佳 盼 塑 胶
JIA PAN SU JIAO
/ Product details
/ classification
POM GC25T 含25%玻纤增强,FDA未评级,高强度,化学耦合
CELCON® GC25T CC34390SP20 GRAY 856
CELCON® GC25T CC34744SP200 GRAY
CELCON® GC25T CF3500 NATURAL
CELCON GC25T | POM | Glass Reinforced
Description
Celcon® GC25T is a 25% glass fiber coupled acetal copolymer grade. It offers higher strength than the standard Celcon GC25-A. Celcon GC25T is FDA approved. Celcon GC25T is also exceptionally resistant to fuel. It offers excellent resistance to transportation fuels especially oxygenated fuels.
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 |
1570 |
kg/m³ |
ISO 1183 |
|
Mold shrinkage - parallel |
0.4 |
% |
ISO 294-4 |
|
|
Mold shrinkage - normal |
0.8 |
% |
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) |
8630 |
MPa |
ISO 527-2/1A |
|
|
Tensile stress at break (5mm/min) |
129 |
MPa |
ISO 527-2/1A |
|
|
Tensile strain at break (5mm/min) |
3 |
% |
ISO 527-2/1A |
|
|
Flexural modulus (23℃) |
8520 |
MPa |
ISO 178 |
|
|
Flexural strength (23℃) |
202 |
MPa |
ISO 178 |
|
|
Charpy impact strength @ 23℃ |
50 |
kJ/m² |
ISO 179/1eU |
|
|
Charpy impact strength @ -30℃ |
55 |
kJ/m² |
ISO 179/1eU |
|
|
Charpy notched impact strength @ 23℃ |
8.7 |
kJ/m² |
ISO 179/1eA |
|
|
Charpy notched impact strength @ -30℃ |
7.2 |
kJ/m² |
ISO 179/1eA |
|
|
Notched impact strength (Izod) @ 23℃ |
8 |
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 |
161 |
℃ |
ISO 75-1/-2 |
|
|
Coeff.of linear therm. expansion (parallel) |
0.27 |
E-4/℃ |
ISO 11359-2 |
|
|
Coeff.of linear therm. expansion (normal) |
1.25 |
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
