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℉)

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