High (50–70 kJ/m²)
Flammability	V-0 inherent (no additives)	V-0 (with additives)	V-0 (with additives)
Water Absorption	< 0.05%	0.03%	0.1%
Химическая стойкость	Excellent (acids, solvents)	Excellent (nearly universal below 200°C)	Excellent (except strong acids)
Weld Line Strength	Poor (inherently weak)	Fair	Хорошо
Wall Thickness Minimum	0.1 mm	0.3 mm	0.5 mm
Processing Temp	300–350°C	320–340°C	380–400°C
Mold Temp	80–120°C	130–150°C	170–200°C
Relative Cost / kg	$$$	$$	$$$$
Лучшее для	Ultra-thin-wall electronics, CTE-critical, SMT	Chemical plant, hot water, structural	Maximum toughness, medical implants, structural aerospace

Decision Rules

Choose LCP when: You need CTE near steel (1–3 ppm/°C), walls thinner than 0.3 mm, or inherent V-0 without property trade-offs. Electronics connectors, SIM trays, and 5G antenna substrates are LCP’s home turf.
Choose PPS when: Chemical resistance is paramount (especially hot water, steam, or aggressive acids at 150°C+), you need better toughness than LCP, and CTE is less critical. PPS is also roughly 30–40% cheaper per kilogram than LCP.
Choose PEEK when: Toughness is non-negotiable, continuous use approaches 250°C, or biocompatibility is required. PEEK is the only option in this group for load-bearing medical implants, and it tolerates steam sterilization better than either LCP or PPS.

LCP Commercial Grade Selector

Manufacturer	Brand	Класс	GF %	Тип	Key Feature	Typical Application
Celanese	Vectra	A130	30%	II	General-purpose GF30, standard flow	Connectors, bobbins, coil forms
Celanese	Vectra	E130i	30%	II	Improved weld-line strength, higher toughness	Complex connector geometries
Celanese	Vectra	A150	50%	II	Maximum stiffness, lowest shrinkage	High-rigidity structural electronics
Celanese	Vectra	A230	30% carbon fiber	II	Conductive, high stiffness	ESD-sensitive electronics
Celanese	Vectra	E820i Pd	40% (GF+mineral)	II	Platable grade, LDS-compatible	3D-MID circuits, antenna substrates
Celanese	Vectra	E830i Pd	30% GF	II	Platable, FDA compliant	Medical device housings
Celanese	Zenite	6130L	30%	II	Low warp, balanced flow	SMT connectors, DDR sockets
Celanese	Zenite	6145L	45%	II	Low warp, high stiffness	Long, thin connectors
Polyplastics	Laperos	A130	30%	II	Standard GF30, high flow	Consumer electronics
Solvay	Xydar	G-930	30%	I	Type I GF30 — 300°C+ HDT	Oven components, aerospace connectors
Solvay	Xydar	G-945	45%	I	Type I max stiffness	High-temp structural
Sumitomo	SUMIKASUPER	E6000	30%	II	Ultra-low dielectric for 5G	5G antenna substrates, mmWave
Toray	Siveras	LX70G30	30%	II	Improved toughness GF30	USB-C connectors, camera modules

Processing LCP: Injection Molding Parameters

Parameter	Рекомендуемое значение	Примечания
Pre-drying	140–160°C for 4 hours	Desiccant dryer required. Target moisture < 0.01%
Melt Temperature	300–350°C	Type II grades; Type I requires 350–400°C
Температура пресс-формы	80–120°C	Lower than PPA or PEEK — water-heated molds often sufficient
Injection Speed	Fast	LCP solidifies rapidly — fill speed is critical for thin walls
Holding Pressure	40–60 MPa	LCP shrinkage is near-zero in flow direction; pack lightly
Residence Time	Minimize (≤ 10 min)	LCP is thermally stable but extended residence reduces properties

Critical processing insights:

Weld lines are the Achilles’ heel: LCP’s highly oriented molecular structure creates inherently weak weld lines — strength at a weld line can be 30–50% of the bulk value. Gate placement is more consequential for LCP than for any other engineering thermoplastic. When possible, design parts to avoid weld lines in load-bearing regions, or use multi-gate sequential valve gating to knit fronts under pressure.
Drying is mandatory: Although LCP absorbs almost no water at room temperature, any surface moisture on pellets hydrolyzes the polymer at 330°C. The 0.01% moisture target is stricter than for most engineering polymers.
Anisotropy is designed-in: LCP’s mechanical properties are inherently anisotropic — strong in the flow direction, weaker transversely. Part design must account for this. Where isotropy is needed, consider mineral-filled or specialty grades, but expect a stiffness penalty.
Low shrinkage, high precision: Near-zero shrinkage in the flow direction means LCP molds can hold extraordinarily tight tolerances — but this also means the mold cavity must be cut to essentially final dimensions. No “sizing factor” allowance like with polyolefins.
Fast cycle times: LCP solidifies almost instantly upon contacting the mold wall. Cycle times of 2–5 seconds for small electronic connectors are routine — this is LCP’s single greatest processing advantage.

Key LCP Applications

Промышленность	Application	Driving Property
Бытовая электроника	SIM card trays, USB-C connectors, DDR memory sockets, camera module housings	Thin-wall (0.1–0.3 mm), V-0, survives reflow, CTE match to copper
5G / Telecommunications	Antenna substrates, mmWave lens arrays, base station connector bodies	Low Dk/Df at GHz frequencies, dimensional stability
Автомобили	Ignition coil bobbins, transmission speed sensors, relay bases	Heat resistance, oil resistance, electrical insulation
Медицина	Surgical instrument handles, dental tool bodies, catheter components	Steam sterilizable, chemical resistance, dimensional precision
Fiber Optics	Optical fiber connectors (MT, MPO ferrules), alignment sleeves	CTE match to glass fiber, micromolding precision
Аэрокосмическая промышленность	High-temperature connector inserts, waveguide components, radome structures	Type I grades: 300°C+ service, low outgassing, lightweight
Промышленность	Pump wear rings, chemical valve seats, bearing cages (high-temp)	Chemical resistance at 150°C+, dimensional stability in aggressive media

LCP Limitations

Weld line weakness: This cannot be overstated. If your part has converging melt fronts in a stressed area, LCP is probably not the right material. Weld line strength in LCP is worse than PPS, far worse than PA66.
Low impact toughness: Unfilled and GF LCP grades are inherently brittle. Charpy notched values of 15–25 kJ/m² make them unsuitable for snap-fit applications or parts subject to impact loads.
Anisotropic properties: Tensile modulus can vary 3:1 between the flow direction and transverse direction. This is manageable when the mold designer knows it, but problematic if the part was designed for an isotropic material.
Cost: LCP costs 3–6× a standard PA66 GF30 and roughly 2× PPS GF40. You are paying for the unique combination of CTE, thin-wall capability, and inherent V-0.
Limited colorability: LCP is typically black or natural. Light colors are difficult due to the high processing temperatures.
Notch sensitivity: LCP’s sharp notches propagate cracks readily. Avoid sharp internal corners in part design.

ЧАСТО ЗАДАВАЕМЫЕ ВОПРОСЫ

What does LCP stand for in plastics?

LCP stands for Liquid Crystal Polymer. The name comes from the material’s unique behavior: even in the molten state, LCP molecules maintain a degree of orientational order (a “liquid crystalline” phase), unlike conventional polymers whose molecules are randomly coiled when melted. This liquid-crystalline melt structure is what gives LCP its extreme flowability, self-reinforcing properties, and low thermal expansion.

What is the difference between LCP Type I, II, and III?

The three types are distinguished by heat deflection temperature (HDT): Type I (250–350°C, e.g., Xydar) for the highest-temperature applications like aerospace; Type II (180–240°C, e.g., Vectra, Zenite) for general-purpose electronics and automotive, which represents the majority of commercial LCP consumption; and Type III (60–210°C, e.g., X7G) which is a lower-cost variant now mostly displaced by Type II.

Is LCP better than PEEK?

“Better” depends on the requirement. LCP has higher flow-direction stiffness at 200°C, lower CTE (1–3 vs. 15–25 ppm/°C), faster cycle times (2–5 seconds vs. 30+ seconds), and lower per-kilogram cost than PEEK. PEEK has dramatically better impact toughness (50–70 vs. 15–25 kJ/m²), higher continuous-use temperature (250°C vs. 200–240°C), and weld line strength far exceeding LCP. If your part has converging melt fronts under load, choose PEEK. If it’s a thin-wall electronic connector needing CTE match and V-0, LCP wins.

Can LCP replace metal?

In specific applications, yes. LCP’s CTE of 1–3 × 10⁻⁶/°C matches steel and copper better than any other unfilled thermoplastic. This is why LCP has replaced metal in SIM card trays, camera module housings, and optical fiber ferrules — the part maintains dimensional compatibility with metal and glass components across assembly and operating temperatures.

Does LCP absorb water?

No — and this is one of LCP’s defining advantages. Water absorption is below 0.05%, meaning LCP parts neither swell in humid environments nor require conditioning before use. Combined with its near-zero flow-direction mold shrinkage, this makes LCP the go-to material for parts that must arrive at assembly with tight tolerances regardless of shipping or storage humidity.

What is the maximum temperature for LCP?

Type II LCP (Vectra/Zenite) has a continuous-use rating of 200–240°C, with short-term excursions to 260°C for lead-free reflow soldering. Type I LCP (Xydar) can sustain 260–300°C continuous. The melting point for Type II is approximately 280°C; for Type I it exceeds 350°C.

Need LCP pellets, Vectra or Zenite datasheets, or help selecting the right LCP grade? We supply GF-carbon, platable, and low-warp LCP grades from Celanese, Polyplastics, and Sumitomo. Contact us with your part geometry, temperature, and electrical requirements.