點擊圖片查看大圖CELCON® GB25 CD3501 BLACK
CELCON® GB25 CF3500 NATURAL
CELCON GB25 | POM | Glass Reinforced
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Celcon® GB25 acetal copolymer is a 25% glass bead filled grade for low shrinkage and warp resistance in large, flat and thin walled parts.
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 material.
Melt Temperature: Preferred range 182-199℃ (360-390℉). Melt temperature should never exceed 230℃ (450℉).
Mold Surface Temperature: Preferred range 82-93℃ (180-200℉) 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 3mm (1/8 in.) may use a cooler (65℃/150℉) mold surface temperature and wall thickness over 6mm (1/4 in.) may use a cold mold surface down to 25℃ (80℉). In general, mold surface temperatures lower than 82℃ (180℉) may hinder weld line formation and produce a hazy surface or a surface with flow lines, pits and other included defects that can hinder part performance.
| ISO Data | Mechanical properties | Value | Unit | Test Standard |
| Phys | Density | 1580 | kg/m³ | ISO 1183 |
| Melt volume rate (MVR) | 13 | cm³/10min | ISO 1133 | |
| MVR test temperature | 190 | ℃ | ISO 1133 | |
| MVR test load | 2.16 | kg | ISO 1133 | |
| Mold shrinkage - parallel | 1.5 | % | ISO 294-4 | |
| Mold shrinkage - normal | 1.3 | % | ISO 294-4 | |
| Water absorption (23℃-sat) | 0.65 | % | ISO 62 | |
| Humidity absorption (23℃/50%RH) | 0.2 | % | ISO 62 | |
| Mech | Mechanical properties | Value | Unit | Test Standard |
| Tensile modulus (1mm/min) | 3700 | MPa | ISO 527-2/1A | |
| Tensile stress at yield (50mm/min) | 49 | MPa | ISO 527-2/1A | |
| Tensile strain at yield (50mm/min) | 4 | % | ISO 527-2/1A | |
| Flexural modulus (23℃) | 3600 | MPa | ISO 178 | |
| Charpy notched impact strength @ 23℃ | 2.4 | kJ/m² | ISO 179/1eA | |
| Charpy notched impact strength @ -30℃ | 2.2 | kJ/m² | ISO 179/1eA | |
| Notched impact strength (Izod) @ 23℃ | 2.6 | 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 | 105 | ℃ | ISO 75-1/-2 | |
| Coeff.of linear therm. expansion (parallel) | 0.7 | E-4/℃ | ISO 11359-2 | |
| Coeff.of linear therm. expansion (normal) | 0.8 | E-4/℃ | ISO 11359-2 | |
| SpecProd | Test specimen production | Value | Unit | Test Standard |
| Processing conditions acc. ISO | 9988-2 | - | Internal |
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