Celcon® M25

This supplier and product may also be known by these terms: Celcom

Product names can be difficult to match. You may have searched any one of these terms to find this product: Celcon® M25, Celcon M25, Celcon® , Celcon, CelconM25, M 25, M25, Acetal Copolymer, Acetal Copolymer, Acetal (POM) Copolymer, Acetal POM Copolymer, Acetal, pom, Ticona, AcetalPOMCopolymer, 25M

Features may also be described by the following terms: High Molecular Weight, High MW, Good Toughness, Tough, High Impact Resistance.

This plastic material has approval for 15 automotive specifications from the following agencies (the number in parentheses shows the number of specifications for that agency): GM (2), CHRYSLER (2), VALEO (2), DELCO (1), DELCO PROD (1), DELPHI (1), FORD (3), CHEVROLET (3).

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 C (360-390 F). Melt temperature should never exceed 230 C (450 F).

Mold Surface Temperature: Preferred range 82-93 C (180-200 F) especially with wall thickness less than 1.5 mm (0.060 in.). May require mold temperature as high as 120 C (250 F) to reproduce mold surface or to assure minimal molded in stress. Wall thickness greater than 3mm (1/8 in.) may use a cooler (65 C/150 F) mold surface temperature and wall thickness over 6mm (1/4 in.) may use a cold mold surface down to 25 C (80 F). In general, mold surface temperatures lower than 82 C (180 F) 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.

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.

Film Extrusion Melt temperature: 160 to 220°C (320 to 430°F)
Other Extrusion Melt temperature 180 to 220°C (355 to 430°F)
Profile Extrusion Melt temperature: 180 to 220°C (360 to 430°F)
Sheet Extrusion Melt temperature: 180 to 190°C (355 to 375°F)