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POM GC25A 含25%玻璃纤维增强

添加时间:2013-05-30  信息来源:http://www.simibc.com/  作者:苏州希普能塑料
泰科纳POM GC25A
 
CELCON® GC25A CD3501 BLACK
CELCON® GC25A CF3500 NATURAL
CELCON® GC25A-34 CA33595SP20 WHITE
CELCON® GC25A-34 CF3500 NATURAL
 
CELCON GC25A | POM | Glass Reinforced
 
Description
Celcon® acetal copolymer grade GC25A is a glass coupled formulation containing 25% reinforced fiber glass. This grade offers excellent strength, stiffness and heat distortion temperature with lower mold shrinkage, minimum thermal expansion, excellent dimensional stability and good moldability.
 
Chemical abbreviation according to ISO 1043-1: POM
 
Other Processing
Injection Molding
Standard reciprocating screw injection molding machines with a high compression screw (minimum 3:1 and preferably 4:1) and low back pressure (0.35 Mpa/50 PSI) are favored. Using a low compression screw (i.e.- general purpose 2:1 compression ratio) can result in unmelted particles and poor melt homogeneity. Using a high back pressure to make up for a low compression ratio may lead to excessive shear heating and deterioration of the Celcon material.
 
Melt temperature: preferred range 182-199℃ (360-390℉) Melt temperature should never exceed 230℃ (450℉).Mold surface temperature: preferred range 93-121℃ (200-250℉) especially with wall thickness less than 1.5 mm (0.060 in.). May require mold temperature as high as 120℃ (250℉) to reproduce mold surface or to assure minimal molded in stress. Wall thickness greater than 3 mm (1/8 in.) may use a cooler (65℃/150℉) mold surface temperature and wall thickness over 6 mm (1/4 in.) may use a cold mold surface down to 25℃ (80℉). In general, mold surface temperatures lower than 82℃ (180℉) may produce a hazy surface or a surface with flow lines, pits and other included defects.
 
Other Extrusion
Standard extruders with a length to diameter ratio of at least 20:1 are recommended. The screw should be a high compression ratio of at least 3:1 and preferably 4:1 to assure good melting and uniform melt homogeneity. The design should be approximately 35% each for the feed and metering sections with the remaining 30% as transition zone.
 
Melt temperature:180-220℃ (355-430℉)
 
ISO Data Mechanical properties Value Unit Test Standard
Phys Density 1580 kg/m³ ISO 1183
Mold shrinkage - parallel 0.4 % ISO 294-4
Mold shrinkage - normal 1.2 % ISO 294-4
Water absorption (23℃-sat) 0.8 % ISO 62
Humidity absorption (23℃/50%RH) 0.2 % ISO 62
Mech Mechanical properties Value Unit Test Standard
Tensile modulus (1mm/min) 8600 MPa ISO 527-2/1A
Tensile stress at break (5mm/min) 106 MPa ISO 527-2/1A
Tensile strain at break (5mm/min) 2 % ISO 527-2/1A
Flexural modulus (23℃) 8700 MPa ISO 178
Flexural strength (23℃) 160 MPa ISO 178
Charpy impact strength @ 23℃ 25 kJ/m² ISO 179/1eU
Charpy impact strength @ -30℃ 35 kJ/m² ISO 179/1eU
Charpy notched impact strength @ 23℃ 6.4 kJ/m² ISO 179/1eA
Notched impact strength (Izod) @ 23℃ 6 kJ/m² ISO 180/1A
Therm Thermal properties Value Unit Test Standard
Melting temperature (10℃/min) 165 ISO 11357-1,-2,-3
DTUL @ 1.8 MPa 160 ISO 75-1/-2
Coeff.of linear therm. expansion (parallel) 0.25 E-4/℃ ISO 11359-2
Coeff.of linear therm. expansion (normal) 1.2 E-4/℃ ISO 11359-2
SpecProd Test specimen production Value Unit Test Standard
Processing conditions acc. ISO 9988-2 - Internal
 
Processing
Pre Drying
Drying is not normally required. If material has come in contact with moisture through improper storage or handling or through regrind use, drying may be necessary to prevent splay and odor problems.
 
Drying time (h):3
Drying temperature (℃):80 - 100
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