Hostaform® C 2521 LS

About
POM copolymer Stiff-flowing type for injection molding and extrusion with high impact toughness and good tracking resistance over a high range of temperature; good chemical resistance to solvents, fuel and strong alkalis as well as good hydrolysis resistance; high resistance to thermal and oxidative degradation. This grade has been specially stabilized to prevent discoloration and deterioration of mechanical properties from ultraviolet light exposure. The material is available in natural, black and colored. Burning rate ISO 3795 and FMVSS 302 < 75 mm/min for a thickness more than 1 mm. Ranges of applications: injection molding thick-walled, void-free molded parts; extrusion e.g. for boards and pipes. FMVSS = Federal Motor Vehicle Safety Standard (USA)&&

Product Description
SupplierCelanese
GenericCopolymer Polyformaldehyde
Material StatusCommercial: Active
FeaturesAlkali resistant,High impact resistance,Solvent resistance,Fuel resistance,HB
AvailabilitysNorth America,Europe
Process MethodsInjection Molding

Technical Data
MECHANICALNominal valueUnitTest method
Tensile modulus2600MPaISO 527-2/1A/1
tensile strength
yield62.0MPaISO 527-2/1A/50
Tensile strain
yield9.0%ISO 527-2/1A/50
Nominal tensile fracture strain32%ISO 527-2/1A/50
Tensile Creep Modulus(1 hr)2300MPaISO 899-1
Tensile creep modulus
1000 hr1100MPaISO 899-1
Bending modulus
23℃2500MPaISO 178

IMPACTNominal valueUnitTest method
Charpy Notched Impact Strength ISO 179/1eA
-30℃7.0kJ/m²ISO 179/1eA
23℃8.5kJ/m²ISO 179/1eA
Charpy Unnotch Impact strength ISO 179/1eU
-30℃200kJ/m²ISO 179/1eU
23 ℃, localized fracture220kJ/m²ISO 179/1eU

THERMALNominal valueUnitTest method
Hot deformation temperature
1.8 MPa, unannealed101ISO 75-2/A
Melting temperature165ISO 11357-3
Linear coefficient of thermal expansion
MD1.1E-41/℃ISO 11359-2

Electrical performanceNominal valueUnitTest method
Surface resistivity1.0E+14ohmsIEC 60093
Volume resistivity1.0E+14ohms·cmIEC 60093
Dielectric strength35kV/mmIEC 60243-1
Relative permittivity IEC 60250
100 Hz4.00 IEC 60250
1 MHz4.00 IEC 60250
Dissipation factor IEC 60250
100 Hz1.5E-3 IEC 60250
1 MHz5.0E-3 IEC 60250
Compared to the leakage tracing index600VIEC 60112

FLAME CHARACTERISTICSNominal valueUnitTest method
Flame retardant level UL 94
1.50 mmHB UL 94
3.00 mmHB UL 94

PHYSICALNominal valueUnitTest method
Density1.41g/cm³ISO 1183
Melt Volume Rate
190℃,2.16 kg2.50cm³/10minISO 1133
Shrinkage rate ISO 294-4
TD1.8%ISO 294-4
MD2.1%ISO 294-4
Water absorption rate
Saturation, 23 ℃0.65%ISO 62
Density of Melt1.200g/cm³Internal Method
Specific Heat Capacity of Melt2210J/kg/℃Internal Method
Thermal Conductivity of Melt0.16W/m/KInternal Method

Process Conditions
injectionNominal valueUnitTest method
Drying temperature120 to 140°C
Drying time3.0 to 4.0hr
Recommended maximum moisture content0.15%
Hopper temperature20 to 30°C
Barrel rear temperature170 to 180°C
Barrel middle temperature180 to 190°C
Barrel front temperature190 to 200°C
Nozzle temperature190 to 210°C
Processing (melt) temperature190 to 210°C
Mold temperature80 to 120°C
Injection pressure60.0 to 120MPa
Injection speedSlow-Moderate 
Hold pressure60.0 to 120MPa
Back pressure0.00 to 4.00MPa
Ejection temperature140°C

Notes
1. Typical properties: these are not to be construed as specifications.
2. 30s
3. 10°C/min
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