Liquid Crystal Polymer (LCP) Injection Molding Services

Liquid Crystal Polymer (LCP) injection molded parts offer excellent strength, stiffness and toughness, and have excellent thermal stability, chemical resistance and flame retardancy.

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What is Liquid Crystal Polymers lastic?

LCPs have a unique molecular structure that allows them to retain their ordered structure even in the liquid phase. They exhibit excellent heat resistance, with a continuous operating temperature up to 240°C and can withstand short periods at temperatures as high as 340°C.

LCPs have high dielectric strength, sterilizability, and biocompatibility, making them suitable for medical and electrical applications. They also have excellent chemical resistance, dimensional stability, and low melt viscosity, making them ideal for injection molding.

Description

Full Name

Liquid Crystal Polymers

Process

CNC machining, Injection molding

Finishing options

Mold texturing，Pad printing，Laser engraving，Electroplating, Bead Blasting

Appearance

Clear or Transparent

Prices

Features

Density

1.52 – 1.89 g/cm³

Strengths

High Tensile Strength, High Modulus of Elasticity, Heat Resistance, Moldability

Tensile Strength

14500 – 29000 PSI

Elongation at Break

0.250 – 4.00%

Hardness

Rockwell R hardness of 105

Advantages of LCP Injection Molding

There are many benefits derived from plastic molding, Some of the advantages of the material include:

Liquid Crystal Polymer

The tensile strength of LCP, varying from 100 to 200 MPa based on its grade and processing, endows the molded parts with structural integrity.

Dimensional Stability

Liquid Crystal Polymer (LCP) Injection molded parts have extremely low shrinkage rates, typically around 0.1 – 0.4%.

Outstanding Chemical Resistance

LCPs are also resistant to extreme chemical resistance, including high temperature steam, and have a regular solid crystal structure.

Electrical Insulation

LCP has excellent electrical insulation properties. In the electronics industry, it is used to make connectors, sockets, and IC carriers.

Good Surface Finish

The good surface finish also reduces the need for additional post – processing steps to improve the appearance of the parts.

Applications of LCP Injection Molding

Electronics Industry

Connectors

Sockets

Circuit boards

Antenna Components

Automotive

Under-the-Hood Components

Fuel System Parts

Automotive Lighting

Lighting components

Medical

Surgical Instruments

Forceps, Scalpels,

Endoscopic instruments

Bone screws, Joint replacements

Aerospace and Defense

Brackets

Fasteners

Electrical connectors

Radar components

LCP Injection Molding Material Properties

Liquid Crystal Polymer Plastic Properties

Value

Tensile Strength (Yield) （MPa）

100 - 200

Flexural Modulus（GPa）

9 -23

Impact Resistance (Izod Impact, Notched)

0.937 - 3.00 ft-lb/in

Maximum Service Temperature（℃）

130 Chemical Formula

[-O-C6H4-COO-C6H4-OH-]n

Glass Transition Temperature（℃）

120 Heat Deflection Temperature（℃）

200-350

Drying Temperature（℃）

150 Drying Time（hr）

8 Mold Temperature（℃）

70～130

Melt Temperature（℃）

280～330

Injection Pressure（MPa）

50 - 150

Injection Speed（ mm/sec）

20–60

Cooling Time（S）

10 Scrap Quantity（mm）

2～6

Back Pressure（MPa）

1３～2８

Clamping Force（ton/in2）

2-5

Return Speed (rpm)

120 Shrinkage

0.1% to 0.4%

LCP Injection Molding Design Guide

Wall Thickness

LCP’s low shrinkage rate (0.1 – 0.4%) still requires consistent wall thickness to ensure even cooling and minimal warping. The recommended wall thickness usually ranges from 0.5 – 3 mm.

Radii

Generally, outside radii should be ≥ 1.5 times wall thickness, and internal radii ≥ 0.5 times. Maximize radii to cut stress concentrations and boost moldability.

Draft Angle

For LCP, a minimum draft angle of 0.5 – 1.5° is generally recommended for external surfaces and 1 – 3° for internal surfaces. The draft angle allows the part to be easily removed from the mold without getting stuck or damaged.

Rib

The thickness of the ribs should generally be about 0.5 – 0.7 times the thickness of the adjacent wall.

Gate Design

A gate that is too small can lead to high – shear rates, which may cause material degradation and poor filling. A gate that is too large can result in excessive material waste and may lead to visible gate marks on the part.

Part Tolerance

Injection molded LCP has precise, consistent tolerances due to low thermal expansion and shrinkage, especially in flow direction. Steel mold parts have tighter tolerances than aluminum-mold ones.

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