Volume 4 - Loctite.ph

Liquid Crystal Polymer (LCP)ThermoplasticTrade Names• Granlar• HX Series• Vectra• XydarManufacturerGranmont Inc.E.I. DuPontHoescht CelaneseAmoco Performance ProductsGeneral DescriptionLiquid crystal polymers (LCP), properly called wholly aromaticcopolyesters, can be based on terephthalic acid, p,p-dihydroxybiphenyl,and p-hydroxybenzoic acid. The compounds react to form tightlypacked, rigid polymer chains consisting of long, flat monomeric units.LCP’s resistance to weathering, radiation, burning, and almost allchemicals, as well as its outstanding strength at extreme temperatures,makes it a suitable replacement for most other engineering materials,including metals and ceramics. Specialty grades available include glass,carbon, and mineral filled, as well as wear resistant, colored, andalloyed. In 2004, the price of LCP ranged approximately from $8.00 to$12.00 per pound at truckload quantities.General PropertiesLCP has outstanding mechanical properties at both ambient andextreme temperatures. For example, LCP can have a tensile modulusas high as 1.20x10 6 psi (8.4x10 4 kg/cm 2 ) at 575°F (308°C), whichexceeds that of most other engineering thermoplastics at roomtemperature. Grades of LCP have tensile strengths in excess of20,000 psi (1400 kg/cm 2 ), a compressive strength of more than 6,000psi (422 kg/cm 2 ), and its mechanical properties improve at subzerotemperatures. LCP is resistant to virtually all chemicals, includingacids, organic hydrocarbons, and boiling water. It is attacked byconcentrated, boiling caustics but is unaffected by milder solutions.LCP is also unaffected by ionizing and Cobalt 60 radiation up to 10billion rads, it withstands high levels of UV radiation, and istransparent to microwaves. It is an electrical insulator with good arcresistance, is UL rated for continuous electrical service at 464°F(240°C), and can be used for applications with intermittenttemperatures up to 600°F (316°C). LCP is inherently flame resistant,rated UL94 V-0, and will not sustain combustion. It has remarkablethermal oxidative stability with a decomposition temperature ofgreater than 1000°F (550°C) in air.Typical Properties of Liquid Crystal Polymer (LCP)American EngineeringProcessing Temperature 500°F to 700°F 260°C to 371°CLinear Mold Shrinkage 0.001 to 0.002 in./in. 0.001 to 0.002 cm/cmMelting Point 530°F to 670°F 277°C to 354°CDensity 93.0 to 111.7 lb./ft. 3 1.49 to 1.79 g/cm 3Tensile Strength, Yield 21.5 to 30.0 lb./in. 2 x 10 3 15.1 to 21.1 kg/cm 2 x 10 2Tensile Strength, Break 9.0 to 30.0 lb./in. 2 x 10 3 6.3 to 21.1 kg/cm 2 x 10 2Elongation, Break 1.0 to 3.0% 1.0 to 3.0%Tensile Modulus 14.6 to 32.0 lb./in. 2 x 10 5 10.3 to 22.5 kg/cm 2 x 10 4Flexural Strength, Yield 13.7 to 27.0 lb./in. 2 x 10 3 9.6 to 26.0 kg/cm 2 x 10 2Flexural Modulus 13.9 to 23.2 lb./in. 2 x 10 5 9.8 to 16.3 kg/cm 2 x 10 4Compressive Strength 6.5 to 11.6 lb./in. 2 x 10 3 4.6 to 8.2 kg/cm 2 x 10 2Izod Notched, R.T. 0.7 to 3.1 ft.-lb./in. 3.8 to 16.7 kg cm/cmHardness R95 - R110 Rockwell R95 - R110 RockwellThermal Conductivity 0.9 to 3.1 BTU-in./hr.-ft. 2 -°F 0.13 to 0.45 W/m-°KLinear ThermalExpansionDeflection Temperature@ 264 psiDeflection Temperature@ 66 psiContinuousService Temperature0.1 to 1.5 in./in.-°F x 10 -5 0.2 to 2.7 cm/cm-°C x10 -5350°F to 660°F 170°C to 349°CTypical Applications• Electrical – Stator insulation, rotors, boards for motors,burn-in sockets, interface connectors• Heavy Industry – Chemical process and oil field equipmentSI– –– –Dielectric Strength 550 to 900 V/10 -3 in 2.2 to 3.5 V/mm x 10 4Dielectric Constant@ 1 MHzDissipation Factor@ 1 MHzWater Absorption,24 hr.3.1 to 4.3 3.1 to 4.30.020 to 0.030 0.020 to 0.0300.01 to 0.10% 0.01 to 0.10%32The Loctite ® Design Guide for Bonding Plastics, Volume 4