Lucel® GC240

About
High Rigidity Application Casings of Pump and Pivot Bearings&&

Product Description
SupplierLG Chemical
GenericCopolymer Polyformaldehyde
Material StatusCommercial: Active
FeaturesGood Rigidity,High elastic,HB
AvailabilitysNorth America,Latin America,Asia Pacific,Europe
Process MethodsInjection Molding

Technical Data
PHYSICALNominal valueUnitTest method
Density1.72g/cm³ASTM D792
Shrinkage rate ASTM D955
MD0.30 to 0.70%ASTM D955
TD0.30%ASTM D955

IMPACTNominal valueUnitTest method
Impact strength of cantilever beam notch
23℃120J/mASTM D256

THERMALNominal valueUnitTest method
Hot deformation temperature ASTM D648
0.45 MPa, annealed, 6.35 mm165ASTM D648
1.8 MPa, annealed, 6.35 mm165ASTM D648
Melting temperature165
Linear coefficient of thermal expansion
MD:20~80℃3.0E-51/℃ASTM D696

Electrical performanceNominal valueUnitTest method
Surface resistivity1.0E+14ohmsASTM D257
Volume resistivity1.0E+16ohms·cmASTM D257
Dielectric strength25kV/mmASTM D149
Arc resistance135secASTM D495

FLAME CHARACTERISTICSNominal valueUnitTest method
0.73 mmHB UL 94

MECHANICALNominal valueUnitTest method
Rockwell hardness
R-level87 ASTM D785
tensile strength
yield148MPaASTM D638
Tensile strain
Fracture, 23 ℃3.0%ASTM D638
Bending modulus
23℃11800MPaASTM D790
bending strength
yield276MPaASTM D790
Taber abraser
1000 cycles, 1000 g, CS-17 wheels46.0mgASTM D1044

Process Conditions
injectionNominal valueUnitTest method
Drying temperature90 to 110°C
Drying time3.0 to 6.0hr
Barrel rear temperature170 to 190°C
Barrel middle temperature190 to 210°C
Barrel front temperature200 to 220°C
Nozzle temperature200 to 220°C
Melt temperature (target)210°C
Mold temperature60 to 100°C
Injection pressure68.6 to 118MPa
Hold pressure39.2 to 83.4MPa
Back pressure0.00 to 3.92MPa
Screw speed40 to 75rpm

Notes
1. Typical properties: these are not to be construed as specifications.
2. 0.20 in/min
3. 0.051 in/min
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